Merge pull request 'Workstation basics: fonts, docker-compose, snapd, flatpak, cups, bluetooth, xclip, dmenu (hq to-be 42 phase 2), tools in Go' (#269) from feat/phase-2-workstation-basics-rebased into main

Research 026/04 counted two plain dmenu calls failing with dmenu installed
nowhere. Measured, they are one line on each workstation: dunst's
`dmenu = /usr/bin/dmenu -p dunst:`. Installing the package fixes both by
existing; the line stays the dunst module's.

No claim: node-launcher is not in the controller's seat table yet, and the
module says so. Two Go tools: menu, shaped like that seat's verb (chosen
line, index, typed, cancelled, timed out within 25 s), and session.

modules/anthropic-consumer/Dockerfile

@@ -1,22 +0,0 @@
-# anthropic-consumer's runtime: the tool runtime, carrying this module's compiled code.
-#
-# **Built from this module's own directory and nothing else.** The sdk and the tool runtime are in
-# the base images, published like any other artifact — which is what makes this buildable by the
-# mesh from a repository and a path (novox/hq ADR 0069) rather than only on a workstation that
-# happens to have the siblings.
-#
-# Two bases, named rather than pinned (novox/hq issue 044): the image this is COMPILED in and the
-# image it RUNS in — the second must not carry a compiler. Declared in module.json's `build.on`.
-ARG BUILD_BASE
-ARG RUNTIME_BASE
-
-FROM ${BUILD_BASE} AS build
-WORKDIR /app/modules/anthropic-consumer
-COPY . .
-RUN node /app/node_modules/typescript/bin/tsc apply/index.ts usage/index.ts \
-      --module NodeNext --moduleResolution NodeNext --target ES2022 --outDir dist
-
-FROM ${RUNTIME_BASE}
-COPY --from=build /app/modules/anthropic-consumer/dist /app/modules/anthropic-consumer/dist
-# No serve-time entrypoints: every container of this module names its command (`run` on a
-# schedule), so nothing here serves — deliberately no MESH_TOOL_MODULES.

modules/anthropic-consumer/module.json

@@ -9,29 +9,20 @@
     "model-access"
   ],
   "binds": {
-    "model-access": "/var/lib/anthropic-consumer/model.json"
+    "model-access": "${dir:state}/model.json"
   },
   "secrets": {
-    "model-access": "/var/lib/anthropic-consumer/access-token"
+    "model-access": "${dir:state}/access-token"
-  },
-  "own-secrets": {
-    "broker": "/var/lib/mesh/anthropic-consumer/broker"
   },
   "emits": [
     "usage.session"
   ],
   "resources": [
-    {
-      "id": "mesh-state",
-      "type": "directory",
-      "path": "/var/lib/mesh/anthropic-consumer",
-      "mode": "0700"
-    },
     {
       "id": "state",
       "type": "directory",
-      "path": "/var/lib/anthropic-consumer",
+      "mode": "0700",
-      "mode": "0700"
+      "place": "."
     },
     {
       "id": "claude-home",
@@ -42,71 +33,43 @@
     {
       "id": "out",
       "type": "directory",
-      "path": "/var/lib/anthropic-consumer/out",
       "mode": "0700"
     },
     {
       "id": "apply",
-      "type": "container",
+      "type": "process",
-      "name": "mesh-anthropic-consumer-apply",
+      "name": "anthropic-consumer-apply",
-      "network": "host",
+      "artifact": "code",
+      "run": [
+        "node",
+        "apply/index.js"
+      ],
       "schedule": "*/5 * * * *",
-      "args": [
-        "run",
-        "/app/modules/anthropic-consumer/dist/apply/index.js"
-      ],
-      "volumes": [
-        "/var/lib/anthropic-consumer:/run/state"
-      ],
       "env": {
-        "MESH_MODEL_ACCESS_SECRET_FILE": "/run/state/access-token",
+        "MESH_MODEL_ACCESS_SECRET_FILE": "${dir:state}/access-token",
-        "MESH_MODEL_ACCESS_BIND_FILE": "/run/state/model.json",
+        "MESH_MODEL_ACCESS_BIND_FILE": "${dir:state}/model.json",
-        "MESH_CLAUDE_CREDENTIALS_FILE": "/run/state/claude/.credentials.json",
+        "MESH_CLAUDE_CREDENTIALS_FILE": "${dir:state}/claude/.credentials.json",
-        "MESH_CLAUDE_IDENTITY_FILE": "/run/state/claude/.claude.json"
+        "MESH_CLAUDE_IDENTITY_FILE": "${dir:state}/claude/.claude.json"
-      },
+      }
-      "artifact": "runtime"
-    },
-    {
-      "id": "usage",
-      "type": "container",
-      "name": "mesh-anthropic-consumer-usage",
-      "network": "host",
-      "schedule": "*/5 * * * *",
-      "args": [
-        "run",
-        "/app/modules/anthropic-consumer/dist/usage/index.js"
-      ],
-      "volumes": [
-        "/var/lib/mesh/anthropic-consumer/broker:/run/secrets/broker:ro",
-        "/var/lib/anthropic-consumer:/run/state"
-      ],
-      "env": {
-        "MESH_BROKER_FILE": "/run/secrets/broker",
-        "MESH_CLAUDE_PROJECTS_DIR": "/run/state/claude/projects",
-        "MESH_ANTHROPIC_USAGE_OUT": "/run/state/out/session-usage.json",
-        "MESH_TOOLS_MAIN": "/app/dist/main.js"
-      },
-      "artifact": "runtime"
     }
   ],
   "build": {
-    "on": [
-      {
-        "arg": "BUILD_BASE",
-        "module": "mesh-tools",
-        "artifact": "build"
-      },
-      {
-        "arg": "RUNTIME_BASE",
-        "module": "mesh-tools",
-        "artifact": "runtime"
-      }
-    ],
     "artifacts": [
       {
-        "name": "runtime",
+        "name": "code",
-        "kind": "image",
+        "kind": "bundle",
-        "from": "Dockerfile"
+        "language": "typescript",
+        "entrypoints": [
+          "apply/index.js",
+          "usage/index.js"
+        ],
+        "loads": [
+          "usage/index.js"
+        ],
+        "env": {
+          "MESH_CLAUDE_PROJECTS_DIR": "${dir:state}/claude/projects",
+          "MESH_ANTHROPIC_USAGE_OUT": "${dir:state}/out/session-usage.json"
+        }
       }
     ]
   }

modules/anthropic-consumer/usage/index.ts

@@ -3,12 +3,15 @@
 // per session. The consumer IS the (node,module) session's fixed binding, so no per-message account
 // attribution is done — just the totals (port map "don't-map" #3).
 //
-// Runs as `mesh-tools run` (no broker), so events are emitted best-effort via the sibling mesh-tools
+// Runs in the node's runtime (novox/hq ADR 0198), every five minutes, so events are emitted through
-// `emit` primitive; the totals are also written to a file so the reading is observable without one.
+// the runtime as this module; the totals are also written to a file so the reading is observable
+// without one.
 
 import { readdirSync, statSync, readFileSync, writeFileSync, renameSync, mkdirSync } from "node:fs";
 import { join, dirname } from "node:path";
 
+import { emit } from "@novox/mesh-sdk/events";
+
 import { readSessionFile, type SessionUsage } from "../transcript.js";
 
 /** The vendor-neutral usage row ADR 0054 fixes — the shape the model-usage store upserts. Kept local
@@ -116,22 +119,20 @@ function atomicWrite(path: string, content: string): void {
   renameSync(tmp, path);
 }
 
-/** Emit best-effort via the sibling mesh-tools `emit`, which wires a broker a run step has none. */
+/** Emit best-effort through the runtime: a reading that could not be announced is still in the file. */
 async function emitUsage(body: Record<string, unknown>): Promise<void> {
-  const main = process.env.MESH_TOOLS_MAIN ?? "/app/dist/main.js";
+  try {
-  const { spawn } = await import("node:child_process");
+    await emit("usage.session", body);
-  await new Promise<void>((resolve) => {
+  } catch (err) {
-    const child = spawn(
+    console.error(`[anthropic-consumer] could not emit usage: ${err}`);
-      process.execPath,
+  }
-      [main, "emit", "usage.session", JSON.stringify(body)],
-      { stdio: "inherit" },
-    );
-    child.on("exit", () => resolve());
-    child.on("error", (err) => {
-      console.error(`[anthropic-consumer] could not emit usage: ${err}`);
-      resolve();
-    });
-  });
 }
 
-await main();
+// The cadence the scheduled container had: once at start, then every five minutes. Not awaited, so the
+// runtime's handshake is answered while a long first reading is still under way.
+const EVERY_MS = 5 * 60 * 1000;
+const tick = (): void => {
+  void main().catch((err) => console.error(`[anthropic-consumer] usage reading failed: ${err}`));
+};
+tick();
+setInterval(tick, EVERY_MS);

modules/anthropic-manager/module.json

@@ -9,13 +9,13 @@
     "model-access"
   ],
   "binds": {
-    "model-access": "/var/lib/mesh/anthropic-manager/model.json"
+    "model-access": "${dir:mesh-state}/model.json"
   },
   "secrets": {
-    "model-access": "/var/lib/mesh/anthropic-manager/refresh-token"
+    "model-access": "${dir:mesh-state}/refresh-token"
   },
   "own-secrets": {
-    "broker": "/var/lib/mesh/anthropic-manager/broker"
+    "broker": "${dir:mesh-state}/broker"
   },
   "emits": [
     "usage.read"
@@ -24,13 +24,13 @@
     {
       "id": "mesh-state",
       "type": "directory",
-      "path": "/var/lib/mesh/anthropic-manager",
+      "mode": "0700",
-      "mode": "0700"
+      "place": "mesh"
     },
     {
       "id": "out",
       "type": "directory",
-      "path": "/var/lib/mesh/anthropic-manager/out",
+      "path": "${dir:mesh-state}/out",
       "mode": "0700"
     },
     {
@@ -45,8 +45,8 @@
         "/app/modules/anthropic-manager/dist/refresh/index.js"
       ],
       "volumes": [
-        "/var/lib/mesh/anthropic-manager/broker:/run/secrets/broker:ro",
+        "${dir:mesh-state}/broker:/run/secrets/broker:ro",
-        "/var/lib/mesh/anthropic-manager:/run/state"
+        "${dir:mesh-state}:/run/state"
       ],
       "env": {
         "MESH_BROKER_FILE": "/run/secrets/broker",

modules/audit-logger/Dockerfile

@@ -1,33 +0,0 @@
-# audit-logger's runtime: the shared runtime image, carrying this module's compiled code.
-#
-# **Built from this module's own directory and nothing else.** The toolkit is in the base image, so
-# nothing is copied out of a neighbouring checkout — which is what lets the mesh build this from a
-# repository and a path (novox/hq ADR 0069) rather than only on a workstation that happens to have
-# the siblings laid out beside it.
-
-# Two bases, named rather than pinned: the image this is COMPILED in, and the image it RUNS in.
-# They are different images on purpose — the first carries a compiler and the second must not, or
-# every running container would carry one it never invokes. The mesh answers both with the copies it
-# holds, because a fingerprint written here would name one particular copy and no other mesh has it
-# (novox/hq issue 044). Declared in module.json's `build.on`; deliberately no defaults, so a build
-# nobody told stops here and says which module to build first.
-ARG BUILD_BASE
-ARG RUNTIME_BASE
-
-FROM ${BUILD_BASE} AS build
-# Compiled under /app/modules so `@novox/mesh-sdk` resolves upward into the base's own
-# node_modules — the module is compiled against exactly the toolkit it will run against.
-WORKDIR /app/modules/audit-logger
-COPY . .
-# The compiler is invoked by its real path rather than through node_modules/.bin, whose entries are
-# symlinks to a launcher that requires its library relatively — resolved away when the base image
-# was assembled.
-RUN node /app/node_modules/typescript/bin/tsc audit.ts index.ts \
-      --module NodeNext --moduleResolution NodeNext --target ES2022 --outDir dist
-
-FROM ${RUNTIME_BASE}
-COPY --from=build /app/modules/audit-logger/dist /app/modules/audit-logger/dist
-# **Served, not run.** This subscribes on import, and the serve mode binds the broker before it
-# imports anything — `run` exists for a step that works offline and exits, and would leave this
-# with nothing to subscribe to.
-ENV MESH_TOOL_MODULES=/app/modules/audit-logger/dist/index.js

modules/audit-logger/module.json

@@ -5,27 +5,21 @@
   "consumes": [
     "**"
   ],
-  "own-secrets": {
-    "broker": "/var/lib/audit-logger/broker"
-  },
   "build": {
-    "on": [
-      {
-        "arg": "BUILD_BASE",
-        "module": "mesh-tools",
-        "artifact": "build"
-      },
-      {
-        "arg": "RUNTIME_BASE",
-        "module": "mesh-tools",
-        "artifact": "runtime"
-      }
-    ],
     "artifacts": [
       {
-        "name": "runtime",
+        "name": "code",
-        "kind": "image",
+        "kind": "bundle",
-        "from": "Dockerfile"
+        "language": "typescript",
+        "entrypoints": [
+          "index.js"
+        ],
+        "loads": [
+          "index.js"
+        ],
+        "env": {
+          "AUDIT_LOG": "${dir:trail}/audit.log"
+        }
       }
     ]
   },
@@ -33,29 +27,13 @@
     {
       "id": "state",
       "type": "directory",
-      "path": "/var/lib/audit-logger",
+      "mode": "0700",
-      "mode": "0700"
+      "place": "."
     },
     {
       "id": "trail",
       "type": "directory",
-      "path": "/var/lib/audit-logger/trail",
       "mode": "0700"
-    },
-    {
-      "id": "run",
-      "type": "container",
-      "name": "mesh-audit-logger",
-      "network": "host",
-      "volumes": [
-        "/var/lib/audit-logger/broker:/run/secrets/broker:ro",
-        "/var/lib/audit-logger/trail:/trail"
-      ],
-      "env": {
-        "MESH_BROKER_FILE": "/run/secrets/broker",
-        "AUDIT_LOG": "/trail/audit.log"
-      },
-      "artifact": "runtime"
     }
   ],
   "capabilities": [

modules/audit-logger/test/audit.test.ts

@@ -15,7 +15,7 @@ test("audit-logger records every event to the trail as one line each", async ()
   const path = join(dir, "audit.log");
 
   // The audit-logger's whole behaviour: consume everything, record it.
-  await on("**", async (event) => record(event, path));
+  await on("#", async (event) => record(event, path)); // the pattern index.ts subscribes
 
   process.env.MESH_MODULE = "umami";
   process.env.MESH_NODE = "anchor";
@@ -24,7 +24,9 @@ test("audit-logger records every event to the trail as one line each", async ()
 
   const lines = (await readFile(path, "utf8")).trim().split("\n").map((l) => JSON.parse(l));
   assert.equal(lines.length, 2);
-  assert.deepEqual(lines.map((l) => l.type), ["umami.site.created", "node.anchor.joined"]);
+  // A module names its events locally (design 29); the module is the `source`, which together with
+  // the type says whose event it was. This broker does no namespacing, so the type is as emitted.
+  assert.deepEqual(lines.map((l) => l.type), ["site.created", "node.anchor.joined"]);
   assert.equal(lines[0].source, "umami");
   assert.equal(lines[0].node, "anchor");
   assert.equal(lines[0].body.domain, "my-app");

modules/avahi/README.md

@@ -0,0 +1,42 @@
+# avahi
+
+The local network's name and service discovery (mDNS/DNS-SD) as a module (novox/hq to-be 42 Phase 1,
+research 027).
+
+## What it owns
+
+- The `avahi` package.
+- `avahi-daemon.service`, running and enabled.
+
+## What it improves
+
+It was on all four machines and owned by none. It is now declared, and its tools show why discovery
+does not work today:
+
+- **The packet filter drops mDNS.** The mesh's filter has no rule for inbound UDP 5353 on any of the
+  four machines, so avahi announces this machine but hears no other machine's answers. A browse
+  finds nothing, and resolving even the machine's own `.local` name times out. A module's `listens`
+  can reach the private network, this machine or anywhere, but not the local link. Opening the port
+  to anywhere would answer the internet on a public machine, so the module opens nothing. This needs
+  a decision in novox/hq: a local-link source scope for `listens`. Until then, `avahi_status` reports
+  `inbound_mdns_accepted: false`, and browse and resolve say so whenever they hear nothing.
+
+## What it leaves found
+
+- **`nss-mdns` and `/etc/nsswitch.conf`.** An ordinary lookup reaches avahi only through the
+  `hosts:` line. That line is one ordered list shared by every name source: containers, files, DNS,
+  mDNS and the resolver daemon. The host can write a marked block into a file, but it cannot add a
+  member to a line. Owning the whole file would make this module the owner of every machine's name
+  resolution. On 2026-10-04 all four machines had the same file, with `mdns4_minimal` wired by hand
+  and nss-mdns installed. Both are left as found, and `avahi_status` reports the wiring.
+- `/etc/avahi/avahi-daemon.conf`, including each workstation's hand-set `allow-interfaces`, which
+  names that machine's own network interface.
+
+## Tools
+
+| tool | | answers |
+|---|---|---|
+| `avahi_status` | r | the daemon, its version and configuration, the `hosts:` line and whether mdns is on it, nss-mdns, whether the filter accepts inbound 5353, systemd-resolved beside it, and notes |
+| `avahi_browse` | r | every service announced in a few seconds (`avahi-browse -prt`), resolved where possible, narrowed to a type |
+| `avahi_resolve` | r | a `.local` name through avahi and through the name service side by side, or an address to its name |
+| `avahi_services` | r | what this machine publishes from `/etc/avahi/services` |

modules/avahi/cmd/avahi-tools/avahi.go

@@ -0,0 +1,353 @@
+package main
+
+// Avahi, the local network's name and service discovery (mDNS/DNS-SD), as a module (novox/hq to-be 42
+// Phase 1, research 027: "on all four, owned by none"). The module declares the package and the
+// daemon. Two things it does not declare, and these tools report instead:
+//
+//   - **The name service switch.** nss-mdns is what lets an ordinary lookup answer `<host>.local`, and
+//     it works only through the `hosts:` line of /etc/nsswitch.conf. That line is one ordered list
+//     shared by every name source on the machine (containers, files, DNS, mDNS, the resolver daemon),
+//     the host can write a marked block into a file but not a member into a line, and owning the whole
+//     file would make this module the owner of every machine's name resolution. So both stay as found
+//     (wired by hand, identically, on all four machines on 2026-10-04) and `avahi_status` says whether
+//     the wiring is there.
+//   - **The packet filter.** mDNS is multicast to UDP 5353 on the local link. The mesh's filter has no
+//     source scope for "the local link" — a module's `listens` reach the private network, this machine
+//     or anywhere — so it drops what other machines announce, and a browse hears nothing. Opening it to
+//     anywhere would answer the internet on a public machine. `avahi_status` reports whether inbound
+//     5353 is accepted; browse and resolve say so when they hear nothing.
+
+import (
+	"fmt"
+	"net"
+	"regexp"
+	"sort"
+	"strconv"
+	"strings"
+)
+
+// The files avahi and the name service read.
+const (
+	DaemonConf  = "/etc/avahi/avahi-daemon.conf"
+	ServicesDir = "/etc/avahi/services"
+	NSSwitch    = "/etc/nsswitch.conf"
+	Daemon      = "avahi-daemon.service"
+)
+
+// Status is the daemon, its configuration, the name service's wiring and the filter.
+type Status struct {
+	Daemon      map[string]string            `json:"daemon"`
+	Version     string                       `json:"version,omitempty"`
+	Config      map[string]map[string]string `json:"config"`
+	HostsLine   string                       `json:"nsswitch_hosts"`
+	MDNSWired   bool                         `json:"nss_mdns_wired"`
+	NSSMDNS     string                       `json:"nss_mdns_package,omitempty"`
+	InboundMDNS *bool                        `json:"inbound_mdns_accepted"`
+	FilterError string                       `json:"filter_error,omitempty"`
+	ResolvedOn  bool                         `json:"systemd_resolved_active"`
+	Notes       []string                     `json:"notes"`
+}
+
+// ParseINI reads avahi-daemon.conf's sections and their set keys; commented keys are defaults.
+func ParseINI(text string) map[string]map[string]string {
+	out := map[string]map[string]string{}
+	section := ""
+	for _, l := range lines(text) {
+		l = strings.TrimSpace(l)
+		switch {
+		case strings.HasPrefix(l, "#") || strings.HasPrefix(l, ";"):
+		case strings.HasPrefix(l, "[") && strings.HasSuffix(l, "]"):
+			section = strings.Trim(l, "[]")
+			out[section] = map[string]string{}
+		default:
+			if k, v, ok := strings.Cut(l, "="); ok && section != "" {
+				out[section][strings.TrimSpace(k)] = strings.TrimSpace(v)
+			}
+		}
+	}
+	return out
+}
+
+// HostsLine is the `hosts:` line of nsswitch.conf, and whether an mdns source is on it.
+func HostsLine(text string) (string, bool) {
+	for _, l := range lines(text) {
+		l = strings.TrimSpace(l)
+		if !strings.HasPrefix(l, "hosts:") {
+			continue
+		}
+		for _, f := range strings.Fields(strings.TrimPrefix(l, "hosts:")) {
+			if strings.HasPrefix(f, "mdns") {
+				return l, true
+			}
+		}
+		return l, false
+	}
+	return "", false
+}
+
+var mdnsAccept = regexp.MustCompile(`(?m)\budp dport (?:\{[^}\n]*\b(?:5353|mdns)\b[^}\n]*\}|(?:5353|mdns)\b)[^\n]*\baccept\b`)
+
+// InboundMDNS is whether a ruleset accepts UDP 5353 coming in.
+func InboundMDNS(ruleset string) bool { return mdnsAccept.MatchString(ruleset) }
+
+// GetStatus reads the daemon, its configuration, the name service and the packet filter.
+func (m *Machine) GetStatus() (Status, error) {
+	s := Status{Config: map[string]map[string]string{}, Notes: []string{}}
+	d, err := m.unitProps(Daemon, "LoadState", "ActiveState", "SubState", "UnitFileState", "MainPID")
+	if err != nil {
+		return s, err
+	}
+	s.Daemon = d
+	if v, err := m.Out("avahi-daemon", "--version"); err == nil {
+		s.Version = strings.TrimSpace(v)
+	}
+	if text, err := m.ReadFile(DaemonConf); err == nil {
+		s.Config = ParseINI(string(text))
+	}
+	if text, err := m.ReadFile(NSSwitch); err == nil {
+		s.HostsLine, s.MDNSWired = HostsLine(string(text))
+	}
+	if r := m.Run(bg(), "pacman", "-Q", "nss-mdns"); r.Status == 0 && r.Err == "" {
+		s.NSSMDNS = strings.TrimSpace(r.Stdout)
+	}
+	if rs, err := m.Root("nft", "list", "ruleset"); err == nil {
+		open := InboundMDNS(rs)
+		s.InboundMDNS = &open
+		if !open {
+			s.Notes = append(s.Notes, "the packet filter drops inbound UDP 5353: this machine announces itself but hears no other machine's mDNS")
+		}
+	} else {
+		s.FilterError = err.Error()
+	}
+	if p, err := m.unitProps("systemd-resolved.service", "ActiveState"); err == nil {
+		s.ResolvedOn = p["ActiveState"] == "active"
+	}
+	if s.MDNSWired && s.NSSMDNS == "" {
+		s.Notes = append(s.Notes, "nsswitch names mdns and nss-mdns is not installed: those lookups fail")
+	}
+	if !s.MDNSWired {
+		s.Notes = append(s.Notes, "nsswitch does not name mdns: ordinary lookups never ask avahi")
+	}
+	return s, nil
+}
+
+// Service is one service a browse found.
+type Service struct {
+	Interface string   `json:"interface"`
+	Protocol  string   `json:"protocol"`
+	Name      string   `json:"name"`
+	Type      string   `json:"type"`
+	Domain    string   `json:"domain"`
+	Host      string   `json:"host,omitempty"`
+	Address   string   `json:"address,omitempty"`
+	Port      int      `json:"port,omitempty"`
+	TXT       []string `json:"txt,omitempty"`
+	Resolved  bool     `json:"resolved"`
+}
+
+// unescape undoes avahi-browse -p's escaping: a special byte as a backslash and three decimals, any
+// other character after a backslash as itself. Decoded as bytes, so a name in UTF-8 stays whole.
+func unescape(s string) string {
+	out := make([]byte, 0, len(s))
+	for i := 0; i < len(s); i++ {
+		if s[i] == '\\' {
+			if d := s[i+1 : min(i+4, len(s))]; len(d) == 3 && isDigits(d) {
+				n, _ := strconv.Atoi(d)
+				out = append(out, byte(n))
+				i += 3
+				continue
+			}
+			if i+1 < len(s) {
+				out = append(out, s[i+1])
+				i++
+				continue
+			}
+		}
+		out = append(out, s[i])
+	}
+	return string(out)
+}
+
+func isDigits(s string) bool {
+	for _, c := range s {
+		if c < '0' || c > '9' {
+			return false
+		}
+	}
+	return true
+}
+
+var txtItem = regexp.MustCompile(`"((?:[^"\\]|\\.)*)"`)
+
+// ParseBrowse reads `avahi-browse -p -r`: `+` lines found, `=` lines resolved; a found service
+// that resolved is answered once, resolved.
+func ParseBrowse(out string) []Service {
+	byKey := map[string]int{}
+	services := []Service{}
+	for _, l := range lines(out) {
+		f := strings.Split(l, ";")
+		if len(f) < 6 || (f[0] != "+" && f[0] != "=") {
+			continue
+		}
+		s := Service{Interface: f[1], Protocol: f[2], Name: unescape(f[3]), Type: f[4], Domain: f[5]}
+		if f[0] == "=" && len(f) >= 9 {
+			s.Resolved, s.Host, s.Address = true, f[6], f[7]
+			s.Port, _ = strconv.Atoi(f[8])
+			if len(f) >= 10 {
+				for _, t := range txtItem.FindAllStringSubmatch(strings.Join(f[9:], ";"), -1) {
+					s.TXT = append(s.TXT, t[1])
+				}
+			}
+		}
+		key := strings.Join([]string{s.Interface, s.Protocol, s.Name, s.Type, s.Domain}, "\x00")
+		if i, seen := byKey[key]; seen {
+			if s.Resolved {
+				services[i] = s
+			}
+			continue
+		}
+		byKey[key] = len(services)
+		services = append(services, s)
+	}
+	sort.SliceStable(services, func(i, j int) bool {
+		if services[i].Type != services[j].Type {
+			return services[i].Type < services[j].Type
+		}
+		return services[i].Name < services[j].Name
+	})
+	return services
+}
+
+var serviceType = regexp.MustCompile(`^_[A-Za-z0-9-]+\._(tcp|udp)$`)
+
+// Browse listens for a few seconds and answers every service announced, resolved where it could be.
+func (m *Machine) Browse(seconds int, kind string) (map[string]any, error) {
+	args := []string{strconv.Itoa(seconds), "avahi-browse", "-p", "-r", "-t"}
+	if kind == "" {
+		args = append(args, "-a")
+	} else {
+		if !serviceType.MatchString(kind) {
+			return nil, fmt.Errorf("%q is not a service type such as _ssh._tcp", kind)
+		}
+		args = append(args, kind)
+	}
+	r := m.Run(bg(), "timeout", args...)
+	// timeout's 124 is the listening time ending, which is how a browse that keeps hearing ends.
+	if r.Err != "" || (r.Status != 0 && r.Status != 124) {
+		return nil, failure("avahi-browse", "avahi-browse", r)
+	}
+	services := ParseBrowse(r.Stdout)
+	out := map[string]any{"seconds": seconds, "count": len(services), "services": services}
+	if len(services) == 0 {
+		out["note"] = m.silenceNote()
+	}
+	return out, nil
+}
+
+// silenceNote says why nothing may have been heard, from the packet filter when it can be read.
+func (m *Machine) silenceNote() string {
+	if rs, err := m.Root("nft", "list", "ruleset"); err == nil && !InboundMDNS(rs) {
+		return "nothing was heard, and this machine's packet filter drops inbound UDP 5353 (mDNS): other machines' answers do not reach avahi"
+	}
+	return "nothing was heard on the local network"
+}
+
+// Resolve asks avahi for a name's address (or an address's name), and the name service the same,
+// so an answer avahi has and an ordinary lookup does not shows the switch unwired.
+func (m *Machine) Resolve(name, address string) (map[string]any, error) {
+	if (name == "") == (address == "") {
+		return nil, fmt.Errorf("give a name or an address")
+	}
+	out := map[string]any{}
+	var r Ran
+	if name != "" {
+		if !strings.HasSuffix(name, ".local") {
+			name += ".local"
+		}
+		out["name"] = name
+		r = m.Run(bg(), "avahi-resolve", "-n", name)
+	} else {
+		if net.ParseIP(address) == nil {
+			return nil, fmt.Errorf("%q is not an address", address)
+		}
+		out["address"] = address
+		r = m.Run(bg(), "avahi-resolve", "-a", address)
+	}
+	if r.Err != "" {
+		return nil, failure("avahi-resolve", "avahi-resolve", r)
+	}
+	// avahi-resolve says a failure on stderr and exits 0.
+	avahi := map[string]any{"answers": []string{}}
+	for _, l := range lines(r.Stdout) {
+		if f := strings.Fields(l); len(f) >= 2 {
+			avahi["answers"] = append(avahi["answers"].([]string), f[1])
+		}
+	}
+	if said := firstLine(r.Stderr); said != "" {
+		avahi["error"] = said
+	}
+	avahi["resolved"] = len(avahi["answers"].([]string)) > 0
+	out["avahi"] = avahi
+	if name != "" {
+		nss := map[string]any{"answers": []string{}}
+		g := m.Run(bg(), "getent", "hosts", name)
+		for _, l := range lines(g.Stdout) {
+			if f := strings.Fields(l); len(f) >= 1 {
+				nss["answers"] = append(nss["answers"].([]string), f[0])
+			}
+		}
+		nss["resolved"] = len(nss["answers"].([]string)) > 0
+		out["name_service"] = nss
+	}
+	if avahi["resolved"] == false {
+		out["note"] = m.silenceNote()
+	}
+	return out, nil
+}
+
+// Published is one service this machine announces from a file of /etc/avahi/services.
+type Published struct {
+	File  string   `json:"file"`
+	Name  string   `json:"name,omitempty"`
+	Types []string `json:"types"`
+	Ports []int    `json:"ports"`
+}
+
+var (
+	xmlName = regexp.MustCompile(`<name[^>]*>([^<]*)</name>`)
+	xmlType = regexp.MustCompile(`<type>([^<]*)</type>`)
+	xmlPort = regexp.MustCompile(`<port>(\d+)</port>`)
+)
+
+// Services is what this machine publishes from its service files.
+func (m *Machine) Services() (map[string]any, error) {
+	r := m.Run(bg(), "find", ServicesDir, "-mindepth", "1", "-maxdepth", "1", "-name", "*.service", "-printf", "%f\n")
+	if r.Err != "" || r.Status != 0 {
+		if strings.Contains(r.Stderr, "No such file") {
+			return map[string]any{"directory": ServicesDir, "published": []Published{}}, nil
+		}
+		return nil, failure("find", "find", r)
+	}
+	pub := []Published{}
+	names := lines(r.Stdout)
+	sort.Strings(names)
+	for _, n := range names {
+		text, err := m.ReadFile(ServicesDir + "/" + n)
+		if err != nil {
+			return nil, err
+		}
+		p := Published{File: n, Types: []string{}, Ports: []int{}}
+		if x := xmlName.FindStringSubmatch(string(text)); x != nil {
+			p.Name = x[1]
+		}
+		for _, t := range xmlType.FindAllStringSubmatch(string(text), -1) {
+			p.Types = append(p.Types, t[1])
+		}
+		for _, x := range xmlPort.FindAllStringSubmatch(string(text), -1) {
+			port, _ := strconv.Atoi(x[1])
+			p.Ports = append(p.Ports, port)
+		}
+		pub = append(pub, p)
+	}
+	return map[string]any{"directory": ServicesDir, "published": pub}, nil
+}

modules/avahi/cmd/avahi-tools/avahi_test.go

@@ -0,0 +1,165 @@
+package main
+
+import (
+	"strings"
+	"testing"
+)
+
+const browse = `+;enp6s0;IPv4;home\032server;_ssh._tcp;local
++;enp6s0;IPv4;Printer\046Co;_ipp._tcp;local
+=;enp6s0;IPv4;home\032server;_ssh._tcp;local;home-server.local;192.168.1.10;22;
+=;enp6s0;IPv4;Printer\046Co;_ipp._tcp;local;printer.local;192.168.1.20;631;"txtvers=1" "rp=ipp/print"
++;enp6s0;IPv6;Kitchen;_spotify-connect._tcp;local
+`
+
+func TestABrowseIsReadResolvedOnceAndUnescaped(t *testing.T) {
+	s := ParseBrowse(browse)
+	if len(s) != 3 {
+		t.Fatalf("%+v", s)
+	}
+	by := map[string]Service{}
+	for _, x := range s {
+		by[x.Name] = x
+	}
+	ssh := by["home server"]
+	if !ssh.Resolved || ssh.Address != "192.168.1.10" || ssh.Port != 22 || ssh.Host != "home-server.local" {
+		t.Fatalf("%+v", ssh)
+	}
+	ipp := by["Printer.Co"]
+	if strings.Join(ipp.TXT, ",") != "txtvers=1,rp=ipp/print" {
+		t.Fatalf("%+v", ipp)
+	}
+	if k := by["Kitchen"]; k.Resolved || k.Type != "_spotify-connect._tcp" {
+		t.Fatalf("%+v", k)
+	}
+	if unescape(`caf\195\169`) != "café" || unescape(`a\.b`) != "a.b" {
+		t.Fatal("unescape")
+	}
+}
+
+func TestABrowseThatHearsNothingSaysTheFilterDropsMDNS(t *testing.T) {
+	var calls []call
+	m := machine(fake(func(c call) Ran {
+		switch c.String() {
+		case "timeout 5 avahi-browse -p -r -t -a":
+			return Ran{Status: 124}
+		case "sudo -n nft list ruleset":
+			return Ran{Stdout: "table inet mesh {\n chain input {\n type filter hook input priority filter; policy drop;\n tcp dport 22 accept\n }\n}\n"}
+		}
+		return Ran{Status: 99}
+	}, &calls), 1000)
+	r, err := m.Browse(5, "")
+	if err != nil || r["count"] != 0 || !strings.Contains(r["note"].(string), "drops inbound UDP 5353") {
+		t.Fatalf("%v %v", r, err)
+	}
+	if _, err := m.Browse(5, "ssh; rm"); err == nil {
+		t.Fatal("not a service type")
+	}
+}
+
+func TestTheFilterIsReadForAnAcceptedInboundMDNS(t *testing.T) {
+	for rs, want := range map[string]bool{
+		"\t\tudp dport 5353 accept\n":                            true,
+		"\t\tiifname \"enp6s0\" udp dport { 53, 5353 } accept\n": true,
+		"\t\tudp dport mdns accept\n":                            true,
+		"\t\tudp dport 53 accept\n":                              false,
+		"\t\tudp dport 5353 drop\n":                              false,
+		"\t\tip saddr 10.0.0.0/8 udp dport 15353 accept\n":       false,
+	} {
+		if InboundMDNS(rs) != want {
+			t.Errorf("%q: %v", rs, !want)
+		}
+	}
+}
+
+func TestStatusNamesTheSwitchTheFilterAndTheDaemon(t *testing.T) {
+	m := machine(fake(func(c call) Ran {
+		switch {
+		case c.name == "systemctl" && c.args[1] == Daemon:
+			return Ran{Stdout: "LoadState=loaded\nActiveState=active\nUnitFileState=enabled\n"}
+		case c.name == "systemctl":
+			return Ran{Stdout: "ActiveState=inactive\n"}
+		case c.String() == "avahi-daemon --version":
+			return Ran{Stdout: "avahi-daemon 0.9-rc5\n"}
+		case c.String() == "pacman -Q nss-mdns":
+			return Ran{Stdout: "nss-mdns 0.15.1-2\n"}
+		case c.String() == "sudo -n nft list ruleset":
+			return Ran{Stdout: "udp dport 53 accept\n"}
+		}
+		return Ran{Status: 99}
+	}, nil), 1000)
+	files := map[string]string{
+		DaemonConf: "[server]\nuse-ipv4=yes\n#host-name=foo\nallow-interfaces=enp6s0\n[publish]\npublish-hinfo=no\n",
+		NSSwitch:   "passwd: files\nhosts: mymachines files dns mdns4_minimal [NOTFOUND=return] resolve [!UNAVAIL=return]\n",
+	}
+	m.ReadFile = func(p string) ([]byte, error) {
+		if s, ok := files[p]; ok {
+			return []byte(s), nil
+		}
+		return nil, errNoFile
+	}
+	s, err := m.GetStatus()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !s.MDNSWired || s.NSSMDNS != "nss-mdns 0.15.1-2" || s.InboundMDNS == nil || *s.InboundMDNS || s.Version != "avahi-daemon 0.9-rc5" {
+		t.Fatalf("%+v", s)
+	}
+	if s.Config["server"]["allow-interfaces"] != "enp6s0" || s.Config["server"]["host-name"] != "" || s.Daemon["ActiveState"] != "active" {
+		t.Fatalf("%+v", s.Config)
+	}
+	if len(s.Notes) != 1 || !strings.Contains(s.Notes[0], "drops inbound UDP 5353") {
+		t.Fatalf("%v", s.Notes)
+	}
+	if _, wired := HostsLine("hosts: files dns\n"); wired {
+		t.Fatal("no mdns on the line")
+	}
+}
+
+func TestResolveAsksAvahiAndTheNameServiceAndReadsAFailureFromStderr(t *testing.T) {
+	m := machine(byLine(map[string]Ran{
+		"avahi-resolve -n printer.local": {Stdout: "printer.local\t192.168.1.20\n"},
+		"getent hosts printer.local":     {Status: 2},
+		"avahi-resolve -n nowhere.local": {Stderr: "Failed to resolve host name 'nowhere.local': Timeout reached\n"},
+		"getent hosts nowhere.local":     {Status: 2},
+		"sudo -n nft list ruleset":       {Stdout: "udp dport 5353 accept\n"},
+		"avahi-resolve -a 192.168.1.20":  {Stdout: "192.168.1.20\tprinter.local\n"},
+	}, nil), 1000)
+	r, err := m.Resolve("printer", "")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if r["avahi"].(map[string]any)["resolved"] != true || r["name_service"].(map[string]any)["resolved"] != false {
+		t.Fatalf("%v", r)
+	}
+	r, _ = m.Resolve("nowhere.local", "")
+	if a := r["avahi"].(map[string]any); a["resolved"] != false || !strings.Contains(a["error"].(string), "Timeout reached") || r["note"] != "nothing was heard on the local network" {
+		t.Fatalf("%v", r)
+	}
+	r, _ = m.Resolve("", "192.168.1.20")
+	if r["avahi"].(map[string]any)["answers"].([]string)[0] != "printer.local" {
+		t.Fatalf("%v", r)
+	}
+	for _, bad := range [][2]string{{"", ""}, {"a", "1.2.3.4"}, {"", "not-an-ip"}} {
+		if _, err := m.Resolve(bad[0], bad[1]); err == nil {
+			t.Errorf("%v accepted", bad)
+		}
+	}
+}
+
+func TestPublishedServicesAreReadFromTheirFiles(t *testing.T) {
+	m := machine(byLine(map[string]Ran{
+		"find /etc/avahi/services -mindepth 1 -maxdepth 1 -name *.service -printf %f\n": {Stdout: "ssh.service\n"},
+	}, nil), 1000)
+	m.ReadFile = func(string) ([]byte, error) {
+		return []byte(`<service-group><name replace-wildcards="yes">%h</name><service><type>_ssh._tcp</type><port>22</port></service></service-group>`), nil
+	}
+	r, err := m.Services()
+	if err != nil {
+		t.Fatal(err)
+	}
+	p := r["published"].([]Published)
+	if len(p) != 1 || p[0].Name != "%h" || p[0].Types[0] != "_ssh._tcp" || p[0].Ports[0] != 22 {
+		t.Fatalf("%+v", p)
+	}
+}

modules/avahi/cmd/avahi-tools/machine.go

@@ -0,0 +1,289 @@
+package main
+
+// The commands this bundle runs on its machine, and who runs them.
+//
+// Who asks. The node's tool runtime runs as the operator account, not root (novox/hq ADR 0175 §4),
+// and launches this binary as a process of its own (ADR 0188, ADR 0193) with the runtime's words —
+// HOME, a PATH, MESH_OPERATOR_ACCOUNT — and no session words. Reading needs nothing more; what only
+// root may do goes through `sudo -n`, as the packet filter's, the service manager's and the
+// intrusion prevention's tools do (to-be 38 WP4), and the `sudo` module is what declares that the
+// account may (to-be 42, research 027). A refusal is named by how it failed, never read as an
+// empty answer.
+//
+// The runner is injected, so every tool is tested over a fake one without the machine.
+
+import (
+	"bytes"
+	"context"
+	"errors"
+	"fmt"
+	"io/fs"
+	"os"
+	"os/exec"
+	"strings"
+	"time"
+)
+
+// Ran is what one command did: its output, its exit status, and why it never ran to an answer.
+type Ran struct {
+	Stdout string
+	Stderr string
+	Status int
+	// Err is "ENOENT" when the program is not there, or that it was ended for taking too long.
+	Err string
+}
+
+// Runner runs one command, so the tools can be tested without the machine.
+type Runner func(ctx context.Context, name string, args ...string) Ran
+
+// CallTimeout is how long one command may take: below the runtime's thirty-second call limit, so a
+// command that hangs is answered as such rather than as a call the runtime gave up on.
+const CallTimeout = 20 * time.Second
+
+// outputLimit bounds what one command may hand back, so a runaway listing cannot exhaust the
+// process; well above anything a tool answers.
+const outputLimit = 16 << 20
+
+type bounded struct {
+	bytes.Buffer
+	cut bool
+}
+
+func (b *bounded) Write(p []byte) (int, error) {
+	if room := outputLimit - b.Len(); room < len(p) {
+		if room > 0 {
+			b.Buffer.Write(p[:room])
+		}
+		b.cut = true
+		return len(p), nil
+	}
+	return b.Buffer.Write(p)
+}
+
+// ExecRunner runs a command on this machine, in the C locale so what is parsed is one language.
+func ExecRunner(ctx context.Context, name string, args ...string) Ran {
+	ctx, cancel := context.WithTimeout(ctx, CallTimeout)
+	defer cancel()
+	cmd := exec.CommandContext(ctx, name, args...)
+	cmd.Env = append(os.Environ(), "LC_ALL=C")
+	var out, errb bounded
+	cmd.Stdout, cmd.Stderr = &out, &errb
+	err := cmd.Run()
+	r := Ran{Stdout: out.String(), Stderr: errb.String()}
+	if ctx.Err() == context.DeadlineExceeded {
+		r.Status, r.Err = 124, fmt.Sprintf("no answer within %d s", int(CallTimeout.Seconds()))
+		return r
+	}
+	var exit *exec.ExitError
+	switch {
+	case err == nil:
+	case errors.As(err, &exit):
+		r.Status = exit.ExitCode()
+	case errors.Is(err, exec.ErrNotFound) || errors.Is(err, fs.ErrNotExist):
+		r.Status, r.Err = 127, "ENOENT"
+	default:
+		r.Status, r.Err = 126, err.Error()
+	}
+	return r
+}
+
+// Escalated is the command as it is run: as given when this process is root, else through sudo
+// without a prompt.
+func Escalated(uid int, name string, args ...string) (string, []string) {
+	if uid == 0 {
+		return name, args
+	}
+	return "sudo", append([]string{"-n", name}, args...)
+}
+
+// Machine is this machine as the tools see it: a runner, who this process is, and its files.
+type Machine struct {
+	Run      Runner
+	UID      int
+	User     string
+	Account  string
+	ReadFile func(path string) ([]byte, error)
+	Now      func() time.Time
+	Sleep    func(time.Duration)
+}
+
+// ThisMachine is the machine the runtime launched this bundle on.
+func ThisMachine() *Machine {
+	user := os.Getenv("USER")
+	if user == "" {
+		user = os.Getenv("LOGNAME")
+	}
+	account := strings.TrimSpace(os.Getenv("MESH_OPERATOR_ACCOUNT"))
+	if account == "" {
+		account = user
+	}
+	return &Machine{Run: ExecRunner, UID: os.Getuid(), User: user, Account: account, ReadFile: os.ReadFile, Now: time.Now, Sleep: time.Sleep}
+}
+
+// Out runs a command that only reads, and fails with what went wrong named.
+func (m *Machine) Out(name string, args ...string) (string, error) {
+	r := m.Run(context.Background(), name, args...)
+	if r.Status == 0 && r.Err == "" {
+		return r.Stdout, nil
+	}
+	return r.Stdout, failure(name, name, r)
+}
+
+// Root runs a command that needs root, escalated when this process is not.
+func (m *Machine) Root(name string, args ...string) (string, error) {
+	program, argv := Escalated(m.UID, name, args...)
+	r := m.Run(context.Background(), program, argv...)
+	if r.Status == 0 && r.Err == "" {
+		return r.Stdout, nil
+	}
+	return r.Stdout, failure(name, program, r)
+}
+
+// RootRan is Root's raw answer, for a command whose non-zero status is itself an answer.
+func (m *Machine) RootRan(name string, args ...string) (Ran, error) {
+	program, argv := Escalated(m.UID, name, args...)
+	r := m.Run(context.Background(), program, argv...)
+	if r.Err != "" || (program == "sudo" && sudoRefused(r)) {
+		return r, failure(name, program, r)
+	}
+	return r, nil
+}
+
+func sudoRefused(r Ran) bool {
+	return strings.HasPrefix(strings.TrimSpace(r.Stderr), "sudo:")
+}
+
+// failure names what failed by how it failed: the program missing is a spawn error, sudo missing
+// or refusing speaks for itself, and the rest is the command's own first line.
+func failure(cmd, program string, r Ran) error {
+	said := strings.TrimSpace(r.Stderr + "\n" + r.Stdout)
+	if r.Err == "ENOENT" {
+		if program == "sudo" {
+			return fmt.Errorf("%s needs root for this, and sudo is not installed here for the runtime's account to escalate with", cmd)
+		}
+		return fmt.Errorf("%s is not installed on this machine", cmd)
+	}
+	if r.Err != "" {
+		return fmt.Errorf("%s did not answer: %s", cmd, r.Err)
+	}
+	if program == "sudo" && sudoRefused(r) {
+		if strings.Contains(said, "command not found") {
+			return fmt.Errorf("%s is not installed on this machine", cmd)
+		}
+		return fmt.Errorf("%s needs root for this and the runtime's account may not run it without a prompt: %s", cmd, firstLine(said))
+	}
+	if line := firstLine(said); line != "" {
+		return fmt.Errorf("%s failed (%d): %s", cmd, r.Status, line)
+	}
+	return fmt.Errorf("%s failed with status %d", cmd, r.Status)
+}
+
+func firstLine(text string) string {
+	for _, l := range strings.Split(text, "\n") {
+		if l = strings.TrimSpace(l); l != "" {
+			return l
+		}
+	}
+	return ""
+}
+
+func lines(text string) []string {
+	var out []string
+	for _, l := range strings.Split(text, "\n") {
+		if l = strings.TrimRight(l, "\r"); strings.TrimSpace(l) != "" {
+			out = append(out, l)
+		}
+	}
+	return out
+}
+
+// text is a string argument; required says whether it may be absent. It is never something a
+// command would read as an option, which under sudo would be root's option.
+func text(args map[string]any, key string, required bool) (string, error) {
+	raw, present := args[key]
+	if !present || raw == nil {
+		if required {
+			return "", fmt.Errorf("%s is required", key)
+		}
+		return "", nil
+	}
+	s, ok := raw.(string)
+	if !ok {
+		return "", fmt.Errorf("%s must be a string", key)
+	}
+	s = strings.TrimSpace(s)
+	if required && s == "" {
+		return "", fmt.Errorf("%s is required", key)
+	}
+	if strings.HasPrefix(s, "-") || strings.ContainsRune(s, 0) || strings.ContainsAny(s, "\n\r") {
+		return "", fmt.Errorf("%s %q is not a value this tool passes on", key, s)
+	}
+	return s, nil
+}
+
+// whole is a whole-number argument with a default, kept within bounds.
+func whole(args map[string]any, key string, def, least, most int) (int, error) {
+	raw, present := args[key]
+	if !present || raw == nil {
+		return def, nil
+	}
+	f, ok := raw.(float64)
+	if !ok || f != float64(int(f)) {
+		return 0, fmt.Errorf("%s must be a whole number", key)
+	}
+	n := int(f)
+	if n < least {
+		return 0, fmt.Errorf("%s must be at least %d", key, least)
+	}
+	if n > most {
+		n = most
+	}
+	return n, nil
+}
+
+// flag is a boolean argument, false when absent.
+func flag(args map[string]any, key string) (bool, error) {
+	raw, present := args[key]
+	if !present || raw == nil {
+		return false, nil
+	}
+	b, ok := raw.(bool)
+	if !ok {
+		return false, fmt.Errorf("%s must be true or false", key)
+	}
+	return b, nil
+}
+
+// schema is a tool's input: its properties and the ones it requires.
+func schema(properties map[string]any, required ...string) map[string]any {
+	s := map[string]any{"type": "object", "properties": properties}
+	if len(required) > 0 {
+		s["required"] = required
+	}
+	return s
+}
+
+// unitProps reads a unit's properties as systemctl shows them.
+func (m *Machine) unitProps(unit string, props ...string) (map[string]string, error) {
+	args := []string{"show", unit, "--no-pager"}
+	for _, p := range props {
+		args = append(args, "--property="+p)
+	}
+	out, err := m.Out("systemctl", args...)
+	if err != nil {
+		return nil, err
+	}
+	return keyValues(out, "="), nil
+}
+
+// keyValues reads `key<sep>value` lines; a line without the separator is skipped.
+func keyValues(out, sep string) map[string]string {
+	kv := map[string]string{}
+	for _, l := range strings.Split(out, "\n") {
+		k, v, ok := strings.Cut(l, sep)
+		if ok {
+			kv[strings.TrimSpace(k)] = strings.TrimSpace(v)
+		}
+	}
+	return kv
+}

modules/avahi/cmd/avahi-tools/machine_test.go

@@ -0,0 +1,107 @@
+package main
+
+import (
+	"context"
+	"strings"
+	"testing"
+	"time"
+)
+
+// call is one command a fake runner was asked to run.
+type call struct {
+	name string
+	args []string
+}
+
+func (c call) String() string {
+	if len(c.args) == 0 {
+		return c.name
+	}
+	return c.name + " " + strings.Join(c.args, " ")
+}
+
+// fake is a runner answering by the command line it is given, recording every call.
+func fake(answer func(c call) Ran, calls *[]call) Runner {
+	return func(_ context.Context, name string, args ...string) Ran {
+		c := call{name, append([]string(nil), args...)}
+		if calls != nil {
+			*calls = append(*calls, c)
+		}
+		return answer(c)
+	}
+}
+
+// byLine answers from a table keyed by the whole command line, and refuses anything else as a
+// command the test did not expect.
+func byLine(table map[string]Ran, calls *[]call) Runner {
+	return fake(func(c call) Ran {
+		if r, ok := table[c.String()]; ok {
+			return r
+		}
+		return Ran{Status: 99, Stderr: "unexpected command: " + c.String()}
+	}, calls)
+}
+
+func machine(run Runner, uid int) *Machine {
+	return &Machine{Run: run, UID: uid, User: "operator", Account: "operator",
+		ReadFile: func(string) ([]byte, error) { return nil, errNoFile },
+		Now:      func() time.Time { return time.Date(2026, 10, 4, 12, 0, 0, 0, time.UTC) },
+		Sleep:    func(time.Duration) {}}
+}
+
+type noFile struct{}
+
+func (noFile) Error() string { return "no such file" }
+
+var errNoFile = noFile{}
+
+func TestAnActNeedingRootGoesThroughSudoWithoutAPromptUnlessThisIsRoot(t *testing.T) {
+	if p, a := Escalated(1000, "visudo", "-c"); p != "sudo" || strings.Join(a, " ") != "-n visudo -c" {
+		t.Fatalf("not root: %s %v", p, a)
+	}
+	if p, a := Escalated(0, "visudo", "-c"); p != "visudo" || strings.Join(a, " ") != "-c" {
+		t.Fatalf("root: %s %v", p, a)
+	}
+}
+
+func TestFailuresAreNamedNeverReadAsEmpty(t *testing.T) {
+	cases := []struct {
+		r    Ran
+		want string
+	}{
+		{Ran{Status: 127, Err: "ENOENT"}, "sudo is not installed here"},
+		{Ran{Status: 1, Stderr: "sudo: a password is required\n"}, "may not run it without a prompt: sudo: a password is required"},
+		{Ran{Status: 124, Err: "no answer within 20 s"}, "did not answer: no answer within 20 s"},
+		{Ran{Status: 2, Stderr: "boom\nmore"}, "failed (2): boom"},
+	}
+	for _, c := range cases {
+		m := machine(fake(func(call) Ran { return c.r }, nil), 1000)
+		if _, err := m.Root("thing"); err == nil || !strings.Contains(err.Error(), c.want) {
+			t.Errorf("%+v: %v, want %q", c.r, err, c.want)
+		}
+	}
+	m := machine(fake(func(call) Ran { return Ran{Status: 127, Err: "ENOENT"} }, nil), 1000)
+	if _, err := m.Out("thing"); err == nil || !strings.Contains(err.Error(), "thing is not installed") {
+		t.Errorf("a missing program: %v", err)
+	}
+}
+
+func TestAnArgumentIsNeverAnOption(t *testing.T) {
+	for _, bad := range []any{"-rf", "a\nb", 3.0} {
+		if _, err := text(map[string]any{"x": bad}, "x", true); err == nil {
+			t.Errorf("%v was accepted", bad)
+		}
+	}
+	if s, err := text(map[string]any{"x": " ok "}, "x", true); err != nil || s != "ok" {
+		t.Errorf("a plain value: %q %v", s, err)
+	}
+	if _, err := text(map[string]any{}, "x", true); err == nil {
+		t.Error("a missing required value was accepted")
+	}
+	if n, _ := whole(map[string]any{"n": 10000.0}, "n", 5, 1, 100); n != 100 {
+		t.Errorf("not bounded: %d", n)
+	}
+	if _, err := whole(map[string]any{"n": 0.0}, "n", 5, 1, 100); err == nil {
+		t.Error("below the least was accepted")
+	}
+}

modules/avahi/cmd/avahi-tools/main.go

@@ -0,0 +1,85 @@
+// avahi's tools bundle (novox/hq to-be 42 Phase 1, research 026/05): a process the node's runtime
+// launches and speaks MCP over stdio to, through the Go SDK (ADR 0188, ADR 0193). It reads the
+// daemon, the name service's wiring and the packet filter's view of mDNS, browses the local network
+// for services, resolves a name, and lists what the machine publishes. It changes nothing.
+package main
+
+import (
+	"context"
+	"fmt"
+	"os"
+
+	stdio "git.novox.be/novox/mesh-sdk/go"
+)
+
+// binaryName is what the build names this bundle's executable: the manifest's `binary`.
+const binaryName = "avahi-tools"
+
+func bg() context.Context { return context.Background() }
+
+func main() {
+	// An empty name serves as the module the runtime names (MESH_SERVED_MODULE): avahi.
+	if err := stdio.Serve("", tools(ThisMachine())); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+}
+
+func tools(m *Machine) []stdio.Tool {
+	return []stdio.Tool{
+		{
+			Name: "avahi_status",
+			Description: "The daemon's state and version, its configuration as set, the name service switch's hosts line and whether mdns is on it, " +
+				"whether nss-mdns is installed, whether the packet filter accepts inbound mDNS (UDP 5353), whether systemd-resolved runs beside it, " +
+				"and notes naming what keeps discovery from working.",
+			Input: schema(map[string]any{}),
+			Run:   func(map[string]any) (any, error) { return m.GetStatus() },
+		},
+		{
+			Name: "avahi_browse",
+			Description: "Listen on the local network for a few seconds (avahi-browse -prt) and answer every service announced, with interface, " +
+				"protocol, name, type, host, address, port and TXT where it resolved; narrowed to one service type when given. Hearing nothing says why it may be.",
+			Input: schema(map[string]any{
+				"seconds": map[string]any{"type": "integer", "description": "how long to listen (default 5, at most 15)"},
+				"type":    map[string]any{"type": "string", "description": "one service type, e.g. _ssh._tcp (optional)"},
+			}),
+			Run: func(args map[string]any) (any, error) {
+				n, err := whole(args, "seconds", 5, 1, 15)
+				if err != nil {
+					return nil, err
+				}
+				kind, err := text(args, "type", false)
+				if err != nil {
+					return nil, err
+				}
+				return m.Browse(n, kind)
+			},
+		},
+		{
+			Name: "avahi_resolve",
+			Description: "Resolve a .local name to its addresses through avahi, and through the name service (getent) beside it, or an address to its name. " +
+				"An answer from avahi that the name service lacks shows nsswitch unwired; no answer says why it may be.",
+			Input: schema(map[string]any{
+				"name":    map[string]any{"type": "string", "description": "a host name; .local is added when missing"},
+				"address": map[string]any{"type": "string", "description": "an address to name instead"},
+			}),
+			Run: func(args map[string]any) (any, error) {
+				name, err := text(args, "name", false)
+				if err != nil {
+					return nil, err
+				}
+				address, err := text(args, "address", false)
+				if err != nil {
+					return nil, err
+				}
+				return m.Resolve(name, address)
+			},
+		},
+		{
+			Name:        "avahi_services",
+			Description: "What this machine publishes from /etc/avahi/services: each file with the service's name, types and ports.",
+			Input:       schema(map[string]any{}),
+			Run:         func(map[string]any) (any, error) { return m.Services() },
+		},
+	}
+}

modules/avahi/cmd/avahi-tools/manifest_test.go

@@ -0,0 +1,26 @@
+package main
+
+// The module's shape (novox/hq to-be 42 Phase 1, research 027): the package and the daemon, and
+// nothing written into the name service switch or opened in the packet filter — avahi.go says why
+// neither can be declared safely today, and the tools report both instead.
+
+import "testing"
+
+func TestItDeclaresThePackageAndTheDaemonOnly(t *testing.T) {
+	m := manifest(t)
+	if p := m.resource(t, "package"); p["package"] != "avahi" {
+		t.Fatalf("%v", p)
+	}
+	d := m.resource(t, "daemon")
+	if d["unit"] != Daemon || d["state"] != "running" || d["boot"] != "enabled" {
+		t.Fatalf("%v", d)
+	}
+	for _, r := range m.Resources {
+		if r["path"] == NSSwitch || r["package"] == "nss-mdns" {
+			t.Fatalf("%v: the name service switch is left as found", r["id"])
+		}
+	}
+	if len(m.Resources) != 2 {
+		t.Fatalf("%v", m.Resources)
+	}
+}

modules/avahi/cmd/avahi-tools/shape_test.go

@@ -0,0 +1,80 @@
+package main
+
+import (
+	"encoding/json"
+	"os"
+	"testing"
+)
+
+type resource map[string]any
+
+type manifestShape struct {
+	Module       string           `json:"module"`
+	Version      string           `json:"version"`
+	Capabilities []string         `json:"capabilities"`
+	Claims       []map[string]any `json:"claims"`
+	Tools        []string         `json:"tools"`
+	Resources    []resource       `json:"resources"`
+	Build        struct {
+		Artifacts []map[string]any `json:"artifacts"`
+	} `json:"build"`
+}
+
+func manifest(t *testing.T) manifestShape {
+	t.Helper()
+	raw, err := os.ReadFile("../../module.json")
+	if err != nil {
+		t.Fatal(err)
+	}
+	var m manifestShape
+	if err := json.Unmarshal(raw, &m); err != nil {
+		t.Fatal(err)
+	}
+	return m
+}
+
+func (m manifestShape) resource(t *testing.T, id string) resource {
+	t.Helper()
+	for _, r := range m.Resources {
+		if r["id"] == id {
+			return r
+		}
+	}
+	t.Fatalf("no resource %s", id)
+	return nil
+}
+
+// TestToolsAreTheManifests holds the served tools and the manifest's list to one another, and the
+// bundle to the shape the builder compiles and the runtime loads.
+func TestToolsAreTheManifests(t *testing.T) {
+	m := manifest(t)
+	names := map[string]bool{}
+	for _, tool := range tools(machine(nil, 1000)) {
+		if names[tool.Name] {
+			t.Errorf("%s is served twice", tool.Name)
+		}
+		names[tool.Name] = true
+	}
+	for _, want := range m.Tools {
+		if !names[want] {
+			t.Errorf("the manifest lists %s and the bundle does not serve it", want)
+		}
+		delete(names, want)
+	}
+	if len(names) != 0 {
+		t.Errorf("served and not listed: %v", names)
+	}
+	var tools map[string]any
+	for _, a := range m.Build.Artifacts {
+		if a["name"] == "tools" {
+			tools = a
+		}
+	}
+	if tools == nil || tools["kind"] != "bundle" || tools["language"] != "go" || tools["system"] != "arch" ||
+		tools["from"] != "cmd/"+binaryName || tools["binary"] != binaryName {
+		t.Fatalf("the tools artifact: %v", tools)
+	}
+	if loads, _ := tools["loads"].([]any); len(loads) != 1 || loads[0] != binaryName {
+		t.Fatalf("loads: %v", tools["loads"])
+	}
+}

modules/avahi/go.mod

@@ -0,0 +1,5 @@
+module avahi
+
+go 1.22
+
+require git.novox.be/novox/mesh-sdk/go v0.1.6

modules/avahi/go.sum

@@ -0,0 +1,2 @@
+git.novox.be/novox/mesh-sdk/go v0.1.6 h1:9qzdYONYbJdWcu6sxQcq9v1LI0JxcfkiKYkMUzJSkVQ=
+git.novox.be/novox/mesh-sdk/go v0.1.6/go.mod h1:GFuZUElBZ9A++mxgIKo97aXXo+kV0uJ/UkbhQPPIbrY=

modules/avahi/module.json

@@ -0,0 +1,43 @@
+{
+  "module": "avahi",
+  "version": "1",
+  "capabilities": [
+    "package-manager",
+    "service-manager"
+  ],
+  "tools": [
+    "avahi_status",
+    "avahi_browse",
+    "avahi_resolve",
+    "avahi_services"
+  ],
+  "resources": [
+    {
+      "id": "package",
+      "type": "package",
+      "package": "avahi"
+    },
+    {
+      "id": "daemon",
+      "type": "service",
+      "unit": "avahi-daemon.service",
+      "state": "running",
+      "boot": "enabled"
+    }
+  ],
+  "build": {
+    "artifacts": [
+      {
+        "name": "tools",
+        "kind": "bundle",
+        "language": "go",
+        "system": "arch",
+        "from": "cmd/avahi-tools",
+        "binary": "avahi-tools",
+        "loads": [
+          "avahi-tools"
+        ]
+      }
+    ]
+  }
+}

modules/baserow/Dockerfile

@@ -1,24 +0,0 @@
-# baserow's runtime: the tool runtime, carrying this module's compiled code.
-#
-# **Built from this module's own directory and nothing else.** The sdk and the tool runtime are in
-# the base images, published like any other artifact — which is what makes this buildable by the
-# mesh from a repository and a path (novox/hq ADR 0069) rather than only on a workstation that
-# happens to have the siblings.
-#
-# Two bases, named rather than pinned (novox/hq issue 044): the image this is COMPILED in and the
-# image it RUNS in — the second must not carry a compiler. Declared in module.json's `build.on`.
-ARG BUILD_BASE
-ARG RUNTIME_BASE
-
-FROM ${BUILD_BASE} AS build
-WORKDIR /app/modules/baserow
-COPY . .
-RUN node /app/node_modules/typescript/bin/tsc client.ts tools/index.ts \
-      --module NodeNext --moduleResolution NodeNext --target ES2022 --outDir dist
-
-FROM ${RUNTIME_BASE}
-COPY --from=build /app/modules/baserow/dist /app/modules/baserow/dist
-# Every serve-time entrypoint, loaded by the runtime in serve mode: tools and events serve, and a
-# provider's provisioner runs its reconcile loop in the same process, with the broker connected —
-# the convention novox/hq issues 060/061 settled.
-ENV MESH_TOOL_MODULES=/app/modules/baserow/dist/tools/index.js

modules/baserow/client.ts

@@ -2,12 +2,15 @@
 // module's tools and anything else baserow-specific import it; nothing outside baserow does.
 //
 // Baserow authenticates a person with email + password, exchanged for a JWT at /api/user/token-auth/.
-// Those credentials are the mesh's own: a person signs up in Baserow (the standard image creates no
+// The standard image creates no admin from env, so the account is one a person made in Baserow: its
-// admin from env), and the credential is placed in the runtime config file the mesh mounts. Until
+// password is the module's `admin` secret, accepted from the operator, and its email and the public
-// that happens fromEnv throws and the module simply exposes no tools — the same dormant-until-
+// host Baserow answers to reach the runtime config file the mesh mounts (the email from the
-// configured shape gitea uses for its token.
+// assignment's settings). Until both are there fromEnv throws and the module exposes no tools — the
+// same dormant-until-configured shape gitea uses for its token.
 
 import { readFileSync } from "node:fs";
+import { request as httpRequest } from "node:http";
+import { request as httpsRequest } from "node:https";
 
 export interface BaserowApplication {
   id: number;
@@ -68,35 +71,63 @@ export class BaserowClient {
     return h;
   }
 
-  /** Exchange email + password for a JWT, caching it for the client's lifetime. Handles both the
+  /**
+   * One HTTP exchange. Not `fetch`: Node's fetch drops a caller's Host header and sends the URL's
+   * own, and Baserow answers only the host of its BASEROW_PUBLIC_URL — any other Host is looked up
+   * as a published builder site and gets 404, `/api/_health/` included. A co-located caller reaching
+   * it by container name must present the public host, so the request is made with node:http, which
+   * sends the Host it is given.
+   */
+  private send(path: string, method: string, headers: Record<string, string>, body?: string): Promise<{ status: number; text: string }> {
+    const url = new URL(`${this.baseUrl}${path}`);
+    const request = url.protocol === "https:" ? httpsRequest : httpRequest;
+    // A length, never chunked: Baserow's server reads a chunked body as empty.
+    const sent = body === undefined ? headers : { ...headers, "Content-Length": String(Buffer.byteLength(body)) };
+    return new Promise((resolve, reject) => {
+      const req = request(url, { method, headers: sent }, (res) => {
+        let text = "";
+        res.setEncoding("utf8");
+        res.on("data", (chunk: string) => (text += chunk));
+        res.on("end", () => resolve({ status: res.statusCode ?? 0, text }));
+        res.on("error", reject);
+      });
+      req.on("error", reject);
+      if (body !== undefined) req.write(body);
+      req.end();
+    });
+  }
+
+  /** Exchange email + password for a JWT, caching it until Baserow refuses it. Handles both the
    *  older `{ token }` and the newer `{ access_token }` response shapes. */
   async authenticate(): Promise<string> {
     if (this.token) return this.token;
-    const res = await fetch(`${this.baseUrl}/api/user/token-auth/`, {
+    const res = await this.send(
-      method: "POST",
+      "/api/user/token-auth/",
-      headers: this.headers(),
+      "POST",
-      body: JSON.stringify({ email: this.email, password: this.password }),
+      this.headers(),
-    });
+      JSON.stringify({ email: this.email, password: this.password }),
-    if (!res.ok) throw new Error(`baserow auth failed: ${res.status} ${await res.text()}`);
+    );
-    const data = (await res.json()) as { token?: string; access_token?: string };
+    if (res.status < 200 || res.status >= 300) throw new Error(`baserow auth failed: ${res.status} ${res.text}`);
+    const data = JSON.parse(res.text) as { token?: string; access_token?: string };
     const token = data.access_token ?? data.token;
     if (!token) throw new Error("baserow auth returned no token");
     this.token = token;
     return token;
   }
 
-  private async authed<T>(path: string, options: RequestInit = {}): Promise<T> {
+  /** An authenticated GET. A refused token is dropped and the call made once more with a fresh one:
-    const token = await this.authenticate();
+   *  Baserow's access tokens expire after minutes, and the runtime lives for weeks. */
-    const res = await fetch(`${this.baseUrl}${path}`, {
+  private async authed<T>(path: string): Promise<T> {
-      ...options,
+    for (let attempt = 0; ; attempt++) {
-      headers: this.headers({
+      const token = await this.authenticate();
-        Authorization: `JWT ${token}`,
+      const res = await this.send(path, "GET", this.headers({ Authorization: `JWT ${token}` }));
-        ...(options.headers as Record<string, string> | undefined),
+      if (res.status === 401 && attempt === 0) {
-      }),
+        this.token = null;
-    });
+        continue;
-    if (!res.ok) throw new Error(`baserow ${path}: ${res.status} ${await res.text()}`);
+      }
-    const text = await res.text();
+      if (res.status < 200 || res.status >= 300) throw new Error(`baserow ${path}: ${res.status} ${res.text}`);
-    return (text ? JSON.parse(text) : null) as T;
+      return (res.text ? JSON.parse(res.text) : null) as T;
+    }
   }
 
   /** The applications (databases) the account can see, across all its workspaces. */

modules/baserow/module.json

@@ -18,15 +18,14 @@
     }
   },
   "binds": {
-    "postgres-database": "/var/lib/baserow/database.json",
+    "postgres-database": "${dir:state}/database.json",
-    "route": "/var/lib/baserow/route.json"
+    "route": "${dir:state}/route.json"
   },
   "secrets": {
-    "postgres-database": "/var/lib/baserow/database.secret"
+    "postgres-database": "${dir:state}/database.secret"
   },
   "own-secrets": {
-    "secret-key": "/var/lib/baserow/secret-key.secret",
+    "admin": "${dir:state}/admin.secret"
-    "broker": "/var/lib/mesh/baserow/broker"
   },
   "listens": [
     {
@@ -34,35 +33,34 @@
       "port": 80,
       "protocol": "tcp",
       "from": "mesh",
-      "why": "the Baserow web UI and REST API; a public name is a route grant later"
+      "why": "the Baserow web UI and REST API, served by the image's own Caddy; a public name is the route's"
     }
   ],
   "resources": [
     {
       "id": "mesh-state",
       "type": "directory",
-      "path": "/var/lib/mesh/baserow",
+      "mode": "0700",
-      "mode": "0700"
+      "place": "mesh"
     },
     {
       "id": "state",
       "type": "directory",
-      "path": "/var/lib/baserow",
+      "mode": "0700",
-      "mode": "0700"
+      "place": "."
     },
     {
       "id": "data",
       "type": "directory",
-      "path": "/services/baserow/data",
       "mode": "0755",
       "owner": "9999:9999"
     },
     {
       "id": "server-env",
       "type": "file",
-      "path": "/var/lib/baserow/server.env",
+      "path": "${dir:state}/server.env",
       "mode": "0600",
-      "content": "DATABASE_HOST=${bound:postgres-database:at}\nDATABASE_PORT=${bound:postgres-database:port}\nDATABASE_NAME=${bound:postgres-database:as}\nDATABASE_USER=${bound:postgres-database:as}\nDATABASE_PASSWORD=${secret:postgres-database}\nSECRET_KEY=${secret:secret-key}\nBASEROW_PUBLIC_URL=http://localhost\n"
+      "content": "DATABASE_HOST=${bound:postgres-database:at}\nDATABASE_PORT=${bound:postgres-database:port}\nDATABASE_NAME=${bound:postgres-database:as}\nDATABASE_USER=${bound:postgres-database:as}\nDATABASE_PASSWORD_FILE=/run/secrets/database\nDISABLE_EMBEDDED_PSQL=true\nBASEROW_PUBLIC_URL=https://${bound:route:name}\n"
     },
     {
       "id": "net",
@@ -73,65 +71,44 @@
       "id": "server",
       "type": "container",
       "name": "baserow",
-      "image": "baserow/baserow@sha256:834424a10413798567f76428f255dc259445b7f8dcec56598c05b4073bb2a124",
+      "image": "baserow/baserow@sha256:263ea6c4b72c9eccabcd975ffe9fdebf23913a293a514bec6a3897a5e0a5a080",
       "network": "baserow",
       "env-file": [
-        "/var/lib/baserow/server.env"
+        "${dir:state}/server.env"
       ],
       "ports": [
         "80"
       ],
       "volumes": [
-        "/services/baserow/data:/baserow/data"
+        "${dir:data}:/baserow/data",
-      ],
+        "${dir:state}/database.secret:/run/secrets/database:ro"
-      "secrets-in-environment": "baserow reads DATABASE_PASSWORD and SECRET_KEY with os.getenv and has no _FILE twin (settings/base.py); not convertible"
+      ]
     },
     {
       "id": "runtime-config",
       "type": "file",
-      "path": "/var/lib/mesh/baserow/config.json",
+      "path": "${dir:mesh-state}/config.json",
       "mode": "0600",
-      "content": "{}\n",
+      "content": "{\n  \"password\": \"${secret:admin}\",\n  \"host\": \"${bound:route:name}\"\n}\n",
       "merge": "json"
-    },
-    {
-      "id": "runtime",
-      "type": "container",
-      "name": "mesh-baserow",
-      "network": "baserow",
-      "volumes": [
-        "/var/lib/mesh/baserow/broker:/run/secrets/broker:ro",
-        "/var/lib/mesh/baserow/config.json:/run/config/config.json:ro"
-      ],
-      "env": {
-        "MESH_BROKER_FILE": "/run/secrets/broker",
-        "MESH_BASEROW_URL": "http://baserow:80",
-        "MESH_BASEROW_CONFIG_FILE": "/run/config/config.json"
-      },
-      "restart-on": [
-        "runtime-config"
-      ],
-      "artifact": "runtime"
     }
   ],
   "build": {
-    "on": [
-      {
-        "arg": "BUILD_BASE",
-        "module": "mesh-tools",
-        "artifact": "build"
-      },
-      {
-        "arg": "RUNTIME_BASE",
-        "module": "mesh-tools",
-        "artifact": "runtime"
-      }
-    ],
     "artifacts": [
       {
-        "name": "runtime",
+        "name": "tools",
-        "kind": "image",
+        "kind": "bundle",
-        "from": "Dockerfile"
+        "language": "typescript",
+        "entrypoints": [
+          "tools/index.js"
+        ],
+        "loads": [
+          "tools/index.js"
+        ],
+        "env": {
+          "MESH_BASEROW_URL": "http://127.0.0.1:${port:80}",
+          "MESH_BASEROW_CONFIG_FILE": "${dir:mesh-state}/config.json"
+        }
       }
     ]
   }

modules/bazarr/Dockerfile

@@ -1,24 +0,0 @@
-# bazarr's runtime: the tool runtime, carrying this module's compiled code.
-#
-# **Built from this module's own directory and nothing else.** The sdk and the tool runtime are in
-# the base images, published like any other artifact — which is what makes this buildable by the
-# mesh from a repository and a path (novox/hq ADR 0069) rather than only on a workstation that
-# happens to have the siblings.
-#
-# Two bases, named rather than pinned (novox/hq issue 044): the image this is COMPILED in and the
-# image it RUNS in — the second must not carry a compiler. Declared in module.json's `build.on`.
-ARG BUILD_BASE
-ARG RUNTIME_BASE
-
-FROM ${BUILD_BASE} AS build
-WORKDIR /app/modules/bazarr
-COPY . .
-RUN node /app/node_modules/typescript/bin/tsc client.ts index.ts tools/index.ts \
-      --module NodeNext --moduleResolution NodeNext --target ES2022 --outDir dist
-
-FROM ${RUNTIME_BASE}
-COPY --from=build /app/modules/bazarr/dist /app/modules/bazarr/dist
-# Every serve-time entrypoint, loaded by the runtime in serve mode: tools and events serve, and a
-# provider's provisioner runs its reconcile loop in the same process, with the broker connected —
-# the convention novox/hq issues 060/061 settled.
-ENV MESH_TOOL_MODULES=/app/modules/bazarr/dist/index.js,/app/modules/bazarr/dist/tools/index.js

modules/bazarr/client.ts

@@ -1,173 +0,0 @@
-// The Bazarr API client — bazarr's own code, living in the module (novox/hq ADR 0039). Bazarr
-// manages subtitles for a Sonarr/Radarr library: it tracks which episodes and movies are still
-// missing subtitles, searches providers for them, and records what it downloaded. This client
-// talks its /api surface (keyed by an X-API-KEY header); bazarr's tools and events import it.
-
-import { readFileSync } from "node:fs";
-
-export interface WantedSubtitle {
-  kind: "episode" | "movie";
-  title: string; // series + episode, or movie title
-  path?: string;
-  seriesId?: number; // sonarr series id (episodes)
-  episodeId?: number; // sonarr episode id (episodes)
-  radarrId?: number; // radarr movie id (movies)
-  missing: string[]; // language names still missing
-}
-
-export interface ProviderSubtitle {
-  provider: string;
-  language: string;
-  hearingImpaired: boolean;
-  forced: boolean;
-  score?: number;
-  release?: string;
-  subtitle: string; // the opaque token Bazarr uses to download this exact result
-}
-
-export interface HistoryEntry {
-  kind: "episode" | "movie";
-  id: string; // stable dedup key across polls
-  title: string;
-  language?: string;
-  provider?: string;
-  path?: string;
-  timestamp?: string;
-  description?: string;
-}
-
-/** The settings-merged config the mesh delivers (novox/hq ADR 0046): { url, apiKey, token, password, user, ... }. */
-function meshConfig(file?: string): Record<string, string> {
-  if (!file) return {};
-  try { return JSON.parse(readFileSync(file, "utf8")) as Record<string, string>; }
-  catch { return {}; }
-}
-
-/** Read a secret the mesh mounted at a file path (an own-secret delivered by `secret accept`);
- *  absent or unreadable yields undefined so callers fall back rather than crash. */
-function readSecret(file?: string): string | undefined {
-  if (!file) return undefined;
-  try { return readFileSync(file, "utf8").trim(); }
-  catch { return undefined; }
-}
-
-export class BazarrClient {
-  readonly baseUrl: string;
-
-  constructor(
-    url: string,
-    private readonly apiKey: string,
-  ) {
-    this.baseUrl = url.replace(/\/$/, "");
-  }
-
-  /** Build from the module's resolved environment. Bazarr's API is keyed; without URL and key
-   *  there is nothing to talk to, so this throws rather than run half-configured. */
-  static fromEnv(env: NodeJS.ProcessEnv = process.env): BazarrClient {
-    const cfg = meshConfig(env.MESH_BAZARR_CONFIG_FILE);
-    const url = cfg.url ?? env.MESH_BAZARR_URL;
-    const apiKey = cfg.apiKey ?? readSecret(env.MESH_BAZARR_API_KEY_FILE) ?? env.MESH_BAZARR_API_KEY;
-    if (!url) throw new Error("no Bazarr URL — set MESH_BAZARR_URL");
-    if (!apiKey) throw new Error("no Bazarr API key — set MESH_BAZARR_API_KEY");
-    return new BazarrClient(url, apiKey);
-  }
-
-  private async request(method: string, path: string, params: Record<string, string> = {}): Promise<any> {
-    const url = new URL(`${this.baseUrl}/api${path}`);
-    for (const [k, v] of Object.entries(params)) url.searchParams.set(k, v);
-    const res = await fetch(url.toString(), { method, headers: { "X-API-KEY": this.apiKey, Accept: "application/json" } });
-    if (!res.ok) throw new Error(`Bazarr API ${method} ${path}: ${res.status} ${await res.text()}`);
-    // Downloads/patches return an empty body; only GETs carry JSON.
-    const text = await res.text();
-    return text ? JSON.parse(text) : {};
-  }
-
-  private get(path: string, params?: Record<string, string>): Promise<any> {
-    return this.request("GET", path, params);
-  }
-
-  private languageNames(missing: any[]): string[] {
-    return (missing ?? []).map((m: any) => m?.name ?? m?.code2 ?? m?.code3).filter(Boolean);
-  }
-
-  /** Episodes and movies still missing subtitles — Bazarr's core "what's left to do" list. */
-  async getWanted(limit = 50): Promise<WantedSubtitle[]> {
-    const [eps, movies] = await Promise.all([
-      this.get("/episodes/wanted", { start: "0", length: String(limit) }),
-      this.get("/movies/wanted", { start: "0", length: String(limit) }),
-    ]);
-    const episodes: WantedSubtitle[] = (eps?.data ?? []).map((e: any) => ({
-      kind: "episode" as const,
-      title: `${e.seriesTitle ?? e.series ?? "Unknown"} — ${e.episodeTitle ?? e.episode_title ?? ""}`.trim(),
-      path: e.path,
-      seriesId: e.sonarrSeriesId,
-      episodeId: e.sonarrEpisodeId,
-      missing: this.languageNames(e.missing_subtitles),
-    }));
-    const films: WantedSubtitle[] = (movies?.data ?? []).map((m: any) => ({
-      kind: "movie" as const,
-      title: m.title ?? "Unknown",
-      path: m.path,
-      radarrId: m.radarrId,
-      missing: this.languageNames(m.missing_subtitles),
-    }));
-    return [...episodes, ...films];
-  }
-
-  /** Ask providers what subtitles are available for one wanted episode — a manual search. */
-  async searchEpisode(episodeId: number): Promise<ProviderSubtitle[]> {
-    const raw = await this.get("/providers/episodes", { episodeid: String(episodeId) });
-    return this.mapProviderResults(raw);
-  }
-
-  /** Ask providers what subtitles are available for one movie — a manual search. */
-  async searchMovie(radarrId: number): Promise<ProviderSubtitle[]> {
-    const raw = await this.get("/providers/movies", { radarrid: String(radarrId) });
-    return this.mapProviderResults(raw);
-  }
-
-  private mapProviderResults(raw: any): ProviderSubtitle[] {
-    const list = Array.isArray(raw) ? raw : (raw?.data ?? []);
-    return list.map((r: any) => ({
-      provider: r.provider,
-      language: r.language?.name ?? r.language ?? "unknown",
-      hearingImpaired: Boolean(r.hearing_impaired ?? r.hi),
-      forced: Boolean(r.forced),
-      score: r.score,
-      release: r.release_info?.[0] ?? r.release_info,
-      subtitle: r.subtitle,
-    }));
-  }
-
-  /** Recent subtitle-download history, episodes and movies together, newest first. Each entry
-   *  carries a stable id so the events poller can tell a fresh download from one already seen. */
-  async getHistory(limit = 40): Promise<HistoryEntry[]> {
-    const [eps, movies] = await Promise.all([
-      this.get("/episodes/history", { start: "0", length: String(limit) }),
-      this.get("/movies/history", { start: "0", length: String(limit) }),
-    ]);
-    const key = (kind: string, r: any): string =>
-      `${kind}:${r.timestamp ?? r.parsed_timestamp ?? ""}:${r.subtitles_path ?? r.path ?? ""}:${r.language?.code3 ?? r.language ?? ""}`;
-    const episodes: HistoryEntry[] = (eps?.data ?? []).map((r: any) => ({
-      kind: "episode" as const,
-      id: key("episode", r),
-      title: `${r.seriesTitle ?? "Unknown"} — ${r.episodeTitle ?? ""}`.trim(),
-      language: r.language?.name ?? r.language,
-      provider: r.provider,
-      path: r.subtitles_path,
-      timestamp: r.timestamp,
-      description: r.description,
-    }));
-    const films: HistoryEntry[] = (movies?.data ?? []).map((r: any) => ({
-      kind: "movie" as const,
-      id: key("movie", r),
-      title: r.title ?? "Unknown",
-      language: r.language?.name ?? r.language,
-      provider: r.provider,
-      path: r.subtitles_path,
-      timestamp: r.timestamp,
-      description: r.description,
-    }));
-    return [...episodes, ...films];
-  }
-}

modules/bazarr/index.ts

@@ -1,47 +0,0 @@
-// bazarr's events. The tool runtime imports this once the broker is bound. Bazarr's one genuinely
-// observable thing is a subtitle arriving: it works away in the background, searching providers for
-// the missing-subtitle list, and when it succeeds a subtitle appears in its history. That is worth
-// announcing to the mesh.
-//
-// Emits (novox/hq ADR 0041/0042):
-//   module.bazarr.subtitle.downloaded   — a subtitle was fetched for an episode or movie
-//
-// Bazarr has nothing on the mesh it usefully reacts to (a download completing is Sonarr/Radarr's
-// business, and they trigger Bazarr directly), so it consumes nothing — a pure emitter.
-//
-// The event is observation-based: poll history and diff. Primed silently on the first look, or a
-// restart would re-announce the whole recent history as freshly downloaded.
-
-import { emit } from "@novox/mesh-sdk/events";
-import { BazarrClient } from "./client.js";
-
-const bazarr = BazarrClient.fromEnv();
-
-const seen = new Set<string>();
-let primed = false;
-async function pollHistory(): Promise<void> {
-  const entries = await bazarr.getHistory(40);
-  for (const entry of entries) {
-    if (seen.has(entry.id)) continue;
-    if (primed) {
-      await emit("subtitle.downloaded", {
-        kind: entry.kind,
-        title: entry.title,
-        language: entry.language,
-        provider: entry.provider,
-        path: entry.path,
-      });
-    }
-    seen.add(entry.id);
-  }
-  primed = true;
-}
-
-const tick = (fn: () => Promise<void>, everyMs: number): void => {
-  const run = (): void => void fn().catch((err) => console.error(`[bazarr] ${err}`));
-  setInterval(run, everyMs);
-  run();
-};
-tick(pollHistory, 60_000);
-
-console.log("[bazarr] watching subtitle-download history");

modules/bazarr/module.json

@@ -1,141 +0,0 @@
-{
-  "module": "bazarr",
-  "version": "1",
-  "capabilities": [
-    "container-runtime"
-  ],
-  "emits": [
-    "subtitle.downloaded"
-  ],
-  "own-secrets": {
-    "broker": "/var/lib/mesh/bazarr/broker",
-    "api-key": "/var/lib/mesh/bazarr/api-key"
-  },
-  "listens": [
-    {
-      "name": "web",
-      "port": 6767,
-      "protocol": "tcp",
-      "from": "mesh",
-      "why": "managing subtitles"
-    }
-  ],
-  "accesses": [
-    {
-      "path": "/services/media/movies",
-      "mode": "read-write"
-    },
-    {
-      "path": "/services/media/series",
-      "mode": "read-write"
-    },
-    {
-      "path": "/services/media/anime",
-      "mode": "read-write"
-    },
-    {
-      "path": "/services/media/downloads",
-      "mode": "read"
-    }
-  ],
-  "resources": [
-    {
-      "id": "mesh-state",
-      "type": "directory",
-      "path": "/var/lib/mesh/bazarr",
-      "mode": "0700"
-    },
-    {
-      "id": "config",
-      "type": "directory",
-      "path": "/services/bazarr/config",
-      "mode": "0700",
-      "owner": "1000:1000"
-    },
-    {
-      "id": "server",
-      "type": "container",
-      "name": "bazarr",
-      "image": "lscr.io/linuxserver/bazarr@sha256:3a820372f19fcb2981ea19fe4b5382934d67414afaba974bce831ddda0a64a02",
-      "env": {
-        "PUID": "1000",
-        "PGID": "1000",
-        "TZ": "Etc/UTC"
-      },
-      "ports": [
-        "6767"
-      ],
-      "volumes": [
-        "/services/bazarr/config:/config",
-        "/services/media/movies:/movies",
-        "/services/media/series:/series",
-        "/services/media/anime:/anime",
-        "/services/media/downloads:/downloads"
-      ]
-    },
-    {
-      "id": "runtime-config",
-      "type": "file",
-      "path": "/var/lib/mesh/bazarr/config.json",
-      "mode": "0600",
-      "content": "{}\n",
-      "merge": "json"
-    },
-    {
-      "id": "runtime",
-      "type": "container",
-      "name": "mesh-bazarr",
-      "network": "host",
-      "volumes": [
-        "/var/lib/mesh/bazarr/broker:/run/secrets/broker:ro",
-        "/var/lib/mesh/bazarr/api-key:/run/secrets/api-key:ro",
-        "/var/lib/mesh/bazarr/config.json:/run/config/config.json:ro",
-        "/services/bazarr/config:/var/lib/bazarr/config:ro"
-      ],
-      "env": {
-        "MESH_BROKER_FILE": "/run/secrets/broker",
-        "MESH_BAZARR_URL": "http://127.0.0.1:6767",
-        "MESH_BAZARR_API_KEY_FILE": "/run/secrets/api-key",
-        "MESH_BAZARR_CONFIG_FILE": "/run/config/config.json",
-        "MESH_BAZARR_CONFIG_DIR": "/var/lib/bazarr/config"
-      },
-      "restart-on": [
-        "runtime-config"
-      ],
-      "artifact": "runtime"
-    }
-  ],
-  "requires": [
-    "route"
-  ],
-  "contributes": {
-    "route": {
-      "label": "subs",
-      "endpoint": "web"
-    }
-  },
-  "binds": {
-    "route": "/var/lib/mesh/bazarr/route.json"
-  },
-  "build": {
-    "on": [
-      {
-        "arg": "BUILD_BASE",
-        "module": "mesh-tools",
-        "artifact": "build"
-      },
-      {
-        "arg": "RUNTIME_BASE",
-        "module": "mesh-tools",
-        "artifact": "runtime"
-      }
-    ],
-    "artifacts": [
-      {
-        "name": "runtime",
-        "kind": "image",
-        "from": "Dockerfile"
-      }
-    ]
-  }
-}

modules/bazarr/package.json

@@ -1,14 +0,0 @@
-{
-  "name": "@novox/module-bazarr",
-  "version": "0.1.0",
-  "description": "bazarr — subtitle management. Its API client, tools and events live here (novox/hq ADR 0039).",
-  "type": "module",
-  "private": true,
-  "dependencies": {
-    "@novox/mesh-sdk": "^0.1.0"
-  },
-  "devDependencies": {
-    "@types/node": "^22.0.0",
-    "typescript": "^5.6.0"
-  }
-}

modules/bazarr/tools/index.ts

@@ -1,57 +0,0 @@
-// bazarr's tools — its own code (novox/hq ADR 0039), importing bazarr's client. They return
-// structured data; the mesh serves them through the sdk's tool harness.
-
-import { registerModuleTools, type ToolDefinition } from "@novox/mesh-sdk/tools";
-import { BazarrClient } from "../client.js";
-
-export function getBazarrTools(bazarr: BazarrClient): ToolDefinition[] {
-  return [
-    {
-      name: "bazarr_wanted",
-      description: "Episodes and movies still missing subtitles, with the languages each still needs.",
-      input: { limit: { type: "number", description: "max items per kind (default 50)" } },
-      run: async (args) => {
-        const wanted = await bazarr.getWanted(args.limit ? Number(args.limit) : 50);
-        return { count: wanted.length, wanted };
-      },
-    },
-    {
-      name: "bazarr_search_subtitles",
-      description: "Manually search subtitle providers for one wanted item — pass an episodeId or a radarrId.",
-      input: {
-        episodeId: { type: "number", description: "a Sonarr episode id (from bazarr_wanted)" },
-        radarrId: { type: "number", description: "a Radarr movie id (from bazarr_wanted)" },
-      },
-      run: async (args) => {
-        if (args.episodeId !== undefined) {
-          const results = await bazarr.searchEpisode(Number(args.episodeId));
-          return { kind: "episode", episodeId: Number(args.episodeId), count: results.length, results };
-        }
-        if (args.radarrId !== undefined) {
-          const results = await bazarr.searchMovie(Number(args.radarrId));
-          return { kind: "movie", radarrId: Number(args.radarrId), count: results.length, results };
-        }
-        throw new Error("pass either episodeId or radarrId");
-      },
-    },
-    {
-      name: "bazarr_history",
-      description: "Recent subtitle-download history — what was downloaded, for which title, from which provider.",
-      input: { limit: { type: "number", description: "max entries per kind (default 40)" } },
-      run: async (args) => {
-        const history = await bazarr.getHistory(args.limit ? Number(args.limit) : 40);
-        return { count: history.length, history };
-      },
-    },
-  ];
-}
-
-// Exposed only when Bazarr is configured; otherwise bazarr contributes no tools rather than
-// failing the whole runtime.
-registerModuleTools("bazarr", (env) => {
-  try {
-    return getBazarrTools(BazarrClient.fromEnv(env));
-  } catch {
-    return [];
-  }
-});

modules/bluetooth/README.md

@@ -0,0 +1,53 @@
+# bluetooth
+
+Bluetooth on the two workstations (novox/hq research 027/02, to-be 42 phase 2 step 9).
+
+## Owns
+
+| what | where |
+|---|---|
+| the Bluetooth stack and its daemon | package `bluez` |
+| `bluetoothctl`, which the tools speak through | package `bluez-utils` |
+| the daemon, running and enabled | `bluetooth.service` |
+
+All official. `/etc/bluetooth/main.conf` is the package's file, unchanged on both workstations
+(every setting commented out). The module states nothing in it, so it declares nothing there.
+
+## Improves
+
+- **The stack is declared, not a dependency of something else.** On both workstations `bluez` is
+  installed only as a dependency. Removing the applet that pulled it in would have left it an orphan
+  for the next clean-up to take, and Bluetooth with it.
+- **An owner for the daemon**, running and enabled on both today with nothing recording why.
+- **Headphones from the mesh.** `bluetooth_connect` and `bluetooth_devices` (with battery) answer from
+  any machine, without the applet.
+
+## Tools
+
+All answer JSON; `(r)` reads, `(a)` acts. They run as the operator account. bluez's bus policy lets
+the account act; if it ever refuses (`AccessDenied`), the act is repeated through `sudo -n`. An act
+whose output says it failed (`Failed to …`, `org.bluez.Error…`, `not available`) is an error, whatever
+bluetoothctl's exit status.
+
+| tool | what |
+|---|---|
+| `bluetooth_controller` (r) | address, name, powered, discoverable, pairable, discovering |
+| `bluetooth_power` (r/a) | read, or switch the controller on or off |
+| `bluetooth_devices` (r) | all, paired, connected or trusted devices: kind, paired, bonded, trusted, blocked, connected, battery where reported |
+| `bluetooth_scan` (r) | discover for 1 to 15 s (default 8); the unpaired devices found, strongest signal first |
+| `bluetooth_connect` / `bluetooth_disconnect` (a) | one device; connect waits up to 15 s |
+| `bluetooth_trust` (a) | trust, or untrust |
+| `bluetooth_pair` (a) | pair with an agent that confirms nothing (headphones, speakers), then trust. A device that shows a code is paired from the desktop |
+| `bluetooth_remove` (a) | forget a device |
+
+## What changes when it is assigned
+
+Nothing on disk on either workstation: both packages are installed, and the service is enabled and
+running. `bluez` becomes explicitly the mesh's.
+
+## Leaves as found
+
+- The paired devices and their keys under `/var/lib/bluetooth` (bluez's state).
+- `blueman` on both workstations, and its applet, which the window manager's configuration starts.
+  That line is the `i3` module's to keep or drop.
+- `bluez-obex` and the AUR terminal client `bluetuith-bin` (with its `-debug`) on the laptop.

modules/bluetooth/cmd/bluetooth-tools/bluetooth.go

@@ -0,0 +1,281 @@
+package main
+
+import (
+	"fmt"
+	"regexp"
+	"sort"
+	"strconv"
+	"strings"
+	"time"
+)
+
+var macAddress = regexp.MustCompile(`^[0-9A-Fa-f]{2}(:[0-9A-Fa-f]{2}){5}$`)
+
+func addressOf(args map[string]any) (string, error) {
+	a, err := text(args, "address")
+	if err != nil {
+		return "", err
+	}
+	if !macAddress.MatchString(a) {
+		return "", fmt.Errorf("%q is not a Bluetooth address (six hex pairs separated by colons)", a)
+	}
+	return strings.ToUpper(a), nil
+}
+
+var ansi = regexp.MustCompile(`\x1b\[[0-9;]*[A-Za-z]|\x01|\x02`)
+
+// btFailed are the words bluetoothctl uses for an act that did not happen, whatever its exit status.
+var btFailed = regexp.MustCompile(`(?m)(Failed to \w+|not available|org\.bluez\.Error\.\w+|No default controller available)`)
+
+// bt runs bluetoothctl once, non-interactively, as the account; bluez's bus policy lets the
+// account act, and if it refuses, the act is run through sudo -n.
+func bt(timeout time.Duration, args ...string) (string, error) {
+	c := Cmd{Name: "bluetoothctl", Args: args, Timeout: timeout}
+	r := run(c)
+	if strings.Contains(r.Stdout+r.Stderr, "AccessDenied") || strings.Contains(r.Stdout+r.Stderr, "Not authorized") {
+		c.Root = true
+		r = run(c)
+	}
+	out := ansi.ReplaceAllString(r.Stdout+"\n"+r.Stderr, "")
+	if r.Error != "" {
+		return out, failure(c, r)
+	}
+	if strings.Contains(out, "No default controller available") {
+		return out, fmt.Errorf("this machine has no Bluetooth controller bluez can use: none is present, it is blocked (rfkill), or bluetooth.service is not running")
+	}
+	if m := btFailed.FindString(out); m != "" || r.Status != 0 {
+		said := strings.TrimSpace(out)
+		if said == "" {
+			said = fmt.Sprintf("exit status %d", r.Status)
+		}
+		return out, fmt.Errorf("bluetoothctl %s: %s", strings.Join(args, " "), tail(said, 1000))
+	}
+	return out, nil
+}
+
+// fields reads bluetoothctl's "\tKey: value" lines; a key seen twice keeps its first value.
+func fields(s string) map[string]string {
+	out := map[string]string{}
+	for _, l := range strings.Split(s, "\n") {
+		if !strings.HasPrefix(l, "\t") {
+			continue
+		}
+		k, v, ok := strings.Cut(strings.TrimSpace(l), ":")
+		if !ok {
+			continue
+		}
+		if _, seen := out[k]; !seen {
+			out[k] = strings.TrimSpace(v)
+		}
+	}
+	return out
+}
+
+func yes(v string) bool { return v == "yes" }
+
+// ControllerAnswer is what bluetooth_controller answers.
+type ControllerAnswer struct {
+	Address      string `json:"address"`
+	Name         string `json:"name"`
+	Alias        string `json:"alias"`
+	Powered      bool   `json:"powered"`
+	PowerState   string `json:"power_state,omitempty"`
+	Discoverable bool   `json:"discoverable"`
+	Pairable     bool   `json:"pairable"`
+	Discovering  bool   `json:"discovering"`
+}
+
+// Controller answers the default controller.
+func Controller() (ControllerAnswer, error) {
+	out, err := bt(CallTimeout, "show")
+	if err != nil {
+		return ControllerAnswer{}, err
+	}
+	c := ControllerAnswer{}
+	for _, l := range strings.Split(out, "\n") {
+		if f := strings.Fields(l); len(f) >= 2 && f[0] == "Controller" {
+			c.Address = f[1]
+			break
+		}
+	}
+	if c.Address == "" {
+		return ControllerAnswer{}, fmt.Errorf("bluetoothctl show answered no controller: %s", tail(strings.TrimSpace(out), 500))
+	}
+	f := fields(out)
+	c.Name, c.Alias, c.PowerState = f["Name"], f["Alias"], f["PowerState"]
+	c.Powered, c.Discoverable, c.Pairable, c.Discovering = yes(f["Powered"]), yes(f["Discoverable"]), yes(f["Pairable"]), yes(f["Discovering"])
+	return c, nil
+}
+
+// Power switches the controller on or off.
+func Power(on bool) (map[string]any, error) {
+	word := "off"
+	if on {
+		word = "on"
+	}
+	if _, err := bt(CallTimeout, "power", word); err != nil {
+		return nil, err
+	}
+	c, err := Controller()
+	if err != nil {
+		return nil, err
+	}
+	return map[string]any{"powered": c.Powered, "asked": word}, nil
+}
+
+// Device is one device bluez knows.
+type Device struct {
+	Address   string `json:"address"`
+	Name      string `json:"name"`
+	Icon      string `json:"kind,omitempty"`
+	Paired    bool   `json:"paired"`
+	Bonded    bool   `json:"bonded"`
+	Trusted   bool   `json:"trusted"`
+	Blocked   bool   `json:"blocked"`
+	Connected bool   `json:"connected"`
+	Battery   *int   `json:"battery_percent,omitempty"`
+	RSSI      *int   `json:"rssi,omitempty"`
+}
+
+var inParens = regexp.MustCompile(`\((-?[0-9]+)\)`)
+
+// number reads "0x50 (80)" or "-62" as a number.
+func number(v string) *int {
+	if m := inParens.FindStringSubmatch(v); m != nil {
+		v = m[1]
+	}
+	n, err := strconv.Atoi(strings.TrimSpace(v))
+	if err != nil {
+		return nil
+	}
+	return &n
+}
+
+// deviceInfo asks bluez for one device.
+func deviceInfo(address string) (Device, error) {
+	out, err := bt(CallTimeout, "info", address)
+	if err != nil {
+		return Device{}, err
+	}
+	f := fields(out)
+	d := Device{Address: address, Name: f["Name"], Icon: f["Icon"], Paired: yes(f["Paired"]), Bonded: yes(f["Bonded"]),
+		Trusted: yes(f["Trusted"]), Blocked: yes(f["Blocked"]), Connected: yes(f["Connected"])}
+	if d.Name == "" {
+		d.Name = f["Alias"]
+	}
+	if v, ok := f["Battery Percentage"]; ok {
+		d.Battery = number(v)
+	}
+	if v, ok := f["RSSI"]; ok {
+		d.RSSI = number(v)
+	}
+	return d, nil
+}
+
+// listed reads "Device <address> <name>" lines.
+func listed(out string) []string {
+	seen := map[string]bool{}
+	addrs := []string{}
+	for _, l := range strings.Split(out, "\n") {
+		f := strings.Fields(strings.TrimSpace(l))
+		if len(f) >= 2 && f[0] == "Device" && macAddress.MatchString(f[1]) && !seen[f[1]] {
+			seen[f[1]] = true
+			addrs = append(addrs, f[1])
+		}
+	}
+	return addrs
+}
+
+// Devices answers the devices bluez knows, with each one's state.
+func Devices(which string) (map[string]any, error) {
+	if err := oneOf("which", which, "all", "paired", "connected", "trusted"); err != nil {
+		return nil, err
+	}
+	args := []string{"devices"}
+	if which != "all" {
+		args = append(args, strings.ToUpper(which[:1])+which[1:])
+	}
+	out, err := bt(CallTimeout, args...)
+	if err != nil {
+		return nil, err
+	}
+	devices := []Device{}
+	for _, a := range listed(out) {
+		d, err := deviceInfo(a)
+		if err != nil {
+			return nil, err
+		}
+		devices = append(devices, d)
+	}
+	sort.SliceStable(devices, func(i, k int) bool {
+		if devices[i].Connected != devices[k].Connected {
+			return devices[i].Connected
+		}
+		return devices[i].Name < devices[k].Name
+	})
+	return map[string]any{"which": which, "count": len(devices), "devices": devices}, nil
+}
+
+// Scan discovers for a while and answers the devices found that are not paired.
+func Scan(seconds int) (map[string]any, error) {
+	// bluetoothctl's own --timeout ends the scan; the command's bound is a little longer.
+	limit := time.Duration(seconds+4) * time.Second
+	if _, err := bt(limit, "--timeout", strconv.Itoa(seconds), "scan", "on"); err != nil {
+		return nil, err
+	}
+	out, err := bt(CallTimeout, "devices")
+	if err != nil {
+		return nil, err
+	}
+	found := []Device{}
+	for _, a := range listed(out) {
+		// A device seen a moment ago may have gone out of reach: it is skipped, not a failure.
+		d, err := deviceInfo(a)
+		if err != nil {
+			continue
+		}
+		if !d.Paired {
+			found = append(found, d)
+		}
+	}
+	sort.SliceStable(found, func(i, k int) bool {
+		ri, rk := -1000, -1000
+		if found[i].RSSI != nil {
+			ri = *found[i].RSSI
+		}
+		if found[k].RSSI != nil {
+			rk = *found[k].RSSI
+		}
+		return ri > rk
+	})
+	return map[string]any{"seconds": seconds, "count": len(found), "found": found}, nil
+}
+
+// Act runs one act on a device and answers the device's state afterwards.
+func Act(verb, address string) (map[string]any, error) {
+	limit := CallTimeout
+	if verb == "connect" {
+		// A connect waits for the device; bluetoothctl's own timeout ends it first.
+		if _, err := bt(limit, "--timeout", "15", verb, address); err != nil {
+			return nil, err
+		}
+	} else if _, err := bt(limit, verb, address); err != nil {
+		return nil, err
+	}
+	if verb == "remove" {
+		return map[string]any{"act": verb, "address": address, "removed": true}, nil
+	}
+	d, err := deviceInfo(address)
+	if err != nil {
+		return nil, err
+	}
+	return map[string]any{"act": verb, "device": d}, nil
+}
+
+// Pair pairs a device with an agent that confirms nothing, then trusts it.
+func Pair(address string) (map[string]any, error) {
+	if _, err := bt(CallTimeout, "--agent", "NoInputNoOutput", "--timeout", "15", "pair", address); err != nil {
+		return nil, err
+	}
+	return Act("trust", address)
+}

modules/bluetooth/cmd/bluetooth-tools/bluetooth_test.go

@@ -0,0 +1,163 @@
+package main
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestTheManifestIsTheStackItsToolsAndTheDaemon(t *testing.T) {
+	m := readManifest(t)
+	holdsTheBundle(t, m, "bluetooth")
+	if got := strings.Join(m.packages(), ","); got != "bluez,bluez-utils" {
+		t.Errorf("packages %s: the applet and the TUI are the operator's", got)
+	}
+	s := m.services()["bluetooth.service"]
+	if s == nil || s["state"] != "running" || s["boot"] != "enabled" {
+		t.Errorf("%v", s)
+	}
+	if len(m.Resources) != 3 {
+		t.Errorf("no configuration file: /etc/bluetooth/main.conf is the package's, unchanged on both workstations: %v", m.Resources)
+	}
+}
+
+const show = "Controller 4C:82:A9:97:01:8E (public)\n\tName: g14\n\tAlias: g14\n\tPowered: yes\n\tPowerState: on\n\tDiscoverable: no\n\tPairable: yes\n\tUUID: Headset (00001108-0000-1000-8000-00805f9b34fb)\n\tDiscovering: no\n"
+
+func headphones(connected bool) string {
+	c := "no"
+	extra := ""
+	if connected {
+		c, extra = "yes", "\tBattery Percentage: 0x50 (80)\n"
+	}
+	return "Device 80:99:E7:C2:29:DA (public)\n\tName: WH-1000XM4\n\tAlias: WH-1000XM4\n\tIcon: audio-headset\n\tPaired: yes\n\tBonded: yes\n\tTrusted: yes\n\tBlocked: no\n\tConnected: " + c + "\n" + extra + "\tUUID: Headset (00001108-0000-1000-8000-00805f9b34fb)\n"
+}
+
+func TestControllerReadsShow(t *testing.T) {
+	using(t, func(string, Cmd) Result { return ok("\x1b[0;94m" + show) })
+	c, err := Controller()
+	if err != nil || c.Address != "4C:82:A9:97:01:8E" || c.Name != "g14" || !c.Powered || c.Discoverable || !c.Pairable {
+		t.Fatalf("%+v %v", c, err)
+	}
+	using(t, func(string, Cmd) Result { return ok("No default controller available\n") })
+	if _, err := Controller(); err == nil || !strings.Contains(err.Error(), "no Bluetooth controller") {
+		t.Fatalf("%v", err)
+	}
+}
+
+func TestDevicesAskEachOneAndReportBatteryWhereGiven(t *testing.T) {
+	f := using(t, func(line string, c Cmd) Result {
+		switch line {
+		case "bluetoothctl devices Paired":
+			return ok("Device 80:99:E7:C2:29:DA WH-1000XM4\nDevice 2C:41:A1:E4:EC:86 Earmuffs\n")
+		case "bluetoothctl info 80:99:E7:C2:29:DA":
+			return ok(headphones(true))
+		}
+		return ok("Device 2C:41:A1:E4:EC:86 (public)\n\tName: Earmuffs\n\tPaired: yes\n\tConnected: no\n")
+	})
+	got, err := Devices("paired")
+	devices := got["devices"].([]Device)
+	if err != nil || got["count"] != 2 || !devices[0].Connected || devices[0].Battery == nil || *devices[0].Battery != 80 || devices[1].Battery != nil {
+		t.Fatalf("%+v %v", got, err)
+	}
+	if f.lines()[0] != "bluetoothctl devices Paired" {
+		t.Errorf("%v", f.lines())
+	}
+	if _, err := Devices("nearby"); err == nil {
+		t.Error("an unknown which")
+	}
+}
+
+func TestAnActThatFailsIsAnErrorWhateverTheExitStatus(t *testing.T) {
+	using(t, func(line string, c Cmd) Result {
+		return ok("Attempting to connect to 80:99:E7:C2:29:DA\nFailed to connect: org.bluez.Error.Failed br-connection-page-timeout\n")
+	})
+	if _, err := Act("connect", "80:99:E7:C2:29:DA"); err == nil || !strings.Contains(err.Error(), "page-timeout") {
+		t.Fatalf("%v", err)
+	}
+	using(t, func(string, Cmd) Result { return Result{Status: 1, Stdout: "Device 00:11:22:33:44:55 not available\n"} })
+	if _, err := Act("trust", "00:11:22:33:44:55"); err == nil || !strings.Contains(err.Error(), "not available") {
+		t.Fatalf("%v", err)
+	}
+}
+
+func TestConnectWaitsWithBluetoothctlsOwnTimeoutAndAnswersTheState(t *testing.T) {
+	f := using(t, func(line string, c Cmd) Result {
+		if strings.Contains(line, "connect") {
+			return ok("Attempting to connect\n[CHG] Device Connected: yes\nConnection successful\n")
+		}
+		return ok(headphones(true))
+	})
+	got, err := Act("connect", "80:99:E7:C2:29:DA")
+	if err != nil || !got["device"].(Device).Connected {
+		t.Fatalf("%v %v", got, err)
+	}
+	if f.lines()[0] != "bluetoothctl --timeout 15 connect 80:99:E7:C2:29:DA" || f.asked[0].Timeout != CallTimeout {
+		t.Errorf("%v", f.lines())
+	}
+}
+
+func TestAnActBluezRefusesTheAccountIsRetriedThroughSudo(t *testing.T) {
+	f := using(t, func(line string, c Cmd) Result {
+		if strings.HasPrefix(line, "sudo") {
+			return ok("Changing power off succeeded\n" + show)
+		}
+		return ok("Failed to set power off: org.freedesktop.DBus.Error.AccessDenied\n")
+	})
+	if _, err := Power(false); err != nil {
+		t.Fatal(err)
+	}
+	if l := f.lines(); l[0] != "bluetoothctl power off" || l[1] != "sudo -n bluetoothctl power off" {
+		t.Errorf("%v", l)
+	}
+}
+
+func TestScanIsBoundedAndAnswersUnpairedDevicesStrongestFirst(t *testing.T) {
+	f := using(t, func(line string, c Cmd) Result {
+		switch {
+		case strings.Contains(line, "scan on"):
+			return ok("Discovery started\n[NEW] Device AA:BB:CC:DD:EE:01 Speaker\n")
+		case line == "bluetoothctl devices":
+			return ok("Device 80:99:E7:C2:29:DA WH-1000XM4\nDevice AA:BB:CC:DD:EE:01 Speaker\nDevice AA:BB:CC:DD:EE:02 Phone\nDevice AA:BB:CC:DD:EE:03 Gone\n")
+		case strings.HasSuffix(line, "EE:01"):
+			return ok("Device AA:BB:CC:DD:EE:01\n\tName: Speaker\n\tPaired: no\n\tRSSI: 0xffffffc4 (-60)\n")
+		case strings.HasSuffix(line, "EE:02"):
+			return ok("Device AA:BB:CC:DD:EE:02\n\tName: Phone\n\tPaired: no\n\tRSSI: -40\n")
+		case strings.HasSuffix(line, "EE:03"):
+			return Result{Status: 1, Stdout: "Device AA:BB:CC:DD:EE:03 not available\n"}
+		}
+		return ok(headphones(false))
+	})
+	got, err := Scan(8)
+	found := got["found"].([]Device)
+	if err != nil || len(found) != 2 || found[0].Name != "Phone" || *found[1].RSSI != -60 {
+		t.Fatalf("%+v %v", got, err)
+	}
+	if f.lines()[0] != "bluetoothctl --timeout 8 scan on" || f.asked[0].Timeout.Seconds() != 12 {
+		t.Errorf("%v %v", f.lines()[0], f.asked[0].Timeout)
+	}
+}
+
+func TestPairUsesAnAgentThatConfirmsNothingAndThenTrusts(t *testing.T) {
+	f := using(t, func(line string, c Cmd) Result {
+		if strings.Contains(line, " pair ") {
+			return ok("Pairing successful\n")
+		}
+		return ok(headphones(false))
+	})
+	if _, err := Pair("80:99:e7:c2:29:da"); err != nil {
+		t.Fatal(err)
+	}
+	if l := f.lines(); l[0] != "bluetoothctl --agent NoInputNoOutput --timeout 15 pair 80:99:e7:c2:29:da" || l[1] != "bluetoothctl trust 80:99:e7:c2:29:da" {
+		t.Errorf("%v", l)
+	}
+}
+
+func TestAnAddressIsSixHexPairs(t *testing.T) {
+	for _, bad := range []string{"", "80:99:E7:C2:29", "80:99:E7:C2:29:DA; rm", "--help", "GG:99:E7:C2:29:DA"} {
+		if _, err := addressOf(map[string]any{"address": bad}); err == nil {
+			t.Errorf("%q accepted", bad)
+		}
+	}
+	if a, err := addressOf(map[string]any{"address": "80:99:e7:c2:29:da"}); err != nil || a != "80:99:E7:C2:29:DA" {
+		t.Errorf("%s %v", a, err)
+	}
+}

modules/bluetooth/cmd/bluetooth-tools/kit.go

@@ -0,0 +1,352 @@
+package main
+
+// kit.go is the same file in each of the workstations' tool bundles (fonts, docker-compose, snapd,
+// flatpak, cups, bluetooth, xclip, dmenu): how a tool runs a command, escalates, bounds what it
+// keeps, and names a failure. A module is built from its own directory, so the file is copied rather
+// than shared; a change to one copy is made to all eight.
+//
+// The rules it holds (novox/hq research 026/05, to-be 38 WP4):
+//   - the node's tool runtime runs as the operator account, not root (ADR 0175 §4); a command that
+//     needs root goes through `sudo -n`, never a prompt, and a refusal is named as such;
+//   - one command gets 20 s, below the runtime's 30 s call limit, and is ended with everything it
+//     started when it takes longer;
+//   - each stream is kept to 256 KiB, and the answer says when it was cut;
+//   - a failure is an error with what went wrong in it, never an empty answer.
+
+import (
+	"bytes"
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"os/exec"
+	"strings"
+	"syscall"
+	"time"
+)
+
+// Bounds every command is held to.
+const (
+	CallTimeout = 20 * time.Second
+	MostOutput  = 256 << 10
+)
+
+// Cmd is one command a tool runs.
+type Cmd struct {
+	Name string
+	Args []string
+	// Stdin is written to the command's standard input when not empty.
+	Stdin string
+	// Env is added to this process's own environment.
+	Env []string
+	// Root says the command needs root: it is run through `sudo -n` when this process is not root.
+	Root bool
+	// Timeout replaces CallTimeout; only a background job (jobs.go) asks for longer.
+	Timeout time.Duration
+	// Detached is for a program that forks a child which outlives it, as xclip does to keep the
+	// selection: its streams go to files, because a pipe the child inherits would hold the call open
+	// until the child exits.
+	Detached bool
+}
+
+// Result is what a command did.
+type Result struct {
+	Stdout string `json:"stdout"`
+	Stderr string `json:"stderr"`
+	Status int    `json:"status"`
+	// Error is why it did not run to an answer: "not-found" when the program is not there,
+	// "timeout" when it was ended for taking too long, else the spawn error.
+	Error     string `json:"error,omitempty"`
+	Truncated bool   `json:"truncated,omitempty"`
+}
+
+// Runner runs a command. Tests replace it; nothing else does.
+type Runner func(Cmd) Result
+
+var (
+	run  Runner = execRun
+	euid        = os.Geteuid
+)
+
+// argv is the command as it is run: through sudo without a prompt when it needs root and this
+// process is not root.
+func argv(c Cmd) (string, []string) {
+	if c.Root && euid() != 0 {
+		return "sudo", append([]string{"-n", c.Name}, c.Args...)
+	}
+	return c.Name, c.Args
+}
+
+// bounded keeps the first MostOutput bytes written to it and notes that more came.
+type bounded struct {
+	b   bytes.Buffer
+	cut bool
+}
+
+func (w *bounded) Write(p []byte) (int, error) {
+	room := MostOutput - w.b.Len()
+	if room <= 0 {
+		w.cut = w.cut || len(p) > 0
+		return len(p), nil
+	}
+	if len(p) > room {
+		w.b.Write(p[:room])
+		w.cut = true
+		return len(p), nil
+	}
+	return w.b.Write(p)
+}
+
+func execRun(c Cmd) Result {
+	timeout := c.Timeout
+	if timeout <= 0 {
+		timeout = CallTimeout
+	}
+	ctx, cancel := context.WithTimeout(context.Background(), timeout)
+	defer cancel()
+	name, args := argv(c)
+	cmd := exec.CommandContext(ctx, name, args...)
+	cmd.Env = append(append(os.Environ(), "LC_ALL=C"), c.Env...)
+	if !c.Detached {
+		// Its own process group, so that ending it on a timeout ends what it started too.
+		cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
+		cmd.Cancel = func() error {
+			if cmd.Process != nil {
+				_ = syscall.Kill(-cmd.Process.Pid, syscall.SIGKILL)
+			}
+			return nil
+		}
+	}
+	cmd.WaitDelay = 2 * time.Second
+	if c.Stdin != "" {
+		cmd.Stdin = strings.NewReader(c.Stdin)
+	}
+	var out, errs bounded
+	var outFile, errFile *os.File
+	if c.Detached {
+		var err error
+		if outFile, err = os.CreateTemp("", "mesh-tool-out-*"); err != nil {
+			return Result{Status: 127, Error: err.Error()}
+		}
+		defer os.Remove(outFile.Name())
+		defer outFile.Close()
+		if errFile, err = os.CreateTemp("", "mesh-tool-err-*"); err != nil {
+			return Result{Status: 127, Error: err.Error()}
+		}
+		defer os.Remove(errFile.Name())
+		defer errFile.Close()
+		cmd.Stdout, cmd.Stderr = outFile, errFile
+	} else {
+		cmd.Stdout, cmd.Stderr = &out, &errs
+	}
+	err := cmd.Run()
+	if c.Detached {
+		for _, f := range []struct {
+			file *os.File
+			into *bounded
+		}{{outFile, &out}, {errFile, &errs}} {
+			if _, e := f.file.Seek(0, io.SeekStart); e == nil {
+				_, _ = io.Copy(f.into, f.file)
+			}
+		}
+	}
+	r := Result{Stdout: out.b.String(), Stderr: errs.b.String(), Truncated: out.cut || errs.cut}
+	var exit *exec.ExitError
+	switch {
+	case err == nil:
+	case ctx.Err() == context.DeadlineExceeded:
+		r.Status, r.Error = 124, "timeout"
+	case errors.Is(err, exec.ErrNotFound) || errors.Is(err, os.ErrNotExist):
+		r.Status, r.Error = 127, "not-found"
+	case errors.As(err, &exit):
+		r.Status = exit.ExitCode()
+	default:
+		r.Status, r.Error = 127, err.Error()
+	}
+	return r
+}
+
+// call runs a command and answers its result, or an error naming what went wrong.
+func call(c Cmd) (Result, error) {
+	r := run(c)
+	if r.Status == 0 && r.Error == "" {
+		return r, nil
+	}
+	return r, failure(c, r)
+}
+
+// failure names how a command failed: not installed, refused escalation, too slow, or its exit
+// status with the end of what it said.
+func failure(c Cmd, r Result) error {
+	program, _ := argv(c)
+	switch {
+	case r.Error == "not-found" && program == "sudo":
+		return fmt.Errorf("%s needs root, and sudo is not installed here for the runtime's account to escalate with", c.Name)
+	case r.Error == "not-found":
+		if hint, ok := providedBy[c.Name]; ok {
+			return fmt.Errorf("%s is not installed on this machine (%s)", c.Name, hint)
+		}
+		return fmt.Errorf("%s is not installed on this machine", c.Name)
+	case r.Error == "timeout":
+		limit := c.Timeout
+		if limit <= 0 {
+			limit = CallTimeout
+		}
+		return fmt.Errorf("%s gave no answer within %s and was ended", c.Name, limit)
+	case r.Error != "":
+		return fmt.Errorf("%s did not run: %s", c.Name, r.Error)
+	case program == "sudo" && strings.Contains(r.Stderr, "command not found"):
+		if hint, ok := providedBy[c.Name]; ok {
+			return fmt.Errorf("%s is not installed on this machine (%s)", c.Name, hint)
+		}
+		return fmt.Errorf("%s is not installed on this machine", c.Name)
+	case program == "sudo" && strings.HasPrefix(strings.TrimSpace(r.Stderr), "sudo:"):
+		return fmt.Errorf("%s needs root, and sudo -n refused the runtime's account: %s (the escalation is the sudo module's to declare)",
+			c.Name, firstLine(r.Stderr))
+	}
+	said := tail(strings.TrimSpace(r.Stderr), 2000)
+	if said == "" {
+		said = tail(strings.TrimSpace(r.Stdout), 2000)
+	}
+	if said == "" {
+		said = "and said nothing"
+	}
+	return fmt.Errorf("%s %s exited %d: %s", c.Name, strings.Join(c.Args, " "), r.Status, said)
+}
+
+func firstLine(s string) string {
+	s = strings.TrimSpace(s)
+	if i := strings.IndexByte(s, '\n'); i >= 0 {
+		return s[:i]
+	}
+	return s
+}
+
+func tail(s string, n int) string {
+	if len(s) <= n {
+		return s
+	}
+	return "…" + s[len(s)-n:]
+}
+
+// lines are a command's output lines, blank ones dropped.
+func lines(s string) []string {
+	out := []string{}
+	for _, l := range strings.Split(s, "\n") {
+		if strings.TrimSpace(l) != "" {
+			out = append(out, strings.TrimRight(l, "\r"))
+		}
+	}
+	return out
+}
+
+// Arguments, read the way a tool's JSON arguments arrive.
+
+func text(args map[string]any, key string) (string, error) {
+	v, ok := args[key]
+	if !ok || v == nil {
+		return "", fmt.Errorf("%s is required", key)
+	}
+	s, ok := v.(string)
+	if !ok {
+		return "", fmt.Errorf("%s must be a string", key)
+	}
+	if strings.TrimSpace(s) == "" {
+		return "", fmt.Errorf("%s must not be empty", key)
+	}
+	return s, nil
+}
+
+func optText(args map[string]any, key, def string) (string, error) {
+	v, ok := args[key]
+	if !ok || v == nil {
+		return def, nil
+	}
+	s, ok := v.(string)
+	if !ok {
+		return "", fmt.Errorf("%s must be a string", key)
+	}
+	if strings.TrimSpace(s) == "" {
+		return def, nil
+	}
+	return s, nil
+}
+
+// optWhole reads a whole number, defaulted, refused below least and held to most.
+func optWhole(args map[string]any, key string, def, least, most int) (int, error) {
+	v, ok := args[key]
+	if !ok || v == nil {
+		return def, nil
+	}
+	f, ok := v.(float64)
+	if !ok {
+		if i, isInt := v.(int); isInt {
+			f = float64(i)
+		} else {
+			return 0, fmt.Errorf("%s must be a number", key)
+		}
+	}
+	if f != float64(int(f)) {
+		return 0, fmt.Errorf("%s must be a whole number", key)
+	}
+	n := int(f)
+	if n < least {
+		return 0, fmt.Errorf("%s must be at least %d", key, least)
+	}
+	if n > most {
+		n = most
+	}
+	return n, nil
+}
+
+func optFlag(args map[string]any, key string, def bool) (bool, error) {
+	v, ok := args[key]
+	if !ok || v == nil {
+		return def, nil
+	}
+	b, ok := v.(bool)
+	if !ok {
+		return false, fmt.Errorf("%s must be true or false", key)
+	}
+	return b, nil
+}
+
+func optList(args map[string]any, key string) ([]string, error) {
+	v, ok := args[key]
+	if !ok || v == nil {
+		return nil, nil
+	}
+	items, ok := v.([]any)
+	if !ok {
+		return nil, fmt.Errorf("%s must be a list of strings", key)
+	}
+	out := make([]string, 0, len(items))
+	for _, it := range items {
+		s, ok := it.(string)
+		if !ok || strings.TrimSpace(s) == "" {
+			return nil, fmt.Errorf("%s must be a list of non-empty strings", key)
+		}
+		out = append(out, s)
+	}
+	return out, nil
+}
+
+// oneOf refuses a value outside a closed set.
+func oneOf(key, value string, allowed ...string) error {
+	for _, a := range allowed {
+		if value == a {
+			return nil
+		}
+	}
+	return fmt.Errorf("%s must be one of %s, not %q", key, strings.Join(allowed, ", "), value)
+}
+
+// plainName refuses a name that could be read as an option or carries a path or a space: package,
+// snap, application and printer names never do.
+func plainName(key, value string) error {
+	if strings.HasPrefix(value, "-") || strings.ContainsAny(value, " \t\n/\\") {
+		return fmt.Errorf("%s %q is not a plain name", key, value)
+	}
+	return nil
+}

modules/bluetooth/cmd/bluetooth-tools/kit_test.go

@@ -0,0 +1,147 @@
+package main
+
+// Tests of kit.go, the same in each workstation module.
+
+import (
+	"strings"
+	"testing"
+	"time"
+)
+
+// fake records the commands asked and answers each from a function of the command line.
+type fake struct {
+	asked  []Cmd
+	answer func(line string, c Cmd) Result
+}
+
+func (f *fake) runner() Runner {
+	return func(c Cmd) Result {
+		f.asked = append(f.asked, c)
+		name, args := argv(c)
+		line := strings.TrimSpace(name + " " + strings.Join(args, " "))
+		if f.answer == nil {
+			return Result{}
+		}
+		return f.answer(line, c)
+	}
+}
+
+func (f *fake) lines() []string {
+	out := []string{}
+	for _, c := range f.asked {
+		name, args := argv(c)
+		out = append(out, strings.TrimSpace(name+" "+strings.Join(args, " ")))
+	}
+	return out
+}
+
+// using installs a fake runner and a non-root uid for one test.
+func using(t *testing.T, answer func(line string, c Cmd) Result) *fake {
+	t.Helper()
+	f := &fake{answer: answer}
+	wasRun, wasUID := run, euid
+	run, euid = f.runner(), func() int { return 1000 }
+	t.Cleanup(func() { run, euid = wasRun, wasUID })
+	return f
+}
+
+func ok(stdout string) Result { return Result{Stdout: stdout} }
+
+func TestKitAnActThatNeedsRootGoesThroughSudoWithoutAPromptUnlessAlreadyRoot(t *testing.T) {
+	was := euid
+	defer func() { euid = was }()
+	euid = func() int { return 1000 }
+	if name, args := argv(Cmd{Name: "x", Args: []string{"a"}, Root: true}); name != "sudo" || strings.Join(args, " ") != "-n x a" {
+		t.Fatalf("not root: %s %v", name, args)
+	}
+	if name, _ := argv(Cmd{Name: "x"}); name != "x" {
+		t.Fatalf("a read is run as the account: %s", name)
+	}
+	euid = func() int { return 0 }
+	if name, _ := argv(Cmd{Name: "x", Root: true}); name != "x" {
+		t.Fatalf("as root no sudo: %s", name)
+	}
+}
+
+func TestKitAFailureIsNamedByHowItFailed(t *testing.T) {
+	was := euid
+	defer func() { euid = was }()
+	euid = func() int { return 1000 }
+	cases := []struct {
+		c    Cmd
+		r    Result
+		want string
+	}{
+		{Cmd{Name: "nothere"}, Result{Status: 127, Error: "not-found"}, "not installed"},
+		{Cmd{Name: "x", Root: true}, Result{Status: 127, Error: "not-found"}, "sudo is not installed"},
+		{Cmd{Name: "x", Root: true}, Result{Status: 1, Stderr: "sudo: a password is required\n"}, "sudo -n refused"},
+		{Cmd{Name: "x", Root: true}, Result{Status: 1, Stderr: "sudo: x: command not found\n"}, "x is not installed"},
+		{Cmd{Name: "x"}, Result{Status: 124, Error: "timeout"}, "within 20s"},
+		{Cmd{Name: "x", Args: []string{"y"}}, Result{Status: 3, Stderr: "boom\n"}, "x y exited 3: boom"},
+		{Cmd{Name: "x"}, Result{Status: 3}, "said nothing"},
+	}
+	for _, k := range cases {
+		err := failure(k.c, k.r)
+		if err == nil || !strings.Contains(err.Error(), k.want) {
+			t.Errorf("%+v: %v, want %q", k.r, err, k.want)
+		}
+	}
+}
+
+func TestKitOutputIsBoundedAndSaysSo(t *testing.T) {
+	var w bounded
+	big := strings.Repeat("a", MostOutput+10)
+	n, _ := w.Write([]byte(big))
+	if n != len(big) || w.b.Len() != MostOutput || !w.cut {
+		t.Fatalf("kept %d of %d, cut %v", w.b.Len(), len(big), w.cut)
+	}
+}
+
+func TestKitTheRealRunnerRunsEndsAndReportsAMissingProgram(t *testing.T) {
+	r := execRun(Cmd{Name: "sh", Args: []string{"-c", "echo out; echo err >&2; exit 3"}})
+	if r.Status != 3 || strings.TrimSpace(r.Stdout) != "out" || strings.TrimSpace(r.Stderr) != "err" {
+		t.Fatalf("%+v", r)
+	}
+	r = execRun(Cmd{Name: "sh", Args: []string{"-c", "sleep 5 & sleep 5"}, Timeout: 200 * time.Millisecond})
+	if r.Error != "timeout" {
+		t.Fatalf("a slow command: %+v", r)
+	}
+	r = execRun(Cmd{Name: "no-such-program-anywhere"})
+	if r.Error != "not-found" {
+		t.Fatalf("a missing program: %+v", r)
+	}
+	r = execRun(Cmd{Name: "cat", Stdin: "given"})
+	if r.Stdout != "given" {
+		t.Fatalf("stdin: %+v", r)
+	}
+	start := time.Now()
+	r = execRun(Cmd{Name: "sh", Args: []string{"-c", "echo kept; (sleep 3 &) ; exit 0"}, Detached: true})
+	if r.Status != 0 || strings.TrimSpace(r.Stdout) != "kept" || time.Since(start) > 2*time.Second {
+		t.Fatalf("a detached command returns when it exits, not when its child does: %+v after %s", r, time.Since(start))
+	}
+}
+
+func TestKitArgumentsAreReadStrictly(t *testing.T) {
+	args := map[string]any{"s": "x", "n": float64(5), "f": 1.5, "b": true, "l": []any{"a", "b"}}
+	if _, err := text(args, "missing"); err == nil {
+		t.Error("a missing required string")
+	}
+	if n, _ := optWhole(args, "n", 1, 1, 3); n != 3 {
+		t.Errorf("held to most: %d", n)
+	}
+	if _, err := optWhole(args, "n", 1, 6, 9); err == nil {
+		t.Error("below least")
+	}
+	if _, err := optWhole(args, "f", 1, 0, 9); err == nil {
+		t.Error("a fraction")
+	}
+	if l, _ := optList(args, "l"); len(l) != 2 {
+		t.Errorf("list: %v", l)
+	}
+	if b, _ := optFlag(args, "b", false); !b {
+		t.Error("flag")
+	}
+	if err := plainName("name", "--all"); err == nil {
+		t.Error("an option as a name")
+	}
+}

modules/bluetooth/cmd/bluetooth-tools/main.go

@@ -0,0 +1,135 @@
+// The bluetooth module's tools (novox/hq research 027/02, 026/05): the controller, the devices with
+// their state and battery, scanning, and pairing, connecting, trusting and forgetting a device. A Go
+// bundle the node's runtime launches over stdio (ADR 0188, ADR 0193); it runs as the operator
+// account, and speaks to bluez through bluetoothctl.
+package main
+
+import (
+	"fmt"
+	"os"
+
+	stdio "git.novox.be/novox/mesh-sdk/go"
+)
+
+var providedBy = map[string]string{
+	"bluetoothctl": "the bluez-utils package, which this module installs",
+}
+
+func main() {
+	if err := stdio.Serve("", tools()); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+}
+
+var addressArg = map[string]any{"type": "string", "description": "the device's address, such as 80:99:E7:C2:29:DA, as bluetooth_devices answers it"}
+
+func withAddress(f func(string) (any, error)) func(map[string]any) (any, error) {
+	return func(args map[string]any) (any, error) {
+		a, err := addressOf(args)
+		if err != nil {
+			return nil, err
+		}
+		return f(a)
+	}
+}
+
+func tools() []stdio.Tool {
+	return []stdio.Tool{
+		{
+			Name:        "bluetooth_controller",
+			Description: "The machine's Bluetooth controller: address, name, powered, discoverable, pairable, discovering. (r)",
+			Input:       map[string]any{},
+			Run:         func(map[string]any) (any, error) { return Controller() },
+		},
+		{
+			Name:        "bluetooth_power",
+			Description: "Whether the controller is powered; with on, switch it on or off. (r/a)",
+			Input:       map[string]any{"on": map[string]any{"type": "boolean", "description": "power the controller on (true) or off (false)"}},
+			Run: func(args map[string]any) (any, error) {
+				if _, given := args["on"]; !given {
+					c, err := Controller()
+					if err != nil {
+						return nil, err
+					}
+					return map[string]any{"powered": c.Powered}, nil
+				}
+				on, err := optFlag(args, "on", true)
+				if err != nil {
+					return nil, err
+				}
+				return Power(on)
+			},
+		},
+		{
+			Name: "bluetooth_devices",
+			Description: "The devices bluez knows: every one, or only the paired, connected or trusted. Each with its " +
+				"name, kind, paired, bonded, trusted, blocked, connected, and its battery where the device reports it. (r)",
+			Input: map[string]any{"which": map[string]any{"type": "string", "enum": []string{"all", "paired", "connected", "trusted"}, "description": "which devices (default all)"}},
+			Run: func(args map[string]any) (any, error) {
+				which, err := optText(args, "which", "all")
+				if err != nil {
+					return nil, err
+				}
+				return Devices(which)
+			},
+		},
+		{
+			Name: "bluetooth_scan",
+			Description: "Discover devices nearby for a few seconds (default 8, at most 15), and answer the ones not " +
+				"paired, with their signal strength. (r)",
+			Input: map[string]any{"seconds": map[string]any{"type": "integer", "description": "how long to scan (default 8, at most 15)"}},
+			Run: func(args map[string]any) (any, error) {
+				s, err := optWhole(args, "seconds", 8, 1, 15)
+				if err != nil {
+					return nil, err
+				}
+				return Scan(s)
+			},
+		},
+		{
+			Name:        "bluetooth_connect",
+			Description: "Connect a paired device, such as headphones. Answers its state afterwards. (a)",
+			Input:       map[string]any{"address": addressArg},
+			Run:         withAddress(func(a string) (any, error) { return Act("connect", a) }),
+		},
+		{
+			Name:        "bluetooth_disconnect",
+			Description: "Disconnect a device. (a)",
+			Input:       map[string]any{"address": addressArg},
+			Run:         withAddress(func(a string) (any, error) { return Act("disconnect", a) }),
+		},
+		{
+			Name:        "bluetooth_trust",
+			Description: "Trust a device, so it may connect by itself; or with trusted false, stop trusting it. (a)",
+			Input:       map[string]any{"address": addressArg, "trusted": map[string]any{"type": "boolean", "description": "trust (default) or untrust"}},
+			Run: func(args map[string]any) (any, error) {
+				a, err := addressOf(args)
+				if err != nil {
+					return nil, err
+				}
+				trusted, err := optFlag(args, "trusted", true)
+				if err != nil {
+					return nil, err
+				}
+				if trusted {
+					return Act("trust", a)
+				}
+				return Act("untrust", a)
+			},
+		},
+		{
+			Name: "bluetooth_pair",
+			Description: "Pair a device found by a scan, and trust it. Works for a device that needs no code to be " +
+				"confirmed, such as headphones; one that shows a code is paired from the desktop. (a)",
+			Input: map[string]any{"address": addressArg},
+			Run:   withAddress(func(a string) (any, error) { return Pair(a) }),
+		},
+		{
+			Name:        "bluetooth_remove",
+			Description: "Forget a device: unpair it and drop what bluez knows of it. (a)",
+			Input:       map[string]any{"address": addressArg},
+			Run:         withAddress(func(a string) (any, error) { return Act("remove", a) }),
+		},
+	}
+}

modules/bluetooth/cmd/bluetooth-tools/manifest_kit_test.go

@@ -0,0 +1,107 @@
+package main
+
+// manifest_kit_test.go is the same file in each workstation module: it reads the module's
+// definition so the module's own tests can hold it to what it says.
+
+import (
+	"encoding/json"
+	"os"
+	"path/filepath"
+	"sort"
+	"strings"
+	"testing"
+)
+
+type manifest struct {
+	Module       string           `json:"module"`
+	Capabilities []string         `json:"capabilities"`
+	Claims       []any            `json:"claims"`
+	Seats        []any            `json:"seats"`
+	Tools        []string         `json:"tools"`
+	Resources    []map[string]any `json:"resources"`
+	Build        struct {
+		Artifacts []map[string]any `json:"artifacts"`
+	} `json:"build"`
+}
+
+func readManifest(t *testing.T) manifest {
+	t.Helper()
+	raw, err := os.ReadFile(filepath.Join("..", "..", "module.json"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	var m manifest
+	if err := json.Unmarshal(raw, &m); err != nil {
+		t.Fatalf("module.json: %v", err)
+	}
+	return m
+}
+
+func (m manifest) resource(id string) map[string]any {
+	for _, r := range m.Resources {
+		if r["id"] == id {
+			return r
+		}
+	}
+	return nil
+}
+
+// packages are the packages the module installs, sorted.
+func (m manifest) packages() []string {
+	out := []string{}
+	for _, r := range m.Resources {
+		if r["type"] == "package" && r["absent"] != true {
+			out = append(out, r["package"].(string))
+		}
+	}
+	sort.Strings(out)
+	return out
+}
+
+// services are the units the module declares, by unit name.
+func (m manifest) services() map[string]map[string]any {
+	out := map[string]map[string]any{}
+	for _, r := range m.Resources {
+		if r["type"] == "service" {
+			out[r["unit"].(string)] = r
+		}
+	}
+	return out
+}
+
+// holdsTheBundle holds the manifest to the Go bundle this directory builds: every tool registered
+// is listed and nothing else, each named <prefix>_…, and the artifact builds this command.
+func holdsTheBundle(t *testing.T, m manifest, prefix string) {
+	t.Helper()
+	registered := []string{}
+	for _, tool := range tools() {
+		registered = append(registered, tool.Name)
+		if !strings.HasPrefix(tool.Name, prefix+"_") {
+			t.Errorf("tool %s is not named %s_…", tool.Name, prefix)
+		}
+		if tool.Description == "" || tool.Run == nil || tool.Input == nil {
+			t.Errorf("tool %s is not described, runnable and given an input schema", tool.Name)
+		}
+	}
+	if strings.Join(registered, ",") != strings.Join(m.Tools, ",") {
+		t.Errorf("registered %v, listed %v", registered, m.Tools)
+	}
+	if len(m.Build.Artifacts) != 1 {
+		t.Fatalf("one artifact, got %d", len(m.Build.Artifacts))
+	}
+	cwd, _ := os.Getwd()
+	binary := filepath.Base(cwd)
+	a := m.Build.Artifacts[0]
+	want := map[string]any{"kind": "bundle", "language": "go", "system": "arch", "from": "cmd/" + binary, "binary": binary}
+	for k, v := range want {
+		if a[k] != v {
+			t.Errorf("artifact %s = %v, want %v", k, a[k], v)
+		}
+	}
+	if loads, _ := a["loads"].([]any); len(loads) != 1 || loads[0] != binary {
+		t.Errorf("artifact loads %v, want [%s]", a["loads"], binary)
+	}
+	if m.Claims != nil || m.Seats != nil {
+		t.Errorf("claims %v, seats %v: this module holds no seat", m.Claims, m.Seats)
+	}
+}

modules/bluetooth/go.mod

@@ -0,0 +1,5 @@
+module bluetooth
+
+go 1.22
+
+require git.novox.be/novox/mesh-sdk/go v0.1.6

modules/bluetooth/go.sum

@@ -0,0 +1,2 @@
+git.novox.be/novox/mesh-sdk/go v0.1.6 h1:9qzdYONYbJdWcu6sxQcq9v1LI0JxcfkiKYkMUzJSkVQ=
+git.novox.be/novox/mesh-sdk/go v0.1.6/go.mod h1:GFuZUElBZ9A++mxgIKo97aXXo+kV0uJ/UkbhQPPIbrY=

modules/bluetooth/module.json

@@ -0,0 +1,53 @@
+{
+  "module": "bluetooth",
+  "version": "1",
+  "capabilities": [
+    "package-manager",
+    "service-manager"
+  ],
+  "tools": [
+    "bluetooth_controller",
+    "bluetooth_power",
+    "bluetooth_devices",
+    "bluetooth_scan",
+    "bluetooth_connect",
+    "bluetooth_disconnect",
+    "bluetooth_trust",
+    "bluetooth_pair",
+    "bluetooth_remove"
+  ],
+  "resources": [
+    {
+      "id": "stack",
+      "type": "package",
+      "package": "bluez"
+    },
+    {
+      "id": "utilities",
+      "type": "package",
+      "package": "bluez-utils"
+    },
+    {
+      "id": "daemon",
+      "type": "service",
+      "unit": "bluetooth.service",
+      "state": "running",
+      "boot": "enabled"
+    }
+  ],
+  "build": {
+    "artifacts": [
+      {
+        "name": "tools",
+        "kind": "bundle",
+        "language": "go",
+        "system": "arch",
+        "from": "cmd/bluetooth-tools",
+        "binary": "bluetooth-tools",
+        "loads": [
+          "bluetooth-tools"
+        ]
+      }
+    ]
+  }
+}

modules/bookshelf/Dockerfile

@@ -1,24 +0,0 @@
-# bookshelf's runtime: the tool runtime, carrying this module's compiled code.
-#
-# **Built from this module's own directory and nothing else.** The sdk and the tool runtime are in
-# the base images, published like any other artifact — which is what makes this buildable by the
-# mesh from a repository and a path (novox/hq ADR 0069) rather than only on a workstation that
-# happens to have the siblings.
-#
-# Two bases, named rather than pinned (novox/hq issue 044): the image this is COMPILED in and the
-# image it RUNS in — the second must not carry a compiler. Declared in module.json's `build.on`.
-ARG BUILD_BASE
-ARG RUNTIME_BASE
-
-FROM ${BUILD_BASE} AS build
-WORKDIR /app/modules/bookshelf
-COPY . .
-RUN node /app/node_modules/typescript/bin/tsc client.ts index.ts tools/index.ts \
-      --module NodeNext --moduleResolution NodeNext --target ES2022 --outDir dist
-
-FROM ${RUNTIME_BASE}
-COPY --from=build /app/modules/bookshelf/dist /app/modules/bookshelf/dist
-# Every serve-time entrypoint, loaded by the runtime in serve mode: tools and events serve, and a
-# provider's provisioner runs its reconcile loop in the same process, with the broker connected —
-# the convention novox/hq issues 060/061 settled.
-ENV MESH_TOOL_MODULES=/app/modules/bookshelf/dist/index.js,/app/modules/bookshelf/dist/tools/index.js

modules/bookshelf/client.ts

@@ -1,136 +0,0 @@
-// The Bookshelf API client — bookshelf's own code, living in the module (novox/hq ADR 0039).
-// Ported from the shared hal `arr` client, but self-contained: in nox each Servarr app owns its own
-// copy, so a change to Bookshelf's API rebuilds only bookshelf and nothing else. Both this module's
-// tools and its events entrypoint import it, and nothing outside bookshelf does.
-//
-// Bookshelf is a Readarr fork (ghcr.io/pennydreadful/bookshelf). It speaks the Servarr v1 API; its
-// content is "book". Unlike Sonarr/Radarr it exposes no calendar endpoint, so there is no calendar
-// tool here — matching hal, which excluded bookshelf from its calendar-capable apps.
-
-import { existsSync, readFileSync } from "node:fs";
-import { join } from "node:path";
-
-// Bookshelf speaks the v1 API; its content is "book".
-const API_VERSION = "v1";
-const CONTENT_ENDPOINT = "book";
-const APP_NAME = "Bookshelf";
-
-export interface BookshelfQueueItem {
-  /** The queue record id — stable while the item is in the queue, so events can diff on it. */
-  id: number;
-  title: string;
-  status: string;
-  size: string;
-  sizeleft: string;
-  timeleft?: string;
-}
-
-export interface BookshelfContentItem {
-  title: string;
-  author?: string;
-  year?: number;
-  status?: string;
-  monitored: boolean;
-}
-
-export class BookshelfClient {
-  readonly baseUrl: string;
-
-  constructor(
-    url: string,
-    private readonly apiKey: string,
-  ) {
-    this.baseUrl = url.replace(/\/$/, "");
-  }
-
-  /**
-   * Build from the module's resolved environment. The URL defaults to the server on this node (the
-   * runtime shares its network), and the API key is read from MESH_BOOKSHELF_API_KEY or, failing
-   * that, discovered from the server's own config.xml under MESH_BOOKSHELF_CONFIG_DIR — the same
-   * file Bookshelf writes it to, so a running server needs nothing configured by hand. Throws when
-   * no key can be found, so the tools/events simply do not load (the harness treats the throw as
-   * "exposes nothing").
-   */
-  static fromEnv(env: NodeJS.ProcessEnv = process.env): BookshelfClient {
-    const url = env.MESH_BOOKSHELF_URL ?? `http://127.0.0.1:${env.MESH_BOOKSHELF_PORT ?? "8787"}`;
-    const configDir = env.MESH_BOOKSHELF_CONFIG_DIR ?? "/config";
-    const apiKey = env.MESH_BOOKSHELF_API_KEY ?? BookshelfClient.detectApiKey(configDir);
-    if (!apiKey) {
-      throw new Error("Bookshelf not configured — set MESH_BOOKSHELF_API_KEY or make the config dir readable");
-    }
-    return new BookshelfClient(url, apiKey);
-  }
-
-  /** Discover the API key from the server's config.xml, falling back to null. Every Servarr app
-   *  writes <ApiKey> into config.xml at the root of its config directory. */
-  static detectApiKey(configDir: string): string | null {
-    const config = join(configDir, "config.xml");
-    if (existsSync(config)) {
-      const match = readFileSync(config, "utf8").match(/<ApiKey>([^<]+)<\/ApiKey>/);
-      if (match) return match[1];
-    }
-    return null;
-  }
-
-  private async get(endpoint: string, params?: Record<string, string>): Promise<unknown> {
-    const url = new URL(`${this.baseUrl}/api/${API_VERSION}/${endpoint}`);
-    if (params) {
-      for (const [k, v] of Object.entries(params)) url.searchParams.set(k, v);
-    }
-    const res = await fetch(url.toString(), { headers: { "X-Api-Key": this.apiKey } });
-    if (!res.ok) throw new Error(`${APP_NAME} API /${endpoint}: ${res.status} ${await res.text()}`);
-    return res.json();
-  }
-
-  async getStatus(): Promise<{ appName: string; version: string }> {
-    const data = (await this.get("system/status")) as { appName?: string; version?: string };
-    return { appName: data.appName || APP_NAME, version: data.version ?? "unknown" };
-  }
-
-  async getContent(limit?: number): Promise<BookshelfContentItem[]> {
-    const data = await this.get(CONTENT_ENDPOINT);
-    const items: any[] = Array.isArray(data) ? data : ((data as any)?.records ?? []);
-    const mapped = items.map((item) => ({
-      title: item.title ?? "Unknown",
-      author: item.author?.authorName ?? item.authorName,
-      year: item.releaseDate ? new Date(item.releaseDate).getFullYear() : item.year,
-      status: item.status,
-      monitored: item.monitored ?? true,
-    }));
-    return limit ? mapped.slice(0, limit) : mapped;
-  }
-
-  /** Library search is a filter over existing content, not an indexer lookup — same as hal's. */
-  async searchContent(term: string): Promise<BookshelfContentItem[]> {
-    const all = await this.getContent();
-    const lower = term.toLowerCase();
-    return all.filter(
-      (item) =>
-        item.title.toLowerCase().includes(lower) ||
-        (item.author?.toLowerCase().includes(lower) ?? false),
-    );
-  }
-
-  async getQueue(): Promise<{ totalRecords: number; items: BookshelfQueueItem[] }> {
-    const data = (await this.get("queue", { pageSize: "50" })) as { totalRecords?: number; records?: any[] };
-    const records = data.records ?? [];
-    return {
-      totalRecords: data.totalRecords ?? records.length,
-      items: records.map((r) => ({
-        id: r.id,
-        title: r.title ?? r.book?.title ?? r.author?.authorName ?? "Unknown",
-        status: r.status ?? "unknown",
-        size: formatBytes(r.size ?? 0),
-        sizeleft: formatBytes(r.sizeleft ?? 0),
-        timeleft: r.timeleft,
-      })),
-    };
-  }
-}
-
-function formatBytes(bytes: number): string {
-  if (bytes === 0) return "0 B";
-  const units = ["B", "KB", "MB", "GB", "TB"];
-  const i = Math.floor(Math.log(bytes) / Math.log(1024));
-  return `${(bytes / Math.pow(1024, i)).toFixed(1)} ${units[i]}`;
-}

modules/bookshelf/index.ts

@@ -1,74 +0,0 @@
-// bookshelf's events. The tool runtime imports this once the broker is bound. It watches the
-// download queue and turns its comings and goings into mesh events — the same mechanism radarr uses,
-// applied to a Servarr book manager.
-//
-// Emits (novox/hq ADR 0041/0042):
-//   module.bookshelf.book.grabbed        — a release entered the queue (Bookshelf grabbed it)
-//   module.bookshelf.download.completed  — a release left the queue, imported. This routing key is
-//                                          what the plex module consumes (module.*.download.completed)
-//                                          to rescan, so a new audiobook becomes a visible item.
-// Consumes: none.
-//
-// NOTE: the hal bookshelf module emitted no events (its hooks only did install-time provisioning).
-// This queue watcher is new in nox, modelled exactly on radarr's — bookshelf is a Servarr app with
-// the same queue semantics, so the diff-and-emit pattern carries over unchanged.
-//
-// The queue is polled and diffed, primed silently on the first look (like plex's index.ts) so a
-// restart mid-download does not re-announce everything already in flight as freshly grabbed.
-
-import { emit } from "@novox/mesh-sdk/events";
-import { BookshelfClient, type BookshelfQueueItem } from "./client.js";
-
-// Building the client throws when Bookshelf has no URL/key yet. Like the tools (see tools/index.ts),
-// the events entrypoint must not crash the runtime for that — it stays idle until configured.
-function buildClient(): BookshelfClient | null {
-  try {
-    return BookshelfClient.fromEnv();
-  } catch {
-    return null;
-  }
-}
-
-const bookshelf = buildClient();
-
-// Bookshelf removes an item from the queue once it has been imported; a "warning"/"failed" status is
-// how a stuck or broken grab shows itself, so we do not call those a completion when they vanish.
-const FAILED_STATUSES = new Set(["failed", "warning"]);
-
-const inQueue = new Map<number, BookshelfQueueItem>();
-let primed = false;
-
-async function pollQueue(bookshelf: BookshelfClient): Promise<void> {
-  const { items } = await bookshelf.getQueue();
-  const now = new Map(items.map((i) => [i.id, i]));
-
-  if (primed) {
-    // Entered the queue since last look — Bookshelf grabbed a release.
-    for (const [id, item] of now) {
-      if (!inQueue.has(id)) await emit("book.grabbed", { title: item.title, status: item.status });
-    }
-    // Left the queue — imported and done, unless it was last seen failing.
-    for (const [id, item] of inQueue) {
-      if (!now.has(id) && !FAILED_STATUSES.has(item.status)) {
-        await emit("download.completed", { title: item.title });
-      }
-    }
-  }
-
-  inQueue.clear();
-  for (const [id, item] of now) inQueue.set(id, item);
-  primed = true;
-}
-
-const tick = (fn: () => Promise<void>, everyMs: number): void => {
-  const run = (): void => void fn().catch((err) => console.error(`[bookshelf] ${err}`));
-  setInterval(run, everyMs);
-  run();
-};
-
-if (bookshelf) {
-  tick(() => pollQueue(bookshelf), 30_000);
-  console.log("[bookshelf] watching the download queue, emitting grabs and completions");
-} else {
-  console.log("[bookshelf] not configured — events idle until an API key is available");
-}

modules/bookshelf/module.json

@@ -1,118 +0,0 @@
-{
-  "module": "bookshelf",
-  "version": "1",
-  "slug": "books",
-  "capabilities": [
-    "container-runtime"
-  ],
-  "emits": [
-    "book.grabbed",
-    "download.completed"
-  ],
-  "consumes": [],
-  "own-secrets": {
-    "broker": "/var/lib/mesh/bookshelf/broker"
-  },
-  "listens": [
-    {
-      "name": "web",
-      "port": 8787,
-      "protocol": "tcp",
-      "from": "mesh",
-      "why": "managing the ebook/audiobook library"
-    }
-  ],
-  "accesses": [
-    {
-      "path": "/services/media/books",
-      "mode": "read-write"
-    },
-    {
-      "path": "/services/media/downloads",
-      "mode": "read-write"
-    }
-  ],
-  "resources": [
-    {
-      "id": "mesh-state",
-      "type": "directory",
-      "path": "/var/lib/mesh/bookshelf",
-      "mode": "0700"
-    },
-    {
-      "id": "config",
-      "type": "directory",
-      "path": "/services/bookshelf/config",
-      "mode": "0700",
-      "owner": "1000:1000"
-    },
-    {
-      "id": "server",
-      "type": "container",
-      "name": "bookshelf",
-      "image": "ghcr.io/pennydreadful/bookshelf@sha256:388eecc94362580eae31ee0a454be6af516f8a311f8432a521c202fb475f4359",
-      "env": {
-        "PUID": "1000",
-        "PGID": "1000",
-        "TZ": "Etc/UTC"
-      },
-      "ports": [
-        "8787"
-      ],
-      "volumes": [
-        "/services/bookshelf/config:/config",
-        "/services/media/books:/books",
-        "/services/media/downloads:/downloads"
-      ]
-    },
-    {
-      "id": "runtime",
-      "type": "container",
-      "name": "mesh-bookshelf",
-      "network": "host",
-      "volumes": [
-        "/var/lib/mesh/bookshelf/broker:/run/secrets/broker:ro",
-        "/services/bookshelf/config:/var/lib/bookshelf/config:ro"
-      ],
-      "env": {
-        "MESH_BROKER_FILE": "/run/secrets/broker",
-        "MESH_BOOKSHELF_URL": "http://127.0.0.1:8787",
-        "MESH_BOOKSHELF_CONFIG_DIR": "/var/lib/bookshelf/config"
-      },
-      "artifact": "runtime"
-    }
-  ],
-  "requires": [
-    "route"
-  ],
-  "contributes": {
-    "route": {
-      "label": "books",
-      "endpoint": "web"
-    }
-  },
-  "binds": {
-    "route": "/var/lib/mesh/bookshelf/route.json"
-  },
-  "build": {
-    "on": [
-      {
-        "arg": "BUILD_BASE",
-        "module": "mesh-tools",
-        "artifact": "build"
-      },
-      {
-        "arg": "RUNTIME_BASE",
-        "module": "mesh-tools",
-        "artifact": "runtime"
-      }
-    ],
-    "artifacts": [
-      {
-        "name": "runtime",
-        "kind": "image",
-        "from": "Dockerfile"
-      }
-    ]
-  }
-}

modules/bookshelf/package.json

@@ -1,14 +0,0 @@
-{
-  "name": "@novox/module-bookshelf",
-  "version": "0.1.0",
-  "description": "bookshelf — ebook/audiobook management (Readarr fork). Its API client, tools and events live here (novox/hq ADR 0039).",
-  "type": "module",
-  "private": true,
-  "dependencies": {
-    "@novox/mesh-sdk": "^0.1.0"
-  },
-  "devDependencies": {
-    "@types/node": "^22.0.0",
-    "typescript": "^5.6.0"
-  }
-}

modules/bookshelf/tools/index.ts

@@ -1,69 +0,0 @@
-// bookshelf's tools — ported from the shared hal `arr` sdk (novox/hq ADR 0039), importing
-// bookshelf's own client. They return structured data (not the pre-formatted text hal returned); the
-// mesh serves them through the sdk's tool harness. Bookshelf has no calendar endpoint, so there is
-// no calendar tool — matching hal, which excluded it from its calendar-capable apps.
-
-import { registerModuleTools, type ToolDefinition } from "@novox/mesh-sdk/tools";
-import { BookshelfClient } from "../client.js";
-
-export function getBookshelfTools(bookshelf: BookshelfClient): ToolDefinition[] {
-  return [
-    {
-      name: "bookshelf_status",
-      description: "Bookshelf status overview: version, book count, monitored count, queue size.",
-      input: {},
-      run: async () => {
-        const [status, content, queue] = await Promise.all([
-          bookshelf.getStatus(),
-          bookshelf.getContent(),
-          bookshelf.getQueue(),
-        ]);
-        return {
-          app: status.appName,
-          version: status.version,
-          books: content.length,
-          monitored: content.filter((c) => c.monitored).length,
-          queue: queue.totalRecords,
-        };
-      },
-    },
-    {
-      name: "bookshelf_library",
-      description: "List books from the Bookshelf library.",
-      input: { limit: { type: "number", description: "max items to return (default 50)" } },
-      run: async (args) => {
-        const items = await bookshelf.getContent(args.limit ? Number(args.limit) : 50);
-        return { count: items.length, books: items };
-      },
-    },
-    {
-      name: "bookshelf_search",
-      description:
-        "Search the Bookshelf library for books by title or author (filters existing content, not indexers).",
-      input: { query: { type: "string", description: "the search term" } },
-      run: async (args) => {
-        const query = String(args.query);
-        return { query, results: await bookshelf.searchContent(query) };
-      },
-    },
-    {
-      name: "bookshelf_queue",
-      description: "Show the Bookshelf download queue — what is downloading and how far along.",
-      input: {},
-      run: async () => {
-        const queue = await bookshelf.getQueue();
-        return { count: queue.totalRecords, items: queue.items };
-      },
-    },
-  ];
-}
-
-// The tools exist only when Bookshelf is configured; without a URL and key, bookshelf contributes
-// none rather than failing the whole runtime.
-registerModuleTools("bookshelf", (env) => {
-  try {
-    return getBookshelfTools(BookshelfClient.fromEnv(env));
-  } catch {
-    return [];
-  }
-});

modules/build-agent/Dockerfile

@@ -1,6 +1,6 @@
 ARG GO_BASE
 ARG ALPINE_BASE
-# builder's own image: the build machine itself, compiled into a container.
+# build-agent's image: the build machine itself, compiled into a container (novox/hq ADR 0190).
 #
 # **The source is not vendored here.** builder's actual code — cmd/mesh-builder, internal/builder,
 # internal/catalogue — lives in the mesh-controller repository, the same control plane it is one

modules/build-agent/README.md

@@ -0,0 +1,15 @@
+# build-agent
+
+The mesh's build machine as a role every machine can hold (novox/hq ADR 0190). It holds the node seat
+`node-build-agent`: every holder pulls one build at a time from the role's one work queue when it is
+idle, so a tier of many images is built by as many machines as hold the seat and are online, and a
+machine that is off builds nothing and blocks nothing. The controller asks the role, never a machine;
+the outcome names the machine that built it.
+
+What a holding machine needs is what the builder always needed, said here once: a container runtime
+(the socket is mounted), the artifact store and the package registry as provisions, a workspace, and
+the bus credential. The code is `cmd/mesh-builder` in the mesh-controller repository, compiled from
+that repository's main (`build.artifacts[].context`); this module ships the packaging.
+
+Assign it to every machine with a container runtime. It replaces `builder`, the one-holder form of the
+same thing; retire that once this is assigned where it was.

modules/build-agent/module.json

@@ -1,13 +1,14 @@
 {
-  "module": "builder",
+  "module": "build-agent",
   "version": "1",
+  "slug": "agent",
   "capabilities": [
     "container-runtime"
   ],
   "claims": [
     {
-      "name": "mesh-build-machine",
+      "name": "node-build-agent",
-      "scope": "mesh"
+      "scope": "node"
     }
   ],
   "requires": [
@@ -15,49 +16,48 @@
     "npm-package-registry"
   ],
   "binds": {
-    "npm-package-registry": "/var/lib/mesh/builder/package-registry.json"
+    "npm-package-registry": "${dir:mesh-state}/package-registry.json"
   },
   "secrets": {
-    "npm-package-registry": "/var/lib/mesh/builder/package-registry.secret"
+    "npm-package-registry": "${dir:mesh-state}/package-registry.secret"
   },
   "own-secrets": {
-    "broker": "/var/lib/mesh/builder/broker"
+    "broker": "${dir:mesh-state}/broker"
   },
   "resources": [
     {
       "id": "mesh-state",
       "type": "directory",
-      "path": "/var/lib/mesh/builder",
+      "mode": "0700",
-      "mode": "0700"
+      "place": "mesh"
     },
     {
       "id": "workspace",
       "type": "directory",
-      "path": "/var/lib/builder/workspace",
       "mode": "0700"
     },
     {
-      "id": "builder-env",
+      "id": "agent-env",
       "type": "file",
-      "path": "/var/lib/mesh/builder/builder.env",
+      "path": "${dir:mesh-state}/build-agent.env",
       "mode": "0600",
-      "content": "MESH_BROKER_FILE=/run/mesh/broker\nMESH_NODE=${machine:name}\nMESH_REGISTRY=${bound:artifact-store:at}:${bound:artifact-store:port}\nMESH_PACKAGE_BINDING=/run/mesh/package-registry.json\nMESH_NPM_TOKEN_FILE=/run/mesh/package-registry.secret\nMESH_WORKSPACE=/var/lib/builder/workspace\n"
+      "content": "MESH_BROKER_FILE=/run/mesh/broker\nMESH_NODE=${machine:name}\nMESH_REGISTRY=${bound:artifact-store:at}:${bound:artifact-store:port}\nMESH_PACKAGE_BINDING=/run/mesh/package-registry.json\nMESH_NPM_TOKEN_FILE=/run/mesh/package-registry.secret\nMESH_WORKSPACE=${dir:workspace}\n"
     },
     {
       "id": "server",
       "type": "container",
-      "name": "mesh-builder",
+      "name": "mesh-build-agent",
       "artifact": "server",
       "env-file": [
-        "/var/lib/mesh/builder/builder.env"
+        "${dir:mesh-state}/build-agent.env"
       ],
       "volumes": [
-        "/var/lib/mesh/builder:/run/mesh:ro",
+        "${dir:mesh-state}:/run/mesh:ro",
-        "/var/lib/builder/workspace:/var/lib/builder/workspace",
+        "${dir:workspace}:${dir:workspace}",
         "/var/run/docker.sock:/var/run/docker.sock"
       ],
       "restart-on": [
-        "builder-env"
+        "agent-env"
       ],
       "network": "host"
     }
@@ -69,7 +69,8 @@
         "kind": "image",
         "from": "Dockerfile",
         "context": {
-          "repository": "https://git.novox.be/novox/mesh-controller.git",
+          "seat": "git",
+          "repository": "novox/mesh-controller",
           "ref": "main"
         }
       }

modules/claude-code/README.md

@@ -0,0 +1,81 @@
+# claude-code
+
+The operator's agent on a machine (novox/hq design 36): its package, its machine-wide managed
+configuration, and the consumer side of the Anthropic licence manager (design 39, ADR 0183).
+
+## What it owns
+
+Two directories, declared, so the mesh refuses a second module owning either:
+
+- `/etc/claude-code`, the agent's machine-wide managed directory, root's, `0755`.
+- `~/.claude` under the operator account's home, the operator's, `0700`. The module owns the directory —
+  that it exists, who owns it, its mode — and of what is inside only what it writes. Everything else
+  in it (memory, history, projects, local settings, a person's own rules and skills) is the person's
+  and is never read or written (hq ADR 0182). Unassigned, the module leaves the directory: the host
+  removes a directory only when it is empty.
+
+## What it writes
+
+Under the agent's managed directory, `/etc/claude-code`, owned whole by this module and rewritten
+whenever the node's tool runtime collects the module's tools:
+
+| file | holds |
+|---|---|
+| `managed-mcp.json` | the tool servers every session loads: the mesh's console as `mesh`, and the servers set in this module's `mcp_servers` setting. **Exclusive**: a server not listed here does not load — not one added with `claude mcp add`, not a project's `.mcp.json`, not a plugin's |
+| `managed-settings.json` | the repositories' attribution convention, the claude.ai connectors kept beside the managed servers, and the key-helper while the node holds an API-key licence |
+| `CLAUDE.md` | how a session on this mesh works, this node's name and role, the conventions |
+
+Under the operator's home, only `~/.claude/.credentials.json`, and only when the licence manager hands
+this node a subscription token. Nothing else under the home is read or written.
+
+## Over NATS
+
+Everything between this module and the rest of the mesh is NATS, in three kinds: an **event** says that
+something happened and carries no secret, because a stream keeps it; a **request** carries a token,
+because nothing keeps it (hq design 32 §10); and **state** is the current value of something every node
+must see, a node that joins later included — kept, so it carries no secret either (hq ADR 0201).
+
+| what | how |
+|---|---|
+| what this node holds | the module's `holdings` state, one key for this node — the account, the kind, fingerprints and expiries, never a token — written at start and whenever the credentials file changes (hq ADR 0206) |
+| a person ran `/login` here | the credentials file gains a refresh token this module never writes; its next report shows it, and the licence manager asks `claude_code_grant` for it, giving its key — the one time a refresh token leaves the node, for the manager to adopt by refreshing it |
+| what this node should hold | the licence manager's `bindings` state, this node's key; on a newer generation this module asks `anthropic-licence-manager.current` for its token, sealed to the key it sends, and writes it access-token-only — so the agent here never refreshes. A node that was off reads its key when it is back |
+| an MCP server registered through this module | a key in the module's `servers` state — `all.<server>` for every node, `<node>.<server>` for one; every node watches it and renders what applies to it, a node's own entry over the one for every node. A node that joins later, or was off, reads the whole current set at start; unregistering is a delete. An entry with a secret in its `env` or `headers` is refused by the runtime |
+
+## Tools
+
+`claude_code_status`, `claude_code_render`, `claude_code_pull`, `claude_code_grant` (for the licence
+manager), `claude_code_mcp_list`,
+`claude_code_mcp_register` (this node by default; `nodes: "all"` or a list for more — called for this
+node alone, its answer names the other nodes running claude-code), `claude_code_mcp_unregister`.
+
+## Settings
+
+Per node or for the whole mesh, through `mesh-controller.settings module=claude-code`:
+
+- `role` — what this node is, in a few words; shown to every session.
+- `mcp_servers` — extra tool servers, set by the operator for the mesh or a node, beside the ones
+  registered through the tools; keyed by name, in the vendor's `.mcp.json` entry shape
+  (`{"type":"http","url":…}` or `{"type":"stdio","command":…,"args":[…]}`). The name `mesh` is the
+  module's own and cannot be set. Put a person's own servers here, or they stop loading.
+
+## On a machine that carried the predecessor
+
+Remove these by hand, once; the mesh removes nothing it did not make (ADR 0182):
+
+- `~/.claude/CLAUDE.md`
+- `~/.claude/rules/00-hal-mesh.md`, `~/.claude/rules/conventions.md`
+- `~/.claude/skills/cleanup/`, `~/.claude/skills/hal-switch-license/`
+- the hand-made console entry in `~/.claude.json` under `mcpServers` — it is ignored now anyway
+
+## Escalation
+
+Writing `/etc/claude-code` needs root. The runtime runs as the operator account, and the module uses
+that account's passwordless `sudo`; on a machine without it, `claude_code_render` says so and nothing
+is written.
+
+## Code
+
+Go, one binary (`cmd/claude-code`) the node's runtime launches. Tested with `go test ./...`; the managed
+instruction file is held to the TypeScript renderer it replaced (`testdata/rendered-by-typescript.json`),
+and the sealed box is the licence manager's own format.

modules/claude-code/cmd/claude-code/claude_code_test.go

@@ -0,0 +1,364 @@
+package main
+
+import (
+	"encoding/json"
+	"os"
+	"path/filepath"
+	"reflect"
+	"strings"
+	"testing"
+	"time"
+)
+
+var now = time.Now().UnixMilli()
+
+func node(t *testing.T, name string) (Paths, map[string]string) {
+	t.Helper()
+	root := t.TempDir()
+	p := Paths{State: filepath.Join(root, "state"), Facts: filepath.Join(root, "state", "facts.json"),
+		Settings: filepath.Join(root, "state", "settings.json"), Home: filepath.Join(root, "home"), Node: name}
+	_ = os.MkdirAll(p.State, 0o700)
+	_ = os.MkdirAll(filepath.Join(p.Home, ".claude"), 0o700)
+	_ = os.WriteFile(p.Facts, []byte(`{"node":"`+name+`","console":"http://127.0.0.1:4270/mcp"}`), 0o600)
+	_ = os.WriteFile(p.Settings, []byte(`{"role":"","mcp_servers":{}}`), 0o600)
+	return p, map[string]string{}
+}
+
+func writer(w map[string]string) WriteManaged {
+	return func(name, content string) (string, error) { w[name] = content; return name + ": written", nil }
+}
+
+func writeFile(t *testing.T, path, content string) {
+	t.Helper()
+	if err := os.WriteFile(path, []byte(content), 0o600); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func creds(t *testing.T, p Paths) map[string]any {
+	t.Helper()
+	var c map[string]any
+	raw, _ := os.ReadFile(p.credentials())
+	if err := json.Unmarshal(raw, &c); err != nil {
+		t.Fatal(err)
+	}
+	return c["claudeAiOauth"].(map[string]any)
+}
+
+// ---- the renderer, held to the TypeScript it replaced -------------------------------------------------
+
+func TestTheRendererWritesWhatTheTypeScriptOneWrote(t *testing.T) {
+	raw, err := os.ReadFile("testdata/rendered-by-typescript.json")
+	if err != nil {
+		t.Fatal(err)
+	}
+	var f struct {
+		Facts      Facts             `json:"facts"`
+		Settings   Settings          `json:"settings"`
+		Registered Servers           `json:"registered"`
+		WithKey    map[string]string `json:"withKey"`
+		Plain      map[string]string `json:"plain"`
+	}
+	if err := json.Unmarshal(raw, &f); err != nil {
+		t.Fatal(err)
+	}
+	same := func(label string, got, want map[string]string) {
+		if got["CLAUDE.md"] != want["CLAUDE.md"] {
+			t.Errorf("%s: CLAUDE.md differs from the TypeScript's:\n--- go\n%s\n--- typescript\n%s", label, got["CLAUDE.md"], want["CLAUDE.md"])
+		}
+		for _, file := range []string{"managed-mcp.json", "managed-settings.json"} {
+			var a, b any
+			_ = json.Unmarshal([]byte(got[file]), &a)
+			_ = json.Unmarshal([]byte(want[file]), &b)
+			if !reflect.DeepEqual(a, b) {
+				t.Errorf("%s: %s means something else:\n--- go\n%s\n--- typescript\n%s", label, file, got[file], want[file])
+			}
+		}
+	}
+	same("with an API key", Render(f.Facts, f.Settings, &Binding{Licence: "api", Kind: "api-key"}, "/state/api-key-helper", f.Registered), f.WithKey)
+	same("plain", Render(f.Facts, Settings{}, nil, "/h", Servers{}), f.Plain)
+}
+
+func TestASettingCannotReplaceTheMeshsOwnEntryAndABadNameIsLeftOut(t *testing.T) {
+	out := Render(Facts{Node: "w", Console: "http://127.0.0.1:4270/mcp"},
+		Settings{MCPServers: map[string]map[string]any{"mesh": {"type": "http", "url": "http://evil"}, "bad name": {}}}, nil, "/h", nil)
+	var mcp struct {
+		MCPServers map[string]map[string]any `json:"mcpServers"`
+	}
+	_ = json.Unmarshal([]byte(out["managed-mcp.json"]), &mcp)
+	if mcp.MCPServers["mesh"]["url"] != "http://127.0.0.1:4270/mcp" || mcp.MCPServers["bad name"] != nil {
+		t.Fatalf("%v", mcp.MCPServers)
+	}
+	if !reflect.DeepEqual(Render(Facts{Console: "x"}, Settings{}, nil, "/h", nil), Render(Facts{Console: "x"}, Settings{}, nil, "/h", nil)) {
+		t.Fatal("rendering is not deterministic")
+	}
+}
+
+// ---- the credentials file -----------------------------------------------------------------------------
+
+func i64(v int64) *int64 { return &v }
+
+func TestTheLineageRules(t *testing.T) {
+	const hour = 3_600_000
+	g := func(at string, exp int64, rtExp int64) Grant {
+		return Grant{AccessToken: at, ExpiresAt: exp, RefreshTokenExpiresAt: i64(rtExp)}
+	}
+	month := now + 30*24*hour
+	if d := DecideApply(&Grant{AccessToken: "A", ExpiresAt: now + hour, RefreshTokenExpiresAt: i64(month)}, g("B", now+2*hour, month), false); !d.Apply {
+		t.Fatal("a newer rotation was refused")
+	}
+	if d := DecideApply(&Grant{AccessToken: "new", ExpiresAt: now + 2*hour, RefreshTokenExpiresAt: i64(month)}, g("old", now+hour, month), false); d.Apply || d.Reason != "not-newer" {
+		t.Fatalf("a late older rotation: %+v", d)
+	}
+	if d := DecideApply(&Grant{AccessToken: "A", ExpiresAt: now + 8*hour, RefreshTokenExpiresAt: i64(month)}, g("re", now+hour, now+5*24*hour), false); !d.Apply || !d.Reissued {
+		t.Fatalf("a re-issued grant: %+v", d)
+	}
+	if d := DecideApply(&Grant{AccessToken: "A", ExpiresAt: now + 8*hour}, g("other", now+hour, month), true); !d.Apply {
+		t.Fatal("a switch was refused")
+	}
+	if d := DecideApply(&Grant{AccessToken: "A"}, Grant{AccessToken: "A"}, true); d.Apply || d.Reason != "already-current" {
+		t.Fatalf("the same token: %+v", d)
+	}
+}
+
+func TestALoginIsSeenAndStrippedWhenTheNodesOwnGrantIsWritten(t *testing.T) {
+	p, _ := node(t, "laptop")
+	writeFile(t, p.credentials(), `{"claudeAiOauth":{"accessToken":"at-login","refreshToken":"rt-login","expiresAt":1700000000000},"other":1}`)
+	login := ReadCredentials(p.credentials())
+	if !HoldsLogin(login) {
+		t.Fatal("a login was not seen")
+	}
+	if err := WriteCredentials(p.credentials(), WithGrant(login, Grant{AccessToken: "at-mesh", ExpiresAt: 1, Scopes: []string{"user:inference"}})); err != nil {
+		t.Fatal(err)
+	}
+	back := ReadCredentials(p.credentials())
+	raw, _ := os.ReadFile(p.credentials())
+	info, _ := os.Stat(p.credentials())
+	if HoldsLogin(back) || GrantOf(back).AccessToken != "at-mesh" || back["other"] == nil || strings.Contains(string(raw), "rt-login") || info.Mode().Perm() != 0o600 {
+		t.Fatalf("written %s (mode %v)", raw, info.Mode())
+	}
+}
+
+func TestTheAccountIsReadFromTheAgentsStateFileAndNeverGuessed(t *testing.T) {
+	p, _ := node(t, "laptop")
+	writeFile(t, p.account(), `{"oauthAccount":{"accountUuid":"u-1","emailAddress":"a@example.org"},"other":2}`)
+	if id := ReadIdentity(p.account()); id == nil || id.AccountUUID != "u-1" || id.EmailAddress != "a@example.org" {
+		t.Fatalf("%+v", id)
+	}
+	if ReadIdentity("/nonexistent/.claude.json") != nil {
+		t.Fatal("an identity from nothing")
+	}
+	writeFile(t, p.account(), `{}`)
+	if ReadIdentity(p.account()) != nil {
+		t.Fatal("an identity from an empty file")
+	}
+}
+
+// ---- the licence, ADR 0206 ----------------------------------------------------------------------------
+
+func TestWhatANodeHoldsIsReportedWithFingerprintsAndItsAccountNeverAToken(t *testing.T) {
+	p, _ := node(t, "laptop")
+	writeFile(t, p.credentials(), `{"claudeAiOauth":{"accessToken":"at-secret","refreshToken":"rt-secret","expiresAt":2000,"refreshTokenExpiresAt":9000}}`)
+	writeFile(t, p.account(), `{"oauthAccount":{"accountUuid":"u-1","emailAddress":"a@example.org"}}`)
+	h := HoldingsOf(p)
+	if h.Node != "laptop" || h.Identity.AccountUUID != "u-1" || *h.Kind != "subscription" || !h.Refresh.Present ||
+		!strings.HasPrefix(*h.Refresh.Fingerprint, "sha256:") || h.Access.ExpiresAt != 2000 || h.ChangedAt == nil {
+		t.Fatalf("%+v", h)
+	}
+	raw, _ := json.Marshal(h)
+	if strings.Contains(string(raw), "at-secret") || strings.Contains(string(raw), "rt-secret") {
+		t.Fatalf("a token is in the report: %s", raw)
+	}
+	var keys map[string]any
+	_ = json.Unmarshal(raw, &keys)
+	for k := range keys {
+		if strings.Contains(strings.ToLower(k), "token") || strings.Contains(strings.ToLower(k), "secret") {
+			t.Fatalf("a field the runtime would refuse: %s", k)
+		}
+	}
+	// The manager reads exactly this shape.
+	if _, err := time.Parse(time.RFC3339Nano, *h.ChangedAt); err != nil {
+		t.Fatalf("the manager cannot read the report's time: %v", err)
+	}
+}
+
+func TestTheGrantAnswersOnlyAWaitingLoginSealedToTheManagersKey(t *testing.T) {
+	p, _ := node(t, "laptop")
+	manager, _ := GenerateKeyPair()
+	if a, _ := GrantFor(p, manager.PublicKey); a.Sealed != nil || a.Waiting == nil || *a.Waiting {
+		t.Fatalf("%+v", a)
+	}
+	writeFile(t, p.credentials(), `{"claudeAiOauth":{"accessToken":"at","refreshToken":"rt-login","expiresAt":1}}`)
+	writeFile(t, p.account(), `{"oauthAccount":{"accountUuid":"u-9"}}`)
+	a, err := GrantFor(p, manager.PublicKey)
+	if err != nil || a.Identity.AccountUUID != "u-9" {
+		t.Fatalf("%+v %v", a, err)
+	}
+	plain, _ := Open(*a.Sealed, manager.PrivateKey)
+	if !strings.Contains(plain, `"refreshToken":"rt-login"`) {
+		t.Fatalf("opened %s", plain)
+	}
+	raw, _ := json.Marshal(a)
+	if strings.Contains(string(raw), "rt-login") {
+		t.Fatal("the refresh token crossed in the clear")
+	}
+}
+
+// seat answers `current` as the manager does: the grant sealed to the key the node sent.
+func seat(t *testing.T, licence, token string, gen int64, asked *[]string) Ask {
+	return func(address string, args any) (json.RawMessage, error) {
+		*asked = append(*asked, address)
+		key := args.(map[string]any)["public_key"].(string)
+		g, _ := json.Marshal(Grant{AccessToken: token, ExpiresAt: now + 3_600_000})
+		box, err := Seal(string(g), key)
+		if err != nil {
+			t.Fatal(err)
+		}
+		return json.Marshal(Current{Licence: licence, Kind: "subscription", Generation: gen, Sealed: &box})
+	}
+}
+
+func TestANewerGenerationFetchesTheTokenOnceByTheSeatsVerb(t *testing.T) {
+	p, w := node(t, "laptop")
+	var asked []string
+	ask := seat(t, "personal", "at-1", 3, &asked)
+	if _, err := OnBinding(p, &BindingState{Licence: "personal", Kind: "subscription", Generation: 3}, ask, writer(w)); err != nil {
+		t.Fatal(err)
+	}
+	if len(asked) != 1 || asked[0] != "seat:anthropic-licence-manager.current" || creds(t, p)["accessToken"] != "at-1" {
+		t.Fatalf("asked %v, credentials %v", asked, creds(t, p))
+	}
+	if done, _ := OnBinding(p, &BindingState{Licence: "personal", Kind: "subscription", Generation: 3}, ask, writer(w)); done != "" || len(asked) != 1 {
+		t.Fatal("an equal generation asked again")
+	}
+	if HoldingsOf(p).Generation != 3 || w["managed-mcp.json"] == "" {
+		t.Fatal("the generation or the managed files were not written")
+	}
+}
+
+func TestTheTokenANodeIsHandedReplacesALoginsGrantAndLeavesNoRefreshToken(t *testing.T) {
+	p, w := node(t, "laptop")
+	writeFile(t, p.credentials(), `{"claudeAiOauth":{"accessToken":"at-old","refreshToken":"rt-spent","expiresAt":`+
+		strings.TrimSpace(string(mustJSON(now+7_200_000)))+`}}`)
+	var asked []string
+	out, err := Pull(p, seat(t, "personal", "at-new", 1, &asked), writer(w))
+	if err != nil || out["applied"] != true {
+		t.Fatalf("%v %v", out, err)
+	}
+	c := creds(t, p)
+	if c["accessToken"] != "at-new" || c["refreshToken"] != nil || HoldingsOf(p).Refresh.Present {
+		t.Fatalf("%v", c)
+	}
+}
+
+func mustJSON(v any) []byte { b, _ := json.Marshal(v); return b }
+
+// ---- MCP servers in state, ADR 0201 -------------------------------------------------------------------
+
+// bus is the `servers` state as every node in a test shares it, with each node's watch.
+type bus struct {
+	kept     map[string]map[string]any
+	watchers []func(ServerChange)
+}
+
+func (b *bus) Put(key string, value any) error {
+	v := value.(map[string]any)
+	b.kept[key] = v
+	for _, w := range b.watchers {
+		w(ServerChange{Key: key, Op: "put", Value: v})
+	}
+	return nil
+}
+
+func (b *bus) Delete(key string) error {
+	delete(b.kept, key)
+	for _, w := range b.watchers {
+		w(ServerChange{Key: key, Op: "delete"})
+	}
+	return nil
+}
+
+func (b *bus) Keys() ([]string, error) {
+	var out []string
+	for k := range b.kept {
+		out = append(out, k)
+	}
+	return out, nil
+}
+
+// join is a node joining: its view takes the current state, then every change.
+func (b *bus) join(p Paths, w map[string]string) *ServerView {
+	v := NewServerView(p)
+	for k, val := range b.kept {
+		_, _ = OnServerChange(v, ServerChange{Key: k, Op: "put", Value: val}, p, writer(w))
+	}
+	b.watchers = append(b.watchers, func(c ServerChange) { _, _ = OnServerChange(v, c, p, writer(w)) })
+	return v
+}
+
+func noOthers() ([]string, error) { return nil, nil }
+
+func TestRegisteringHerePutsItUnderThisNodesKeyAndAsksAboutTheOthers(t *testing.T) {
+	p, w := node(t, "laptop")
+	b := &bus{kept: map[string]map[string]any{}}
+	v := b.join(p, w)
+	r, err := RegisterServer(p, Registration{Name: "search", Entry: map[string]any{"type": "http", "url": "https://s.example/mcp"}}, b, v, writer(w),
+		func() ([]string, error) { return []string{"laptop", "server", "desktop"}, nil })
+	if err != nil || r["here"] != "changed" || !strings.Contains(r["also"].(string), "server, desktop") || b.kept["laptop.search"] == nil {
+		t.Fatalf("%v %v %v", r, err, b.kept)
+	}
+	if !strings.Contains(w["managed-mcp.json"], `"search"`) {
+		t.Fatal("not rendered")
+	}
+}
+
+func TestEveryNodeRegistrationReachesTheOthersAndALateNodeReadsIt(t *testing.T) {
+	a, wa := node(t, "laptop")
+	s, ws := node(t, "server")
+	b := &bus{kept: map[string]map[string]any{}}
+	va := b.join(a, wa)
+	b.join(s, ws)
+	_, _ = RegisterServer(a, Registration{Name: "docs", Entry: map[string]any{"type": "stdio", "command": "docs-mcp"}, Nodes: []string{"all"}}, b, va, writer(wa), noOthers)
+	if Registered(s)["docs"] == nil || !strings.Contains(ws["managed-mcp.json"], "docs-mcp") {
+		t.Fatalf("the other node did not take it: %v", Registered(s))
+	}
+	late, wl := node(t, "desktop")
+	b.join(late, wl)
+	if Registered(late)["docs"] == nil {
+		t.Fatal("a node joining later did not read the current set")
+	}
+	_, _ = RegisterServer(a, Registration{Name: "docs", Nodes: []string{"all"}}, b, va, writer(wa), noOthers)
+	if Registered(s)["docs"] != nil || Registered(late)["docs"] != nil {
+		t.Fatal("an unregistration did not reach every node")
+	}
+}
+
+func TestANodesOwnRegistrationOverridesTheOneForEveryNode(t *testing.T) {
+	a, wa := node(t, "laptop")
+	s, ws := node(t, "server")
+	b := &bus{kept: map[string]map[string]any{}}
+	va := b.join(a, wa)
+	b.join(s, ws)
+	_, _ = RegisterServer(a, Registration{Name: "x", Entry: map[string]any{"type": "http", "url": "https://all"}, Nodes: []string{"all"}}, b, va, writer(wa), noOthers)
+	_, _ = RegisterServer(a, Registration{Name: "x", Entry: map[string]any{"type": "http", "url": "https://laptop"}}, b, va, writer(wa), noOthers)
+	if Registered(a)["x"]["url"] != "https://laptop" || Registered(s)["x"]["url"] != "https://all" {
+		t.Fatalf("%v %v", Registered(a), Registered(s))
+	}
+	r, _ := RegisterServer(a, Registration{Name: "x"}, b, va, writer(wa), noOthers)
+	if !strings.Contains(r["still"].(string), "still applies here") || Registered(a)["x"]["url"] != "https://all" {
+		t.Fatalf("%v", r)
+	}
+}
+
+func TestABadEntryIsRefusedBeforeAnythingIsPut(t *testing.T) {
+	p, w := node(t, "laptop")
+	b := &bus{kept: map[string]map[string]any{}}
+	v := b.join(p, w)
+	r, _ := RegisterServer(p, Registration{Name: "mesh", Entry: map[string]any{"type": "http", "url": "https://x"}}, b, v, writer(w), noOthers)
+	if r["registered"] != false || len(b.kept) != 0 {
+		t.Fatalf("%v %v", r, b.kept)
+	}
+	if done, _ := OnServerChange(v, ServerChange{Key: "server.b", Op: "put", Value: map[string]any{"type": "http", "url": "https://b"}}, p, writer(w)); done != "" {
+		t.Fatal("another node's key changed this one")
+	}
+}

modules/claude-code/cmd/claude-code/grant.go

@@ -0,0 +1,198 @@
+package main
+
+// The agent's credentials file, and whether an offered grant may replace what it holds (novox/hq ADR 0183,
+// ADR 0206, design 36 §5). Pure where it decides, so the rules are tested without a file.
+//
+// The file is the vendor's: `{ claudeAiOauth: { accessToken, expiresAt, refreshTokenExpiresAt?, scopes?,
+// subscriptionType?, rateLimitTier? }, ... }`. A node bound to a licence never holds a refresh token, so
+// the one this module writes never carries one; a refresh token found there is a person's login.
+//
+// The lineage rule is the predecessor's, with the incidents that earned it: a rotation of the same licence
+// is applied only if newer; a grant re-issued by a login is adopted whatever its expiry; a switch to another
+// licence is applied regardless, because across licences the expiries are unrelated numbers.
+
+import (
+	"bytes"
+	"encoding/json"
+	"math"
+	"os"
+	"path/filepath"
+)
+
+// Grant is what the manager hands a node: an access token and its expiries, never a refresh token.
+type Grant struct {
+	AccessToken           string   `json:"accessToken"`
+	ExpiresAt             int64    `json:"expiresAt"`
+	RefreshTokenExpiresAt *int64   `json:"refreshTokenExpiresAt,omitempty"`
+	Scopes                []string `json:"scopes,omitempty"`
+	SubscriptionType      string   `json:"subscriptionType,omitempty"`
+	RateLimitTier         string   `json:"rateLimitTier,omitempty"`
+}
+
+// Decision is whether a handed grant is applied, and why not.
+type Decision struct {
+	Apply    bool
+	Reissued bool
+	Reason   string // already-current | not-newer
+}
+
+// generationTolerance: two refresh-token expiries within a day are one lineage; a login starts a fresh
+// window weeks away.
+const generationTolerance = 24 * 60 * 60 * 1000
+
+func sameGeneration(a, b *int64) bool {
+	if a == nil || b == nil {
+		return true
+	}
+	return math.Abs(float64(*a-*b)) <= generationTolerance
+}
+
+// DecideApply says whether an offered grant replaces the one held; switch is a move to another licence.
+func DecideApply(local *Grant, offered Grant, switching bool) Decision {
+	if local == nil || local.AccessToken == "" {
+		return Decision{Apply: true}
+	}
+	if local.AccessToken == offered.AccessToken {
+		return Decision{Reason: "already-current"}
+	}
+	reissued := !sameGeneration(local.RefreshTokenExpiresAt, offered.RefreshTokenExpiresAt)
+	if !switching && !reissued && local.ExpiresAt >= offered.ExpiresAt {
+		return Decision{Reason: "not-newer"}
+	}
+	return Decision{Apply: true, Reissued: reissued}
+}
+
+// Credentials is the file as found, every key kept — the vendor's other keys are not this module's.
+type Credentials map[string]any
+
+func (c Credentials) oauth() map[string]any {
+	o, _ := c["claudeAiOauth"].(map[string]any)
+	return o
+}
+
+// ReadCredentials reads the file, keeping numbers as written; nil when there is none.
+func ReadCredentials(path string) Credentials {
+	raw, err := os.ReadFile(path)
+	if err != nil {
+		return nil
+	}
+	dec := json.NewDecoder(bytes.NewReader(raw))
+	dec.UseNumber()
+	var c Credentials
+	if dec.Decode(&c) != nil {
+		return nil
+	}
+	return c
+}
+
+func number(v any) (int64, bool) {
+	switch n := v.(type) {
+	case json.Number:
+		i, err := n.Int64()
+		if err != nil {
+			f, err := n.Float64()
+			return int64(f), err == nil
+		}
+		return i, true
+	case float64:
+		return int64(n), true
+	case int64:
+		return n, true
+	}
+	return 0, false
+}
+
+// GrantOf is the grant the file holds, or nil.
+func GrantOf(c Credentials) *Grant {
+	o := c.oauth()
+	at, _ := o["accessToken"].(string)
+	if at == "" {
+		return nil
+	}
+	g := &Grant{AccessToken: at}
+	g.ExpiresAt, _ = number(o["expiresAt"])
+	if v, ok := number(o["refreshTokenExpiresAt"]); ok {
+		g.RefreshTokenExpiresAt = &v
+	}
+	return g
+}
+
+// HoldsLogin says the file holds a refresh token — which this module never writes, so a person's login.
+func HoldsLogin(c Credentials) bool {
+	rt, _ := c.oauth()["refreshToken"].(string)
+	return rt != ""
+}
+
+// RefreshTokenOf is the refresh token a login left, or "".
+func RefreshTokenOf(c Credentials) string {
+	rt, _ := c.oauth()["refreshToken"].(string)
+	return rt
+}
+
+// WithGrant lays the handed grant over what is there, and deletes any refresh token.
+func WithGrant(local Credentials, g Grant) Credentials {
+	next := Credentials{}
+	for k, v := range local {
+		next[k] = v
+	}
+	oauth := map[string]any{}
+	for k, v := range local.oauth() {
+		oauth[k] = v
+	}
+	oauth["accessToken"] = g.AccessToken
+	oauth["expiresAt"] = g.ExpiresAt
+	if g.RefreshTokenExpiresAt != nil {
+		oauth["refreshTokenExpiresAt"] = *g.RefreshTokenExpiresAt
+	}
+	if len(g.Scopes) > 0 {
+		oauth["scopes"] = g.Scopes
+	}
+	if g.SubscriptionType != "" {
+		oauth["subscriptionType"] = g.SubscriptionType
+	}
+	if g.RateLimitTier != "" {
+		oauth["rateLimitTier"] = g.RateLimitTier
+	}
+	delete(oauth, "refreshToken")
+	next["claudeAiOauth"] = oauth
+	return next
+}
+
+// ReplacedBy is the handed grant in place of the old licence's, whole — scopes and subscription included;
+// only keys outside the grant stay. No refresh token survives.
+func ReplacedBy(local Credentials, g Grant) Credentials {
+	next := Credentials{}
+	for k, v := range local {
+		if k != "claudeAiOauth" {
+			next[k] = v
+		}
+	}
+	return WithGrant(next, g)
+}
+
+// WriteCredentials writes atomically at 0600: a partial credentials file must never be read as a whole one.
+func WriteCredentials(path string, c Credentials) error {
+	if err := os.MkdirAll(filepath.Dir(path), 0o700); err != nil {
+		return err
+	}
+	raw, err := indented(c)
+	if err != nil {
+		return err
+	}
+	tmp := path + ".mesh-tmp"
+	if err := os.WriteFile(tmp, raw, 0o600); err != nil {
+		return err
+	}
+	return os.Rename(tmp, path)
+}
+
+// indented is JSON as the agent's own files are written: two-space indent, a trailing newline, nothing
+// escaped that need not be.
+func indented(v any) ([]byte, error) {
+	var b bytes.Buffer
+	enc := json.NewEncoder(&b)
+	enc.SetEscapeHTML(false)
+	enc.SetIndent("", "  ")
+	err := enc.Encode(v)
+	return b.Bytes(), err
+}

modules/claude-code/cmd/claude-code/identity.go

@@ -0,0 +1,84 @@
+package main
+
+// Which account the agent is logged in as (novox/hq ADR 0183): not in the token, but in the agent's own
+// state file beside the home, `~/.claude.json` → `oauthAccount`. Read to report and attribute a login;
+// written, three keys and nothing else, when a licence is switched, so the account Claude Code shows is
+// the one whose token it now holds.
+
+import (
+	"bytes"
+	"encoding/json"
+	"os"
+)
+
+// Identity is an account as the agent's state file names it.
+type Identity struct {
+	AccountUUID      string `json:"accountUuid"`
+	EmailAddress     string `json:"emailAddress,omitempty"`
+	OrganizationUUID string `json:"organizationUuid,omitempty"`
+}
+
+func readState(path string) (map[string]any, bool) {
+	raw, err := os.ReadFile(path)
+	if err != nil {
+		return nil, false
+	}
+	dec := json.NewDecoder(bytes.NewReader(raw))
+	dec.UseNumber()
+	var m map[string]any
+	if dec.Decode(&m) != nil || m == nil {
+		return nil, false
+	}
+	return m, true
+}
+
+// ReadIdentity is the account the state file names, or nil — never a guess.
+func ReadIdentity(path string) *Identity {
+	m, ok := readState(path)
+	if !ok {
+		return nil
+	}
+	a, _ := m["oauthAccount"].(map[string]any)
+	uuid, _ := a["accountUuid"].(string)
+	if uuid == "" {
+		return nil
+	}
+	id := &Identity{AccountUUID: uuid}
+	id.EmailAddress, _ = a["emailAddress"].(string)
+	id.OrganizationUUID, _ = a["organizationUuid"].(string)
+	return id
+}
+
+// WriteIdentity points the state file's account at id, keeping every other key as found; answers whether
+// the file changed. A file that is there and cannot be read as an object is left alone.
+func WriteIdentity(path string, id Identity) (bool, error) {
+	m, ok := readState(path)
+	if !ok {
+		if _, err := os.Stat(path); err == nil {
+			return false, nil
+		}
+		m = map[string]any{}
+	}
+	current, _ := m["oauthAccount"].(map[string]any)
+	if current == nil {
+		current = map[string]any{}
+	}
+	e, _ := current["emailAddress"].(string)
+	o, _ := current["organizationUuid"].(string)
+	if current["accountUuid"] == id.AccountUUID && e == id.EmailAddress && o == id.OrganizationUUID {
+		return false, nil
+	}
+	current["accountUuid"] = id.AccountUUID
+	current["emailAddress"] = id.EmailAddress
+	current["organizationUuid"] = id.OrganizationUUID
+	m["oauthAccount"] = current
+	raw, err := indented(m)
+	if err != nil {
+		return false, err
+	}
+	tmp := path + ".mesh-tmp"
+	if err := os.WriteFile(tmp, raw, 0o600); err != nil {
+		return false, err
+	}
+	return true, os.Rename(tmp, path)
+}

modules/claude-code/cmd/claude-code/instructions.go

@@ -0,0 +1,12 @@
+package main
+
+// instructionsText is the managed instruction file, generated from the TypeScript renderer it replaced so
+// the file under the agent's managed directory did not change by a byte when the module moved to Go;
+// a test holds it to that renderer's own output (testdata/rendered-by-typescript.json).
+func instructionsText(node, role string) string {
+	return "# This machine is a node of a Novox mesh\n\nWritten by the mesh's `claude-code` module. Edit the module's settings or the catalogue, never this file:\nit is rewritten whenever the module renders.\n\n## Who this node is\n\n- **Node:** `" +
+		node +
+		"`\n- **Role:** " +
+		role +
+		"\n- The other nodes, their roles and what runs where: ask the controller (`mesh-controller.nodes`,\n  `mesh-controller.node`). Nothing here lists them, because a copy drifts.\n\n## How a session on this mesh works\n\nThe console is the only way to the mesh: the MCP server named `mesh`. It offers five tools, and\neverything else is an address you find and call through them:\n\n- `mesh_search` — words in, matching addresses out. `mesh_describe` — one address's arguments.\n- `mesh_call` — call an address. A seat the mesh holds once is `<seat>.<verb>` (the mesh's own verbs\n  are `mesh-controller.<verb>`: `status`, `plan`, `node`, `assign`, `push`, `settings`);\n  a module on a machine is `<node>/<module>.<tool>`.\n- `mesh_overview` and `mesh_machine` — the mesh's seats and machines, and what one machine runs.\n\n- **Symptom first.** For an error, a failing service or anything unexpected, search the record with the\n  literal text before forming a hypothesis: the records module's `records_search`, then\n  `records_read`.\n- **Ask the mesh before changing it**, and change it through the controller's verbs or the catalogue.\n- **A licence** through the `anthropic-licence-manager` seat's verbs. Never edit the agent's credentials\n  file by hand, never print or ask for a token.\n\n## Hard rules\n\n- A file the mesh manages is changed through the verb or the catalogue that owns it, never on disk. If\n  unsure, `mesh-controller.plan` for the node says what the mesh writes there.\n- Never write to a store's database by hand; schema changes are numbered migrations.\n- Never push to a main branch: a branch, a pull request, and a human approval for every merge.\n- The mesh creates no symlinks, and nobody else does either.\n- A package is declared in a module, never installed by hand.\n\n## Conventions\n\n- Commit messages are concise, in the imperative, about why.\n- Test before pushing: nodes update unattended.\n- The playbooks in the record say how research, decisions, designs, issues and hand-offs are done.\n"
+}

modules/claude-code/cmd/claude-code/main.go

@@ -0,0 +1,365 @@
+// claude-code's bundle (novox/hq design 36, ADR 0183, ADR 0206): a binary the node's runtime launches over
+// stdio as the operator account (ADR 0193) and is the bus for (ADR 0198). It is given its state directory
+// and two files the mesh renders into it (ADR 0192), beside the runtime's own words.
+//
+// At start it renders the agent's managed directory, reports what this node holds as the module's
+// `holdings` state and again whenever the credentials file changes, watches the licence manager's
+// `bindings` state for this node and fetches the token when it says so, and watches the module's
+// `servers` state — every node's MCP server registrations (ADR 0201). node.go holds the logic.
+//
+// stdout is the MCP channel; everything this module says, it says on stderr.
+package main
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+	"time"
+
+	stdio "git.novox.be/novox/mesh-sdk/go"
+)
+
+func say(format string, args ...any) {
+	fmt.Fprintf(os.Stderr, "[claude-code] "+format+"\n", args...)
+}
+
+// writeManaged writes one managed file as root, only when its content changed. From a staged file, never
+// /dev/stdin: a child's input may be a socket, which /dev/stdin cannot open (found on the first assignment).
+func writeManaged(name, content string) (string, error) {
+	path := filepath.Join(ManagedDir, name)
+	if was, err := os.ReadFile(path); err == nil && string(was) == content {
+		return name + ": unchanged", nil
+	}
+	staged, err := os.MkdirTemp("", "claude-code-")
+	if err != nil {
+		return "", err
+	}
+	defer os.RemoveAll(staged)
+	source := filepath.Join(staged, name)
+	if err := os.WriteFile(source, []byte(content), 0o644); err != nil {
+		return "", err
+	}
+	args := []string{"install", "-D", "-m", "0644", source, path}
+	if os.Geteuid() != 0 {
+		args = append([]string{"sudo", "-n"}, args...)
+	}
+	if out, err := exec.Command(args[0], args[1:]...).CombinedOutput(); err != nil {
+		return "", fmt.Errorf("%s: could not be written to %s (%s); the module writes there through the operator account's passwordless sudo",
+			name, ManagedDir, strings.TrimSpace(string(out)))
+	}
+	return name + ": written", nil
+}
+
+// ask is a tool on the bus, through the runtime: its answer is the tool's value.
+func ask(address string, args any) (json.RawMessage, error) { return stdio.Ask(address, args) }
+
+// stateOf adapts the SDK's state to what node.go asks of one.
+type stateOf struct{ s stdio.KeptState }
+
+func (s stateOf) Put(key string, value any) error { _, err := s.s.Put(key, value); return err }
+func (s stateOf) Delete(key string) error         { return s.s.Delete(key) }
+func (s stateOf) Keys() ([]string, error)         { return s.s.Keys() }
+
+// nodesRunningMe is the nodes claude-code runs on, from the controller's list of modules — for the register
+// tool's question.
+func nodesRunningMe() ([]string, error) {
+	raw, err := ask("seat:mesh-controller.modules", map[string]any{})
+	if err != nil {
+		return nil, err
+	}
+	var answer struct {
+		Output string `json:"output"`
+	}
+	text := string(raw)
+	if json.Unmarshal(raw, &answer) == nil && answer.Output != "" {
+		text = answer.Output
+	}
+	for _, line := range strings.Split(text, "\n") {
+		if !strings.HasPrefix(line, "claude-code ") {
+			continue
+		}
+		_, on, ok := strings.Cut(line, " on ")
+		if !ok || strings.TrimSpace(on) == "nothing" {
+			return nil, nil
+		}
+		var out []string
+		for _, n := range strings.Split(on, ",") {
+			if n = strings.TrimSpace(n); n != "" {
+				out = append(out, n)
+			}
+		}
+		return out, nil
+	}
+	return nil, nil
+}
+
+func fingerprintOfFile(path string) any {
+	raw, err := os.ReadFile(path)
+	if err != nil {
+		return nil
+	}
+	return Fingerprint(string(raw))
+}
+
+func status(p Paths) map[string]any {
+	creds := ReadCredentials(p.credentials())
+	var token any
+	if g := GrantOf(creds); g != nil {
+		token = map[string]any{"fingerprint": Fingerprint(g.AccessToken), "expiresAt": stamp(g.ExpiresAt), "loginWaiting": HoldsLogin(creds)}
+	}
+	var managed []map[string]any
+	for _, f := range []string{"managed-mcp.json", "managed-settings.json", "CLAUDE.md"} {
+		path := filepath.Join(ManagedDir, f)
+		managed = append(managed, map[string]any{"file": path, "fingerprint": fingerprintOfFile(path)})
+	}
+	var licence any
+	var b Binding
+	if readJSON(p.binding(), &b) {
+		licence = b
+	}
+	names := []string{}
+	for n := range Registered(p) {
+		names = append(names, n)
+	}
+	return map[string]any{"node": p.Node, "licence": licence, "token": token, "holdings": HoldingsOf(p),
+		"managed": managed, "registered": names}
+}
+
+func str(description string) map[string]any {
+	return map[string]any{"type": "string", "description": description}
+}
+
+// nodesOf reads the tools' `nodes` argument: absent is this node, "all" every node, else a list.
+func nodesOf(v any) []string {
+	s, _ := v.(string)
+	s = strings.TrimSpace(s)
+	switch s {
+	case "":
+		return nil
+	case "all":
+		return []string{"all"}
+	}
+	var out []string
+	for _, n := range strings.Split(s, ",") {
+		if n = strings.TrimSpace(n); n != "" {
+			out = append(out, n)
+		}
+	}
+	return out
+}
+
+func tools(p Paths, servers ServerState, view *ServerView) []stdio.Tool {
+	nodesArg := str(`more nodes: "all" for every node running claude-code, or a comma-separated list; absent is this node only`)
+	return []stdio.Tool{
+		{Name: "claude_code_status",
+			Description: "Claude Code on this machine as the mesh configured it: the licence it holds and when its token expires, what it reports holding, the managed files, the MCP servers registered here. Fingerprints only, never a token.",
+			Run:         func(map[string]any) (any, error) { return status(p), nil }},
+		{Name: "claude_code_render",
+			Description: "Write Claude Code's managed directory now, from the mesh's facts, this module's settings and the servers registered here.",
+			Run: func(map[string]any) (any, error) {
+				out, err := RenderNow(p, writeManaged)
+				return map[string]any{"rendered": out}, err
+			}},
+		{Name: "claude_code_pull",
+			Description: "Ask the licence manager for this node's current token now and apply it, rather than waiting for its binding to change.",
+			Run:         func(map[string]any) (any, error) { return Pull(p, ask, writeManaged) }},
+		{Name: "claude_code_grant",
+			Description: "For the licence manager (ADR 0206): the full grant in this node's credentials file — a login made here — sealed to the public key given, with the account it belongs to. Nothing when no login is waiting. Never answers a token in the clear.",
+			Input:       map[string]any{"public_key": str("the manager's public key, PEM; the grant opens only with its private half")},
+			Run: func(a map[string]any) (any, error) {
+				key, _ := a["public_key"].(string)
+				if !strings.Contains(key, "PUBLIC KEY") {
+					return nil, errors.New("claude_code_grant seals to a public key, and none was given")
+				}
+				return GrantFor(p, key)
+			}},
+		{Name: "claude_code_mcp_list",
+			Description: "The MCP servers registered through this module: those that apply on this node (beside the console, `mesh`, and those set in the module's settings), and every registration on the mesh, by key — `all.<server>` for every node, `<node>.<server>` for one.",
+			Run: func(map[string]any) (any, error) {
+				keys, err := servers.Keys()
+				return map[string]any{"here": Registered(p), "everywhere": keys}, err
+			}},
+		{Name: "claude_code_mcp_register",
+			Description: "Register an MCP server with Claude Code on this node, every node, or a list — an http/sse server by url, or a stdio server by command. Kept on the bus, so a node that joins later takes it too. Never put a secret in env or headers: the mesh refuses one.",
+			Input: map[string]any{
+				"name":    str("the server's name: letters, digits, - and _"),
+				"type":    str("http, sse or stdio (default stdio when a command is given, http when a url is)"),
+				"url":     str("an http or sse server's url"),
+				"command": str("a stdio server's program"),
+				"args":    map[string]any{"type": "array", "description": "a stdio server's arguments"},
+				"env":     map[string]any{"type": "object", "description": "a stdio server's environment"},
+				"headers": map[string]any{"type": "object", "description": "an http server's headers"},
+				"nodes":   nodesArg,
+			},
+			Run: func(a map[string]any) (any, error) {
+				entry := map[string]any{}
+				if t, _ := a["type"].(string); t != "" {
+					entry["type"] = t
+				} else if _, hasURL := a["url"]; hasURL {
+					entry["type"] = "http"
+				} else {
+					entry["type"] = "stdio"
+				}
+				for _, k := range []string{"url", "command", "args", "env", "headers"} {
+					if v, ok := a[k]; ok {
+						entry[k] = v
+					}
+				}
+				name, _ := a["name"].(string)
+				return RegisterServer(p, Registration{Name: name, Entry: entry, Nodes: nodesOf(a["nodes"])}, servers, view, writeManaged, nodesRunningMe)
+			}},
+		{Name: "claude_code_mcp_unregister",
+			Description: "Remove an MCP server registered through this module, on this node or more.",
+			Input:       map[string]any{"name": str("the server's name"), "nodes": nodesArg},
+			Run: func(a map[string]any) (any, error) {
+				name, _ := a["name"].(string)
+				return RegisterServer(p, Registration{Name: name, Nodes: nodesOf(a["nodes"])}, servers, view, writeManaged, nodesRunningMe)
+			}},
+	}
+}
+
+// persist asks the state again until it answers: its bucket or the bus's grant may arrive after the module.
+func persist(what string, attempt func() error, done func(refusals int)) {
+	waits := []time.Duration{2 * time.Second, 5 * time.Second, 10 * time.Second, 30 * time.Second}
+	for n := 0; ; n++ {
+		err := attempt()
+		if err == nil {
+			done(n)
+			return
+		}
+		pause := time.Minute
+		if n < len(waits) {
+			pause = waits[n]
+		}
+		say("%s not yet (%v); asking again in %s", what, err, pause)
+		time.Sleep(pause)
+	}
+}
+
+func main() {
+	p, launched := PathsFrom(os.Getenv)
+	if !launched {
+		// Outside a launch — a build, a check — it serves nothing and says why.
+		say("not launched by the runtime with this module's words; serving no tools")
+		if err := stdio.Serve("", nil); err != nil {
+			os.Exit(1)
+		}
+		return
+	}
+	if _, err := Keypair(p); err != nil {
+		say("this module's key: %v", err)
+	}
+	if out, err := RenderNow(p, writeManaged); err != nil {
+		say("%v", err)
+	} else {
+		for _, line := range out {
+			if !strings.HasSuffix(line, "unchanged") {
+				say("%s", line)
+			}
+		}
+	}
+	servers := stateOf{stdio.State("servers")}
+	view := NewServerView(p)
+	go run(p, view)
+	if err := stdio.Serve("", tools(p, servers, view)); err != nil {
+		say("%v", err)
+		os.Exit(1)
+	}
+}
+
+// run is the module's long-running half, beside the tools (ADR 0198).
+func run(p Paths, view *ServerView) {
+	// Every node's MCP servers: the whole current set first, then each change (ADR 0201).
+	go persist("watching the MCP servers", func() error {
+		return stdio.State("servers").Watch("", func(c stdio.StateChange) error {
+			var value map[string]any
+			_ = json.Unmarshal(c.Value, &value)
+			if done, err := OnServerChange(view, ServerChange{Key: c.Key, Op: c.Op, Value: value}, p, writeManaged); err != nil {
+				say("taking %s %s: %v", c.Op, c.Key, err) // the view took it; the next render writes it
+			} else if done != "" {
+				say("%s", done)
+			}
+			return nil
+		})
+	}, func(n int) { say("watching the MCP servers%s", refusals(n)) })
+
+	// What this node holds (ADR 0206): at start — a node already logged in is reported at once — and on
+	// every change of the credentials file, polled, because the file is replaced by rename and a watch on
+	// the old inode would go quiet. Fingerprints and expiries only.
+	holdings := stdio.State("holdings")
+	reported := ""
+	report := func() {
+		now := HoldingsOf(p)
+		raw, _ := json.Marshal(now)
+		if string(raw) == reported {
+			return
+		}
+		persist("reporting what this node holds", func() error { _, err := holdings.Put(p.Node, now); return err }, func(int) {
+			reported = string(raw)
+			account := "no account"
+			if now.Identity != nil && now.Identity.EmailAddress != "" {
+				account = now.Identity.EmailAddress
+			}
+			line := "reported: " + account
+			if now.Kind != nil {
+				line += ", " + *now.Kind
+			}
+			if now.Refresh.Present {
+				line += ", a login waiting"
+			}
+			if now.Licence != nil {
+				line += fmt.Sprintf(", licence %s g%d", *now.Licence, now.Generation)
+			}
+			say("%s", line)
+		})
+	}
+
+	// What this node should hold (ADR 0206): the manager's `bindings` key for this node; a newer
+	// generation is fetched with the seat's `current`, sealed to this module's key.
+	go persist("watching this node's licence binding", func() error {
+		return stdio.State(Manager+".bindings").Watch(p.Node, func(c stdio.StateChange) error {
+			if c.Key != p.Node {
+				return nil
+			}
+			var b *BindingState
+			if c.Op == "put" {
+				b = &BindingState{}
+				if err := json.Unmarshal(c.Value, b); err != nil {
+					return nil
+				}
+			}
+			if done, err := OnBinding(p, b, ask, writeManaged); err != nil {
+				say("fetching this node's token failed: %v", err)
+			} else if done != "" {
+				say("%s", done)
+			}
+			go report()
+			return nil
+		})
+	}, func(n int) { say("watching this node's licence binding%s", refusals(n)) })
+
+	report()
+	var last string
+	for range time.Tick(5 * time.Second) {
+		info, err := os.Stat(p.credentials())
+		now := "absent"
+		if err == nil {
+			now = fmt.Sprintf("%d/%d", info.ModTime().UnixNano(), info.Size())
+		}
+		if now != last {
+			last = now
+			report()
+		}
+	}
+}
+
+func refusals(n int) string {
+	if n == 0 {
+		return ""
+	}
+	return fmt.Sprintf(" (after %d refusal(s))", n)
+}

modules/claude-code/cmd/claude-code/node.go

@@ -0,0 +1,529 @@
+package main
+
+// What claude-code does on a node, written against what it is handed — a way to ask a tool on the bus, its
+// own state, a way to write a managed file — so every path is tested without a bus (novox/hq design 36,
+// ADR 0183, ADR 0201, ADR 0206).
+//
+// Over NATS, and nothing an event: what is current is state, and a secret only ever travels on a request,
+// sealed to its one recipient.
+//   - What this node holds is the module's `holdings` state, one key per node: the account, the kind,
+//     fingerprints and expiries — never a token. Written at start and on every change of the credentials
+//     file, so the licence manager learns a login, or a node already logged in, from the state alone.
+//   - The grant itself leaves only when the manager asks `claude_code_grant`, sealed to the key it gives.
+//   - What this node should hold is the manager's `bindings` state; a newer generation for this node is
+//     fetched with the seat's `current` verb, sealed to this module's key, and written access-token-only.
+//   - An MCP server registered through this module is a key in its `servers` state — `all.<server>` for
+//     every node, `<node>.<server>` for one — which every node watches.
+
+import (
+	"crypto/sha256"
+	"encoding/hex"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+	"sort"
+	"strings"
+	"sync"
+	"time"
+)
+
+// Seat is the licence manager's role, and Manager the module whose `bindings` state this one reads.
+const (
+	Seat    = "anthropic-licence-manager"
+	Manager = "claude-licence-manager"
+)
+
+// SeatVerb is a seat's verb as the runtime addresses it: a role, not a module.
+func SeatVerb(verb string) string { return "seat:" + Seat + "." + verb }
+
+// Fingerprint names a token without being one: the first 16 hex of its SHA-256, as the manager computes it.
+func Fingerprint(s string) string {
+	sum := sha256.Sum256([]byte(s))
+	return "sha256:" + hex.EncodeToString(sum[:])[:16]
+}
+
+// Paths are where this node's files are, from the module's words (ADR 0192).
+type Paths struct {
+	State, Facts, Settings, Home, Node string
+}
+
+// PathsFrom reads them, or answers false outside a launch.
+func PathsFrom(env func(string) string) (Paths, bool) {
+	p := Paths{State: env("MESH_CLAUDE_CODE_STATE"), Facts: env("MESH_CLAUDE_CODE_FACTS"),
+		Settings: env("MESH_CLAUDE_CODE_SETTINGS"), Home: env("MESH_OPERATOR_HOME"), Node: env("MESH_NODE")}
+	return p, p.State != "" && p.Facts != "" && p.Settings != "" && p.Home != "" && p.Node != ""
+}
+
+func (p Paths) credentials() string { return filepath.Join(p.Home, ".claude", ".credentials.json") }
+func (p Paths) account() string     { return filepath.Join(p.Home, ".claude.json") }
+func (p Paths) binding() string     { return filepath.Join(p.State, "licence.json") }
+func (p Paths) apiKey() string      { return filepath.Join(p.State, "api-key") }
+func (p Paths) helper() string      { return filepath.Join(p.State, "api-key-helper") }
+func (p Paths) registry() string    { return filepath.Join(p.State, "mcp-servers.json") }
+
+// Ask is a tool on the bus: its address and arguments in, its JSON answer out.
+type Ask func(address string, args any) (json.RawMessage, error)
+
+// WriteManaged writes one managed file and answers what happened.
+type WriteManaged func(name, content string) (string, error)
+
+func readJSON(path string, into any) bool {
+	raw, err := os.ReadFile(path)
+	return err == nil && json.Unmarshal(raw, into) == nil
+}
+
+// Keypair is this module's own, made once in its state; the TypeScript module's files are kept, so a node
+// moving to this binary keeps the key it had.
+func Keypair(p Paths) (KeyPair, error) {
+	priv, pub := filepath.Join(p.State, "key.pem"), filepath.Join(p.State, "key.pub.pem")
+	if _, err := os.Stat(priv); errors.Is(err, os.ErrNotExist) {
+		k, err := GenerateKeyPair()
+		if err != nil {
+			return KeyPair{}, err
+		}
+		if err := os.WriteFile(priv, []byte(k.PrivateKey), 0o600); err != nil {
+			return KeyPair{}, err
+		}
+		if err := os.WriteFile(pub, []byte(k.PublicKey), 0o644); err != nil {
+			return KeyPair{}, err
+		}
+	}
+	a, err1 := os.ReadFile(priv)
+	b, err2 := os.ReadFile(pub)
+	return KeyPair{PrivateKey: string(a), PublicKey: string(b)}, errors.Join(err1, err2)
+}
+
+// Registered is what applies here of the servers registered through this module.
+func Registered(p Paths) Servers {
+	s := Servers{}
+	readJSON(p.registry(), &s)
+	return s
+}
+
+// RenderNow writes the managed directory from the facts, the settings, the licence held and the servers
+// registered here.
+func RenderNow(p Paths, write WriteManaged) ([]string, error) {
+	var facts Facts
+	if !readJSON(p.Facts, &facts) || facts.Console == "" {
+		return nil, fmt.Errorf("the mesh has not rendered %s yet; nothing to write", p.Facts)
+	}
+	var settings Settings
+	readJSON(p.Settings, &settings)
+	var binding *Binding
+	var b Binding
+	if readJSON(p.binding(), &b) {
+		binding = &b
+	}
+	files := Render(facts, settings, binding, p.helper(), Registered(p))
+	names := make([]string, 0, len(files))
+	for n := range files {
+		names = append(names, n)
+	}
+	sort.Strings(names)
+	var out []string
+	for _, n := range names {
+		line, err := write(n, files[n])
+		if err != nil {
+			return out, err
+		}
+		out = append(out, line)
+	}
+	return out, nil
+}
+
+// ---- the licence ----------------------------------------------------------------------------------
+
+// BindingState is what the manager's `bindings` state says one consumer should hold (ADR 0206).
+type BindingState struct {
+	Licence    string `json:"licence"`
+	Kind       string `json:"kind"`
+	Generation int64  `json:"generation"`
+}
+
+// Current is what the seat answers to `current`: the licence this node is bound to and its token, sealed.
+type Current struct {
+	Licence    string     `json:"licence"`
+	Kind       string     `json:"kind"`
+	Generation int64      `json:"generation"`
+	Sealed     *SealedBox `json:"sealed"`
+	Identity   *Identity  `json:"identity"`
+}
+
+// Holdings is what this node holds, as the `holdings` state carries it (ADR 0206): enough for the manager
+// to tell a login it has not adopted from one it has, and never a token — fingerprints and expiries only.
+type Holdings struct {
+	Node     string    `json:"node"`
+	Identity *Identity `json:"identity"`
+	Kind     *string   `json:"kind"`
+	Refresh  struct {
+		Present     bool    `json:"present"`
+		Fingerprint *string `json:"fingerprint"`
+		ExpiresAt   *int64  `json:"expiresAt"`
+	} `json:"refresh"`
+	Access *struct {
+		Fingerprint string `json:"fingerprint"`
+		ExpiresAt   int64  `json:"expiresAt"`
+	} `json:"access"`
+	Licence    *string `json:"licence"`
+	Generation int64   `json:"generation"`
+	ChangedAt  *string `json:"changedAt"`
+}
+
+// HoldingsOf is what this node holds now.
+func HoldingsOf(p Paths) Holdings {
+	h := Holdings{Node: p.Node, Identity: ReadIdentity(p.account())}
+	creds := ReadCredentials(p.credentials())
+	if info, err := os.Stat(p.credentials()); err == nil {
+		at := info.ModTime().UTC().Format("2006-01-02T15:04:05.000Z")
+		h.ChangedAt = &at
+	}
+	if rt := RefreshTokenOf(creds); rt != "" {
+		fp := Fingerprint(rt)
+		h.Refresh.Present, h.Refresh.Fingerprint = true, &fp
+	}
+	if v, ok := number(creds.oauth()["refreshTokenExpiresAt"]); ok {
+		h.Refresh.ExpiresAt = &v
+	}
+	if g := GrantOf(creds); g != nil {
+		h.Access = &struct {
+			Fingerprint string `json:"fingerprint"`
+			ExpiresAt   int64  `json:"expiresAt"`
+		}{Fingerprint(g.AccessToken), g.ExpiresAt}
+	}
+	kind := ""
+	if _, err := os.Stat(p.apiKey()); err == nil {
+		kind = "api-key"
+	} else if h.Access != nil {
+		kind = "subscription"
+	}
+	if kind != "" {
+		h.Kind = &kind
+	}
+	var applied Binding
+	if readJSON(p.binding(), &applied) && applied.Licence != "" {
+		h.Licence, h.Generation = &applied.Licence, applied.Generation
+	}
+	return h
+}
+
+// GrantAnswer is what `claude_code_grant` answers: a login sealed to the key given, or nothing waiting.
+type GrantAnswer struct {
+	Sealed      *SealedBox `json:"sealed,omitempty"`
+	Identity    *Identity  `json:"identity,omitempty"`
+	Fingerprint string     `json:"fingerprint,omitempty"`
+	Waiting     *bool      `json:"waiting,omitempty"`
+}
+
+// GrantFor is the full grant in the credentials file sealed to the manager's key — the one time a refresh
+// token leaves this node, for the manager to adopt by refreshing it (ADR 0206). Nothing waiting when the
+// file holds no refresh token.
+func GrantFor(p Paths, managerPublicKey string) (GrantAnswer, error) {
+	creds := ReadCredentials(p.credentials())
+	rt := RefreshTokenOf(creds)
+	if rt == "" {
+		no := false
+		return GrantAnswer{Waiting: &no}, nil
+	}
+	raw, err := json.Marshal(creds.oauth())
+	if err != nil {
+		return GrantAnswer{}, err
+	}
+	box, err := Seal(string(raw), managerPublicKey)
+	if err != nil {
+		return GrantAnswer{}, err
+	}
+	return GrantAnswer{Sealed: &box, Identity: ReadIdentity(p.account()), Fingerprint: Fingerprint(rt)}, nil
+}
+
+// Pull asks the seat for this node's current token and applies it.
+func Pull(p Paths, ask Ask, write WriteManaged) (map[string]any, error) {
+	keys, err := Keypair(p)
+	if err != nil {
+		return nil, err
+	}
+	raw, err := ask(SeatVerb("current"), map[string]any{"consumer": p.Node, "public_key": keys.PublicKey})
+	if err != nil {
+		return nil, err
+	}
+	var c Current
+	if err := json.Unmarshal(raw, &c); err != nil || c.Sealed == nil {
+		return map[string]any{"applied": false, "reason": "the seat holds no licence for this node"}, nil
+	}
+	return Apply(p, c, write)
+}
+
+// OnBinding takes a change to this node's key in the manager's `bindings` state (ADR 0206): the token is
+// fetched when the generation is newer than the one applied. A released binding keeps the last token,
+// which lives hours, and says so.
+func OnBinding(p Paths, b *BindingState, ask Ask, write WriteManaged) (string, error) {
+	if b == nil {
+		return "this node's binding was released; it keeps its last token until it expires", nil
+	}
+	var applied Binding
+	if readJSON(p.binding(), &applied) && applied.Generation >= b.Generation {
+		return "", nil
+	}
+	out, err := Pull(p, ask, write)
+	if err != nil {
+		return "", err
+	}
+	raw, _ := json.Marshal(out)
+	return string(raw), nil
+}
+
+// Apply applies what the seat handed over. A switch replaces the grant whole and cleans up after the old
+// licence; whatever it is, the file is written without a refresh token, so the agent here never refreshes.
+func Apply(p Paths, c Current, write WriteManaged) (map[string]any, error) {
+	keys, err := Keypair(p)
+	if err != nil {
+		return nil, err
+	}
+	plain, err := Open(*c.Sealed, keys.PrivateKey)
+	if err != nil {
+		return nil, err
+	}
+	var previous Binding
+	had := readJSON(p.binding(), &previous)
+	switched := !had || previous.Licence != c.Licence
+	out := map[string]any{"applied": true, "licence": c.Licence, "kind": c.Kind, "switched": switched}
+	if c.Kind == "api-key" {
+		if err := os.WriteFile(p.apiKey(), []byte(strings.TrimSpace(plain)+"\n"), 0o600); err != nil {
+			return nil, err
+		}
+		if err := os.WriteFile(p.helper(), []byte("#!/bin/sh\nexec cat '"+p.apiKey()+"'\n"), 0o700); err != nil {
+			return nil, err
+		}
+		_ = os.Chmod(p.helper(), 0o700)
+	} else {
+		var g Grant
+		if err := json.Unmarshal([]byte(plain), &g); err != nil {
+			return nil, err
+		}
+		local := ReadCredentials(p.credentials())
+		// A login waiting here was handed to the manager first (ADR 0206): what comes back is its successor,
+		// and the refresh token in the file is the one the manager just spent.
+		d := DecideApply(GrantOf(local), g, switched || HoldsLogin(local))
+		if d.Apply {
+			next := WithGrant(local, g)
+			if switched {
+				next = ReplacedBy(local, g)
+			}
+			if err := WriteCredentials(p.credentials(), next); err != nil {
+				return nil, err
+			}
+		} else {
+			out = map[string]any{"applied": false, "licence": c.Licence, "reason": d.Reason}
+		}
+		// Away from the API key: it goes, with its helper.
+		_ = os.Remove(p.apiKey())
+		_ = os.Remove(p.helper())
+	}
+	if switched && c.Identity != nil && c.Identity.AccountUUID != "" {
+		changed, err := WriteIdentity(p.account(), *c.Identity)
+		if err == nil {
+			out["account"] = map[bool]string{true: "updated", false: "unchanged"}[changed]
+		}
+	}
+	gen := c.Generation
+	if gen == 0 {
+		gen = previous.Generation
+	}
+	raw, _ := json.Marshal(Binding{Licence: c.Licence, Kind: c.Kind, Generation: gen})
+	if err := os.WriteFile(p.binding(), append(raw, '\n'), 0o600); err != nil {
+		return nil, err
+	}
+	// The key-helper comes or goes with the licence's kind.
+	if rendered, err := RenderNow(p, write); err != nil {
+		out["rendered"] = map[string]any{"failed": err.Error()}
+	} else {
+		out["rendered"] = rendered
+	}
+	return out, nil
+}
+
+// ---- MCP servers ----------------------------------------------------------------------------------
+
+// Registration is a server registered (or, with no entry, unregistered) through this module.
+type Registration struct {
+	Name  string
+	Entry map[string]any
+	// Nodes: nil for this node, ["all"] for every node running the module, or a list.
+	Nodes []string
+}
+
+// ServerState is the `servers` state as this module reaches it through the runtime.
+type ServerState interface {
+	Put(key string, value any) error
+	Delete(key string) error
+	Keys() ([]string, error)
+}
+
+// ServerChange is one change to the `servers` state, as a watch hands it over.
+type ServerChange struct {
+	Key   string
+	Op    string // put | delete
+	Value map[string]any
+}
+
+// KeyOf is the key a registration lives at: `all.<server>` for every node, `<node>.<server>` for one.
+func KeyOf(scope, name string) string { return scope + "." + name }
+
+// ServerView is what this node takes from the `servers` state: the entries for every node and for this
+// one, kept in memory from the watch and written through to the module's own file whenever what applies
+// here changes, so the managed directory renders without the bus.
+type ServerView struct {
+	p       Paths
+	mu      sync.Mutex
+	entries map[string]map[string]any
+}
+
+// NewServerView is an empty view for this node.
+func NewServerView(p Paths) *ServerView {
+	return &ServerView{p: p, entries: map[string]map[string]any{}}
+}
+
+// Take takes one change, and answers whether what applies to this node changed.
+func (v *ServerView) Take(c ServerChange) bool {
+	scope, name, ok := strings.Cut(c.Key, ".")
+	if !ok || scope == "" || (scope != "all" && scope != v.p.Node) {
+		return false
+	}
+	v.mu.Lock()
+	if c.Op == "put" && c.Value != nil && EntryProblem(name, c.Value) == "" {
+		v.entries[c.Key] = c.Value
+	} else {
+		delete(v.entries, c.Key)
+	}
+	v.mu.Unlock()
+	return v.writeThrough()
+}
+
+// Effective is what applies here: every node's entries, with this node's own laid over them by name.
+func (v *ServerView) Effective() Servers {
+	v.mu.Lock()
+	defer v.mu.Unlock()
+	out := Servers{}
+	for _, scope := range []string{"all", v.p.Node} {
+		for key, entry := range v.entries {
+			if name, ok := strings.CutPrefix(key, scope+"."); ok {
+				out[name] = entry
+			}
+		}
+	}
+	return out
+}
+
+func (v *ServerView) writeThrough() bool {
+	now, _ := indented(v.Effective())
+	before, _ := os.ReadFile(v.p.registry())
+	if string(before) == string(now) {
+		return false
+	}
+	_ = os.WriteFile(v.p.registry(), now, 0o600)
+	return true
+}
+
+// OnServerChange takes a change from the watch, and renders when what applies here changed.
+func OnServerChange(v *ServerView, c ServerChange, p Paths, write WriteManaged) (string, error) {
+	if !v.Take(c) {
+		return "", nil
+	}
+	if _, err := RenderNow(p, write); err != nil {
+		return "", err
+	}
+	what := "registered"
+	if c.Op != "put" {
+		what = "unregistered"
+	}
+	return what + " " + c.Key, nil
+}
+
+// RegisterServer registers (or, with no entry, unregisters) a server: a put (or delete) per scope in the
+// `servers` state, taken into this node's view at once so the answer says what it did here; every other
+// node takes it from its watch, and a node that joins later from the current state.
+func RegisterServer(p Paths, r Registration, servers ServerState, v *ServerView, write WriteManaged,
+	others func() ([]string, error)) (map[string]any, error) {
+	if r.Entry != nil {
+		if problem := EntryProblem(r.Name, r.Entry); problem != "" {
+			return map[string]any{"registered": false, "reason": problem}, nil
+		}
+	}
+	scopes := r.Nodes
+	if len(scopes) == 0 {
+		scopes = []string{p.Node}
+	}
+	// Compared before and after rather than read from Take: this node's own watch may hand the view the
+	// same change first, and then Take here finds nothing new although this call made it.
+	before, _ := json.Marshal(v.Effective())
+	for _, scope := range scopes {
+		key := KeyOf(scope, r.Name)
+		var err error
+		if r.Entry != nil {
+			err = servers.Put(key, r.Entry)
+		} else {
+			err = servers.Delete(key)
+		}
+		if err != nil {
+			return nil, err
+		}
+		op := "put"
+		if r.Entry == nil {
+			op = "delete"
+		}
+		v.Take(ServerChange{Key: key, Op: op, Value: r.Entry})
+	}
+	after, _ := json.Marshal(v.Effective())
+	changed := string(before) != string(after)
+	here := false
+	for _, s := range scopes {
+		here = here || s == "all" || s == p.Node
+	}
+	verb := "registered"
+	if r.Entry == nil {
+		verb = "unregistered"
+	}
+	answer := map[string]any{verb: r.Name, "on": scopes}
+	switch {
+	case !here:
+		answer["here"] = "not this node"
+	case changed:
+		answer["here"] = "changed"
+	default:
+		answer["here"] = "already so"
+	}
+	if changed {
+		rendered, err := RenderNow(p, write)
+		if err != nil {
+			return nil, err
+		}
+		answer["rendered"] = rendered
+	}
+	if r.Entry == nil {
+		if _, still := v.Effective()[r.Name]; still {
+			answer["still"] = r.Name + " still applies here from another registration (for every node, or for this one); unregister that too"
+		}
+	}
+	if len(r.Nodes) == 0 {
+		// The question the operator wanted asked: here only, or more?
+		var elsewhere []string
+		if nodes, err := others(); err == nil {
+			for _, n := range nodes {
+				if n != p.Node {
+					elsewhere = append(elsewhere, n)
+				}
+			}
+		}
+		if len(elsewhere) > 0 {
+			answer["also"] = fmt.Sprintf("claude-code also runs on %s. To %s it there too, call again with nodes: \"all\" or a list of those nodes.",
+				strings.Join(elsewhere, ", "), map[bool]string{true: "register", false: "unregister"}[r.Entry != nil])
+		} else {
+			answer["also"] = "To do the same on every node running claude-code, call again with nodes: \"all\"."
+		}
+	}
+	return answer, nil
+}
+
+// stamp is a time as the status answers it.
+func stamp(ms int64) string { return time.UnixMilli(ms).UTC().Format(time.RFC3339) }

modules/claude-code/cmd/claude-code/render.go

@@ -0,0 +1,121 @@
+package main
+
+// What the module writes into the agent's machine-wide managed directory (novox/hq design 36 §1–§4).
+// Pure: composed from the facts the mesh rendered, the settings the operator set and the licence the node
+// holds, so what lands under /etc is tested without a machine.
+//
+// Three files, owned whole by this module:
+//
+//	managed-mcp.json        the tool servers every session loads: the mesh's console as `mesh`, and the
+//	                        servers the operator declared or registered through this module. Exclusive by
+//	                        the vendor's rule — a server not listed here does not load (operator's choice,
+//	                        2026-10-03).
+//	managed-settings.json   the mesh's keys only: the repositories' attribution convention, the claude.ai
+//	                        connectors kept beside the managed servers, and — for an API-key licence only —
+//	                        the key-helper. A person's preferences are theirs.
+//	CLAUDE.md               how a session on this mesh works, who this node is, the conventions.
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"regexp"
+	"strings"
+)
+
+// ManagedDir is the agent's machine-wide managed directory.
+const ManagedDir = "/etc/claude-code"
+
+const meshEntry = "mesh"
+
+// Facts are what the mesh rendered for this node.
+type Facts struct {
+	Node    string `json:"node"`
+	Console string `json:"console"`
+}
+
+// Settings are the operator's, for the mesh or this node.
+type Settings struct {
+	Role       string                    `json:"role"`
+	MCPServers map[string]map[string]any `json:"mcp_servers"`
+}
+
+// Binding is the licence this node holds, as it was last applied.
+type Binding struct {
+	Licence    string `json:"licence"`
+	Kind       string `json:"kind"` // subscription | api-key
+	Generation int64  `json:"generation,omitempty"`
+}
+
+// Servers are tool server entries by name, in the vendor's `.mcp.json` shape.
+type Servers map[string]map[string]any
+
+var serverName = regexp.MustCompile(`^[A-Za-z0-9_-]+$`)
+
+// EntryProblem says why the vendor's managed file would not take an entry, or "" when it would: a name of
+// letters, digits, `-` and `_`, and an http/sse server with a url or a stdio server with a command.
+func EntryProblem(name string, entry map[string]any) string {
+	if !serverName.MatchString(name) {
+		return fmt.Sprintf("%q is not a name the agent takes: letters, digits, - and _", name)
+	}
+	if name == meshEntry {
+		return fmt.Sprintf("%q is the mesh's own entry", meshEntry)
+	}
+	kind, _ := entry["type"].(string)
+	if kind == "" {
+		kind = "stdio"
+	}
+	switch kind {
+	case "http", "sse", "streamable-http":
+		if u, _ := entry["url"].(string); u != "" {
+			return ""
+		}
+		return fmt.Sprintf("an %s server needs a url", kind)
+	case "stdio":
+		if c, _ := entry["command"].(string); c != "" {
+			return ""
+		}
+		return "a stdio server needs a command"
+	}
+	return fmt.Sprintf("%q is not a server type the agent knows (http, sse, stdio)", kind)
+}
+
+// jsonFile is a value as the managed files are written: two-space indent, a trailing newline, nothing
+// escaped that need not be.
+func jsonFile(v any) string {
+	var b bytes.Buffer
+	enc := json.NewEncoder(&b)
+	enc.SetEscapeHTML(false)
+	enc.SetIndent("", "  ")
+	_ = enc.Encode(v)
+	return b.String()
+}
+
+// Render composes the three files. registered — what was registered through this module and applies
+// here — is laid over the servers the operator set in its settings.
+func Render(facts Facts, settings Settings, binding *Binding, helperPath string, registered Servers) map[string]string {
+	servers := map[string]any{}
+	for _, layer := range []map[string]map[string]any{settings.MCPServers, registered} {
+		for name, entry := range layer {
+			if EntryProblem(name, entry) != "" {
+				continue // the mesh's own entry, or one the agent would refuse
+			}
+			servers[name] = entry
+		}
+	}
+	servers[meshEntry] = map[string]any{"type": "http", "url": facts.Console}
+
+	managed := map[string]any{"attribution": map[string]any{"commit": "", "pr": ""}, "allowAllClaudeAiMcps": true}
+	if binding != nil && binding.Kind == "api-key" {
+		managed["apiKeyHelper"] = helperPath
+	}
+	role := strings.TrimSpace(settings.Role)
+	if role == "" {
+		role = "not stated — set it in this module's settings for the node"
+	}
+	return map[string]string{
+		"managed-mcp.json":      jsonFile(map[string]any{"mcpServers": servers}),
+		"managed-settings.json": jsonFile(managed),
+		"CLAUDE.md":             instructionsText(facts.Node, role),
+	}
+}

modules/claude-code/cmd/claude-code/seal.go

@@ -0,0 +1,189 @@
+package main
+
+// Sealing to one recipient (novox/hq ADR 0183, ADR 0206): the manager seals what it hands a consumer to
+// the key that consumer sent, and a node seals a waiting login to the key the manager gives. The same box
+// the agent module's TypeScript makes and opens, byte for byte — X25519 for the agreement, HKDF-SHA256 for
+// the key, AES-256-GCM for the box — so `testdata/sealed-by-typescript.json` is opened here, and a test
+// reopens what this seals with the same derivation.
+//
+// A box is `{ v: 1, eph, iv, tag, ct }`, every field base64; `eph` is the one-time public key as SPKI DER,
+// and the key is bound to it and to the recipient's raw public key, so a box cannot be re-addressed.
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/ecdh"
+	"crypto/hkdf"
+	"crypto/rand"
+	"crypto/sha256"
+	"crypto/x509"
+	"encoding/base64"
+	"encoding/pem"
+	"errors"
+	"fmt"
+)
+
+// SealedBox is a value sealed to one recipient.
+type SealedBox struct {
+	V   int    `json:"v"`
+	Eph string `json:"eph"`
+	IV  string `json:"iv"`
+	Tag string `json:"tag"`
+	Ct  string `json:"ct"`
+}
+
+// KeyPair is a recipient's keypair as the two PEM strings it is kept and sent as.
+type KeyPair struct {
+	PublicKey  string `json:"publicKey"`
+	PrivateKey string `json:"privateKey"`
+}
+
+const sealInfo = "novox-mesh sealed box v1"
+
+// GenerateKeyPair makes an X25519 keypair, PEM-encoded as the agent module's are.
+func GenerateKeyPair() (KeyPair, error) {
+	priv, err := ecdh.X25519().GenerateKey(rand.Reader)
+	if err != nil {
+		return KeyPair{}, err
+	}
+	pubDER, err := x509.MarshalPKIXPublicKey(priv.PublicKey())
+	if err != nil {
+		return KeyPair{}, err
+	}
+	privDER, err := x509.MarshalPKCS8PrivateKey(priv)
+	if err != nil {
+		return KeyPair{}, err
+	}
+	return KeyPair{
+		PublicKey:  string(pem.EncodeToMemory(&pem.Block{Type: "PUBLIC KEY", Bytes: pubDER})),
+		PrivateKey: string(pem.EncodeToMemory(&pem.Block{Type: "PRIVATE KEY", Bytes: privDER})),
+	}, nil
+}
+
+func publicFromPEM(p string) (*ecdh.PublicKey, error) {
+	block, _ := pem.Decode([]byte(p))
+	if block == nil {
+		return nil, errors.New("not a PEM public key")
+	}
+	k, err := x509.ParsePKIXPublicKey(block.Bytes)
+	if err != nil {
+		return nil, err
+	}
+	pub, ok := k.(*ecdh.PublicKey)
+	if !ok || pub.Curve() != ecdh.X25519() {
+		return nil, errors.New("not an X25519 public key")
+	}
+	return pub, nil
+}
+
+func privateFromPEM(p string) (*ecdh.PrivateKey, error) {
+	block, _ := pem.Decode([]byte(p))
+	if block == nil {
+		return nil, errors.New("not a PEM private key")
+	}
+	k, err := x509.ParsePKCS8PrivateKey(block.Bytes)
+	if err != nil {
+		return nil, err
+	}
+	priv, ok := k.(*ecdh.PrivateKey)
+	if !ok || priv.Curve() != ecdh.X25519() {
+		return nil, errors.New("not an X25519 private key")
+	}
+	return priv, nil
+}
+
+func boxKey(secret, ephDER, recipientRaw []byte) ([]byte, error) {
+	salt := append(append([]byte{}, ephDER...), recipientRaw...)
+	return hkdf.Key(sha256.New, secret, salt, sealInfo, 32)
+}
+
+// Seal seals plaintext to the recipient's public key.
+func Seal(plaintext, recipientPEM string) (SealedBox, error) {
+	recipient, err := publicFromPEM(recipientPEM)
+	if err != nil {
+		return SealedBox{}, err
+	}
+	eph, err := ecdh.X25519().GenerateKey(rand.Reader)
+	if err != nil {
+		return SealedBox{}, err
+	}
+	secret, err := eph.ECDH(recipient)
+	if err != nil {
+		return SealedBox{}, err
+	}
+	ephDER, err := x509.MarshalPKIXPublicKey(eph.PublicKey())
+	if err != nil {
+		return SealedBox{}, err
+	}
+	key, err := boxKey(secret, ephDER, recipient.Bytes())
+	if err != nil {
+		return SealedBox{}, err
+	}
+	gcm, err := newGCM(key)
+	if err != nil {
+		return SealedBox{}, err
+	}
+	iv := make([]byte, 12)
+	if _, err := rand.Read(iv); err != nil {
+		return SealedBox{}, err
+	}
+	out := gcm.Seal(nil, iv, []byte(plaintext), nil)
+	ct, tag := out[:len(out)-gcm.Overhead()], out[len(out)-gcm.Overhead():]
+	b64 := base64.StdEncoding.EncodeToString
+	return SealedBox{V: 1, Eph: b64(ephDER), IV: b64(iv), Tag: b64(tag), Ct: b64(ct)}, nil
+}
+
+// Open opens a box with the recipient's private key; it fails for a box to another key or one tampered with.
+func Open(box SealedBox, privatePEM string) (string, error) {
+	if box.V != 1 {
+		return "", errors.New("not a sealed box this module can open")
+	}
+	priv, err := privateFromPEM(privatePEM)
+	if err != nil {
+		return "", err
+	}
+	d := base64.StdEncoding.DecodeString
+	ephDER, err := d(box.Eph)
+	if err != nil {
+		return "", fmt.Errorf("the box's eph: %w", err)
+	}
+	ephKey, err := x509.ParsePKIXPublicKey(ephDER)
+	if err != nil {
+		return "", err
+	}
+	eph, ok := ephKey.(*ecdh.PublicKey)
+	if !ok {
+		return "", errors.New("the box's eph is not an X25519 key")
+	}
+	secret, err := priv.ECDH(eph)
+	if err != nil {
+		return "", err
+	}
+	key, err := boxKey(secret, ephDER, priv.PublicKey().Bytes())
+	if err != nil {
+		return "", err
+	}
+	iv, err1 := d(box.IV)
+	tag, err2 := d(box.Tag)
+	ct, err3 := d(box.Ct)
+	if err := errors.Join(err1, err2, err3); err != nil {
+		return "", err
+	}
+	gcm, err := newGCM(key)
+	if err != nil {
+		return "", err
+	}
+	plain, err := gcm.Open(nil, iv, append(ct, tag...), nil)
+	if err != nil {
+		return "", errors.New("the box does not open with this key")
+	}
+	return string(plain), nil
+}
+
+func newGCM(key []byte) (cipher.AEAD, error) {
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+	return cipher.NewGCM(block)
+}

modules/claude-code/cmd/claude-code/testdata/rendered-by-typescript.json

@@ -0,0 +1,42 @@
+{
+  "facts": {
+    "node": "workstation",
+    "console": "http://127.0.0.1:4270/mcp"
+  },
+  "settings": {
+    "role": "the laptop",
+    "mcp_servers": {
+      "search": {
+        "type": "http",
+        "url": "https://s.example/mcp"
+      },
+      "docs": {
+        "type": "stdio",
+        "command": "docs-mcp",
+        "args": [
+          "--x"
+        ]
+      }
+    }
+  },
+  "registered": {
+    "anton": {
+      "type": "stdio",
+      "command": "node",
+      "args": [
+        "/a/b.js"
+      ],
+      "env": {}
+    }
+  },
+  "withKey": {
+    "managed-mcp.json": "{\n  \"mcpServers\": {\n    \"anton\": {\n      \"type\": \"stdio\",\n      \"command\": \"node\",\n      \"args\": [\n        \"/a/b.js\"\n      ],\n      \"env\": {}\n    },\n    \"docs\": {\n      \"type\": \"stdio\",\n      \"command\": \"docs-mcp\",\n      \"args\": [\n        \"--x\"\n      ]\n    },\n    \"mesh\": {\n      \"type\": \"http\",\n      \"url\": \"http://127.0.0.1:4270/mcp\"\n    },\n    \"search\": {\n      \"type\": \"http\",\n      \"url\": \"https://s.example/mcp\"\n    }\n  }\n}\n",
+    "managed-settings.json": "{\n  \"attribution\": {\n    \"commit\": \"\",\n    \"pr\": \"\"\n  },\n  \"allowAllClaudeAiMcps\": true,\n  \"apiKeyHelper\": \"/state/api-key-helper\"\n}\n",
+    "CLAUDE.md": "# This machine is a node of a Novox mesh\n\nWritten by the mesh's `claude-code` module. Edit the module's settings or the catalogue, never this file:\nit is rewritten whenever the module renders.\n\n## Who this node is\n\n- **Node:** `workstation`\n- **Role:** the laptop\n- The other nodes, their roles and what runs where: ask the controller (`mesh-controller.nodes`,\n  `mesh-controller.node`). Nothing here lists them, because a copy drifts.\n\n## How a session on this mesh works\n\nThe console is the only way to the mesh: the MCP server named `mesh`. It offers five tools, and\neverything else is an address you find and call through them:\n\n- `mesh_search` — words in, matching addresses out. `mesh_describe` — one address's arguments.\n- `mesh_call` — call an address. A seat the mesh holds once is `<seat>.<verb>` (the mesh's own verbs\n  are `mesh-controller.<verb>`: `status`, `plan`, `node`, `assign`, `push`, `settings`);\n  a module on a machine is `<node>/<module>.<tool>`.\n- `mesh_overview` and `mesh_machine` — the mesh's seats and machines, and what one machine runs.\n\n- **Symptom first.** For an error, a failing service or anything unexpected, search the record with the\n  literal text before forming a hypothesis: the records module's `records_search`, then\n  `records_read`.\n- **Ask the mesh before changing it**, and change it through the controller's verbs or the catalogue.\n- **A licence** through the `anthropic-licence-manager` seat's verbs. Never edit the agent's credentials\n  file by hand, never print or ask for a token.\n\n## Hard rules\n\n- A file the mesh manages is changed through the verb or the catalogue that owns it, never on disk. If\n  unsure, `mesh-controller.plan` for the node says what the mesh writes there.\n- Never write to a store's database by hand; schema changes are numbered migrations.\n- Never push to a main branch: a branch, a pull request, and a human approval for every merge.\n- The mesh creates no symlinks, and nobody else does either.\n- A package is declared in a module, never installed by hand.\n\n## Conventions\n\n- Commit messages are concise, in the imperative, about why.\n- Test before pushing: nodes update unattended.\n- The playbooks in the record say how research, decisions, designs, issues and hand-offs are done.\n"
+  },
+  "plain": {
+    "managed-mcp.json": "{\n  \"mcpServers\": {\n    \"mesh\": {\n      \"type\": \"http\",\n      \"url\": \"http://127.0.0.1:4270/mcp\"\n    }\n  }\n}\n",
+    "managed-settings.json": "{\n  \"attribution\": {\n    \"commit\": \"\",\n    \"pr\": \"\"\n  },\n  \"allowAllClaudeAiMcps\": true\n}\n",
+    "CLAUDE.md": "# This machine is a node of a Novox mesh\n\nWritten by the mesh's `claude-code` module. Edit the module's settings or the catalogue, never this file:\nit is rewritten whenever the module renders.\n\n## Who this node is\n\n- **Node:** `workstation`\n- **Role:** not stated — set it in this module's settings for the node\n- The other nodes, their roles and what runs where: ask the controller (`mesh-controller.nodes`,\n  `mesh-controller.node`). Nothing here lists them, because a copy drifts.\n\n## How a session on this mesh works\n\nThe console is the only way to the mesh: the MCP server named `mesh`. It offers five tools, and\neverything else is an address you find and call through them:\n\n- `mesh_search` — words in, matching addresses out. `mesh_describe` — one address's arguments.\n- `mesh_call` — call an address. A seat the mesh holds once is `<seat>.<verb>` (the mesh's own verbs\n  are `mesh-controller.<verb>`: `status`, `plan`, `node`, `assign`, `push`, `settings`);\n  a module on a machine is `<node>/<module>.<tool>`.\n- `mesh_overview` and `mesh_machine` — the mesh's seats and machines, and what one machine runs.\n\n- **Symptom first.** For an error, a failing service or anything unexpected, search the record with the\n  literal text before forming a hypothesis: the records module's `records_search`, then\n  `records_read`.\n- **Ask the mesh before changing it**, and change it through the controller's verbs or the catalogue.\n- **A licence** through the `anthropic-licence-manager` seat's verbs. Never edit the agent's credentials\n  file by hand, never print or ask for a token.\n\n## Hard rules\n\n- A file the mesh manages is changed through the verb or the catalogue that owns it, never on disk. If\n  unsure, `mesh-controller.plan` for the node says what the mesh writes there.\n- Never write to a store's database by hand; schema changes are numbered migrations.\n- Never push to a main branch: a branch, a pull request, and a human approval for every merge.\n- The mesh creates no symlinks, and nobody else does either.\n- A package is declared in a module, never installed by hand.\n\n## Conventions\n\n- Commit messages are concise, in the imperative, about why.\n- Test before pushing: nodes update unattended.\n- The playbooks in the record say how research, decisions, designs, issues and hand-offs are done.\n"
+  }
+}

modules/claude-code/go.mod

@@ -0,0 +1,5 @@
+module claude-code
+
+go 1.25.0
+
+require git.novox.be/novox/mesh-sdk/go v0.1.7

modules/claude-code/go.sum

@@ -0,0 +1,2 @@
+git.novox.be/novox/mesh-sdk/go v0.1.7 h1:C0sTQmtTiyYH7bnqZb7PusXnqA37gKuT7Nqjn9gG47w=
+git.novox.be/novox/mesh-sdk/go v0.1.7/go.mod h1:GFuZUElBZ9A++mxgIKo97aXXo+kV0uJ/UkbhQPPIbrY=

modules/claude-code/module.json

@@ -0,0 +1,94 @@
+{
+  "module": "claude-code",
+  "version": "1",
+  "slug": "agent",
+  "capabilities": [
+    "package-manager"
+  ],
+  "requires": [
+    "mcp-endpoint"
+  ],
+  "binds": {
+    "mcp-endpoint": "${dir:state}/mcp-endpoint.json"
+  },
+  "state": [
+    "servers",
+    "holdings"
+  ],
+  "reads": [
+    "claude-licence-manager.bindings"
+  ],
+  "tools": [
+    "claude_code_status",
+    "claude_code_render",
+    "claude_code_pull",
+    "claude_code_grant",
+    "claude_code_mcp_list",
+    "claude_code_mcp_register",
+    "claude_code_mcp_unregister"
+  ],
+  "resources": [
+    {
+      "id": "package",
+      "type": "package",
+      "package": "claude-code"
+    },
+    {
+      "id": "managed",
+      "type": "directory",
+      "path": "/etc/claude-code",
+      "mode": "0755"
+    },
+    {
+      "id": "agent-home",
+      "type": "directory",
+      "path": "${machine:account-home}/.claude",
+      "mode": "0700",
+      "owner": "${machine:account}"
+    },
+    {
+      "id": "state",
+      "type": "directory",
+      "mode": "0700",
+      "owner": "${machine:account}",
+      "place": "."
+    },
+    {
+      "id": "facts",
+      "type": "file",
+      "path": "${dir:state}/facts.json",
+      "mode": "0600",
+      "owner": "${machine:account}",
+      "content": "{\n  \"node\": \"${machine:name}\",\n  \"console\": \"http://127.0.0.1:${bound:mcp-endpoint:port}/mcp\"\n}\n"
+    },
+    {
+      "id": "settings",
+      "type": "file",
+      "path": "${dir:state}/settings.json",
+      "mode": "0600",
+      "owner": "${machine:account}",
+      "merge": "json",
+      "content": "{\n  \"role\": \"\",\n  \"mcp_servers\": {}\n}\n"
+    }
+  ],
+  "build": {
+    "artifacts": [
+      {
+        "name": "tools",
+        "kind": "bundle",
+        "language": "go",
+        "system": "arch",
+        "from": "cmd/claude-code",
+        "binary": "claude-code",
+        "loads": [
+          "claude-code"
+        ],
+        "env": {
+          "MESH_CLAUDE_CODE_STATE": "${dir:state}",
+          "MESH_CLAUDE_CODE_FACTS": "${dir:state}/facts.json",
+          "MESH_CLAUDE_CODE_SETTINGS": "${dir:state}/settings.json"
+        }
+      }
+    ]
+  }
+}

modules/claude-licence-manager/README.md

@@ -0,0 +1,55 @@
+# claude-licence-manager
+
+Holds the `anthropic-licence-manager` seat: every Anthropic licence the mesh has, kept alive by one
+rotation source, and handed to each consumer sealed (novox/hq ADR 0183, ADR 0206, design 39).
+
+## How a licence comes to exist
+
+Nothing is configured. Every node running `claude-code` reports what it holds as that module's
+`holdings` state — the account, fingerprints and expiries, never a token. This module reads every report
+when it starts and watches them:
+
+1. A report with a refresh token it does not hold is a **candidate**.
+2. It asks that node's `claude_code_grant`, giving its public key, and receives the grant sealed to it.
+3. **It refreshes it.** If the vendor exchanges the token, the grant is this module's — encrypted at rest
+   with the key the vault made for it — and from then on it is the only refresher. If not, the candidate
+   is recorded dead and nothing is adopted.
+4. Several nodes logged in to one account: newest login first; the rest are never exchanged.
+5. A node reporting that account and bound to nothing is bound to it.
+
+Each node is then handed an access token only, so the agent there never refreshes, and a refresh token
+appearing on a node later can only be a person's login — which wins if it refreshes.
+
+An API key enters through `adopt`, from a file on this module's node.
+
+## What each consumer holds
+
+This module's `bindings` state: one key per consumer (a node's name) with the licence, its kind and a
+generation that grows with every rotation and switch. `claude-code` watches its own key and, on a newer
+generation, asks `current` with its public key.
+
+## The seat's verbs
+
+`licences`, `bindings`, `bind`, `switch`, `release`, `refresh`, `usage`, `adopt`, `current` — through
+the console as `anthropic-licence-manager.<verb>`. No answer carries a token.
+
+## Settings
+
+`settings.json` in the state directory: `cadence_minutes` (240), `floor_minutes` (60),
+`failures_to_notify` (3), `cooldown_hours` (24), `refresh_warn_days` (3).
+
+## Events
+
+`licence.adopted`, `licence.refused`, `licence.failing`, `usage.read` — none carries a secret.
+
+## Code and tests
+
+Go, one binary (`cmd/claude-licence-manager`): the seat's verbs and the daemon in one launched bundle,
+`prepare` as the run-once preparation step. The sealed box is `claude-code`'s own format, byte for byte —
+the two modules carry the same `seal.go` — and a test opens one sealed by the TypeScript agent module the
+Go one replaced, so the format is the one already on the machines.
+
+    go test ./...
+    # the store against a real postgres:
+    docker run -d --rm --name licmgr-pg -e POSTGRES_PASSWORD=t -p 15498:5432 postgres:16-alpine
+    MESH_TEST_POSTGRES=postgres://postgres:t@127.0.0.1:15498/postgres go test ./...

modules/claude-licence-manager/cmd/claude-licence-manager/crypt.go

@@ -0,0 +1,64 @@
+package main
+
+// The grants at rest (novox/hq ADR 0183): encrypted with a key the vault made for this module, so the
+// store holds ciphertext and only this module, reading its own secret, can open a row. AES-256-GCM, the
+// key derived from the vault's secret by SHA-256 so a secret of any length serves.
+
+import (
+	"crypto/rand"
+	"crypto/sha256"
+	"encoding/base64"
+	"errors"
+	"os"
+	"strings"
+)
+
+// Crypt seals and opens what the store keeps.
+type Crypt struct{ key []byte }
+
+// NewCrypt is the store's cipher from the vault's secret.
+func NewCrypt(secret string) (*Crypt, error) {
+	secret = strings.TrimSpace(secret)
+	if secret == "" {
+		return nil, errors.New("the key the grants are encrypted with is empty: the vault has not delivered it yet")
+	}
+	sum := sha256.Sum256([]byte(secret))
+	return &Crypt{key: sum[:]}, nil
+}
+
+// CryptFromFile reads the vault's secret from the file the mesh delivered it to.
+func CryptFromFile(path string) (*Crypt, error) {
+	raw, err := os.ReadFile(path)
+	if err != nil {
+		return nil, err
+	}
+	return NewCrypt(string(raw))
+}
+
+// Seal encrypts a plaintext as `v1.<iv>.<ciphertext and tag>`.
+func (c *Crypt) Seal(plaintext string) string {
+	gcm, _ := newGCM(c.key)
+	iv := make([]byte, 12)
+	_, _ = rand.Read(iv)
+	b64 := base64.StdEncoding.EncodeToString
+	return "v1." + b64(iv) + "." + b64(gcm.Seal(nil, iv, []byte(plaintext), nil))
+}
+
+// Open decrypts what Seal made with the same key.
+func (c *Crypt) Open(sealed string) (string, error) {
+	parts := strings.Split(sealed, ".")
+	if len(parts) != 3 || parts[0] != "v1" {
+		return "", errors.New("not a grant this module sealed")
+	}
+	iv, err1 := base64.StdEncoding.DecodeString(parts[1])
+	ct, err2 := base64.StdEncoding.DecodeString(parts[2])
+	if err := errors.Join(err1, err2); err != nil {
+		return "", err
+	}
+	gcm, _ := newGCM(c.key)
+	plain, err := gcm.Open(nil, iv, ct, nil)
+	if err != nil {
+		return "", errors.New("the grant does not open with this module's key")
+	}
+	return string(plain), nil
+}

modules/claude-licence-manager/cmd/claude-licence-manager/main.go

@@ -0,0 +1,348 @@
+// claude-licence-manager (novox/hq ADR 0183, ADR 0206, design 39): one binary, launched by the control
+// node's runtime and speaking MCP to it over stdio through the Go SDK (ADR 0193, ADR 0198). It serves the
+// `anthropic-licence-manager` seat's verbs and, beside them, runs long: it watches what every node reports
+// holding and adopts a login it does not hold, keeps every grant alive under a lease, and reads usage.
+//
+// `claude-licence-manager prepare` is the preparation step (ADR 0135): the host runs it once before the
+// version that needs it, with the module's words and no bus, and it brings the store's schema to shape.
+//
+// stdout is the MCP channel; everything this module says, it says on stderr.
+package main
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+	"sort"
+	"strings"
+	"sync"
+	"time"
+
+	stdio "git.novox.be/novox/mesh-sdk/go"
+)
+
+// Seat is the role this module holds.
+const Seat = "anthropic-licence-manager"
+
+func say(format string, args ...any) {
+	fmt.Fprintf(os.Stderr, "[claude-licence-manager] "+format+"\n", args...)
+}
+
+func main() {
+	if len(os.Args) > 1 && os.Args[1] == "prepare" {
+		if err := prepare(); err != nil {
+			say("preparing the store failed: %v", err)
+			os.Exit(1)
+		}
+		say("the store's schema is what this version needs")
+		return
+	}
+	go daemon()
+	if err := stdio.Serve("", tools()); err != nil {
+		say("%v", err)
+		os.Exit(1)
+	}
+}
+
+func prepare() error {
+	ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
+	defer cancel()
+	store, err := PgStoreFromEnv(ctx)
+	if err != nil {
+		return err
+	}
+	defer store.Close()
+	return store.Migrate(ctx)
+}
+
+// ---- what the binary is handed -----------------------------------------------------------------------
+
+var (
+	built   *Manager
+	buildMu sync.Mutex
+)
+
+// manager builds the rules' dependencies once, from the module's words (ADR 0192): file paths, never
+// values. A failure is said and tried again on the next call, so a database that arrives late is not fatal.
+func manager() (*Manager, error) {
+	buildMu.Lock()
+	defer buildMu.Unlock()
+	if built != nil {
+		return built, nil
+	}
+	dir, keyFile := os.Getenv("MESH_LICENCE_STATE"), os.Getenv("MESH_LICENCE_KEY_FILE")
+	if dir == "" || keyFile == "" {
+		return nil, errors.New("MESH_LICENCE_STATE and MESH_LICENCE_KEY_FILE are not set: the mesh renders them for this module")
+	}
+	crypt, err := CryptFromFile(keyFile)
+	if err != nil {
+		return nil, err
+	}
+	keys, err := keypair(dir)
+	if err != nil {
+		return nil, err
+	}
+	store, err := PgStoreFromEnv(context.Background())
+	if err != nil {
+		return nil, err
+	}
+	node, _ := os.Hostname()
+	if n := os.Getenv("MESH_NODE"); n != "" {
+		node = n
+	}
+	bindings := stdio.State("bindings")
+	built = &Manager{
+		Store:  store,
+		Vendor: LiveVendor(),
+		Crypt:  crypt,
+		Keys:   keys,
+		AskGrant: func(_ context.Context, node, publicKey string) (GrantAnswer, error) {
+			var a GrantAnswer
+			raw, err := stdio.Ask("claude-code.claude_code_grant@"+node, map[string]any{"public_key": publicKey})
+			if err != nil {
+				return a, err
+			}
+			return a, json.Unmarshal(raw, &a)
+		},
+		PutBinding: func(_ context.Context, consumer string, b BindingState) error {
+			_, err := bindings.Put(consumer, b)
+			return err
+		},
+		DeleteBinding: func(_ context.Context, consumer string) error { return bindings.Delete(consumer) },
+		Emit:          func(event string, body map[string]any) error { return stdio.Emit(event, body) },
+		Now:           time.Now,
+		Log:           say,
+		Holder:        fmt.Sprintf("%s:%d", node, os.Getpid()),
+		Settings:      SettingsFrom(os.Getenv("MESH_LICENCE_SETTINGS")),
+	}
+	return built, nil
+}
+
+// keypair is this module's own, made once in its state directory; the private half never leaves it.
+// Written whole, then linked into place, so a second process reads the first's key and never half of it.
+func keypair(dir string) (KeyPair, error) {
+	file := filepath.Join(dir, "manager-key.json")
+	if _, err := os.Stat(file); errors.Is(err, os.ErrNotExist) {
+		k, err := GenerateKeyPair()
+		if err != nil {
+			return KeyPair{}, err
+		}
+		raw, _ := json.Marshal(k)
+		tmp := filepath.Join(dir, fmt.Sprintf(".manager-key.%d.json", os.Getpid()))
+		if err := os.WriteFile(tmp, raw, 0o600); err != nil {
+			return KeyPair{}, err
+		}
+		_ = os.Link(tmp, file) // fails when another made it first, which is right
+		_ = os.Remove(tmp)
+	}
+	raw, err := os.ReadFile(file)
+	if err != nil {
+		return KeyPair{}, err
+	}
+	var k KeyPair
+	return k, json.Unmarshal(raw, &k)
+}
+
+// ---- the long-running half ---------------------------------------------------------------------------
+
+func daemon() {
+	var mu sync.Mutex
+	reports := map[string]Holdings{}
+	var passing sync.Mutex
+	pass := func() {
+		passing.Lock() // one pass at a time: each account is leased, and a pass is cheap
+		defer passing.Unlock()
+		m, err := manager()
+		if err != nil {
+			say("not ready: %v", err)
+			return
+		}
+		mu.Lock()
+		all := make([]Holdings, 0, len(reports))
+		for _, r := range reports {
+			all = append(all, r)
+		}
+		mu.Unlock()
+		sort.Slice(all, func(i, j int) bool { return all[i].Node < all[j].Node })
+		adopted, err := m.Consider(context.Background(), all)
+		if err != nil {
+			say("considering the reports failed: %v", err)
+		}
+		if len(adopted) > 0 {
+			say("adopted %s", strings.Join(adopted, ", "))
+		}
+	}
+
+	// What every node holds (ADR 0206): the whole current set, then each change. Asked again until it
+	// answers — the channel to the runtime opens as the bundle starts, and the agent module's state may
+	// arrive after this one.
+	go func() {
+		waits := []time.Duration{2 * time.Second, 5 * time.Second, 10 * time.Second, 30 * time.Second}
+		for attempt := 0; ; attempt++ {
+			err := stdio.State("claude-code.holdings").Watch("", func(c stdio.StateChange) error {
+				mu.Lock()
+				if c.Op == "put" {
+					var h Holdings
+					if json.Unmarshal(c.Value, &h) == nil {
+						reports[c.Key] = h
+					}
+				} else {
+					delete(reports, c.Key)
+				}
+				mu.Unlock()
+				// During the current values the pass waits for the whole set: newest login first needs all.
+				if !c.Current {
+					go pass()
+				}
+				return nil
+			})
+			if err == nil {
+				mu.Lock()
+				n := len(reports)
+				mu.Unlock()
+				say("watching what %d node(s) hold", n)
+				pass()
+				return
+			}
+			pause := time.Minute
+			if attempt < len(waits) {
+				pause = waits[attempt]
+			}
+			say("what the nodes hold cannot be watched yet (%v); asking again in %s", err, pause)
+			time.Sleep(pause)
+		}
+	}()
+
+	refresh := time.NewTicker(time.Minute)
+	usage := time.NewTicker(5 * time.Minute)
+	for {
+		select {
+		case <-refresh.C:
+			if m, err := manager(); err == nil {
+				out, err := m.RotateDue(context.Background())
+				for _, r := range out {
+					b, _ := json.Marshal(r)
+					say("%s", b)
+				}
+				if err != nil {
+					say("refreshing failed: %v", err)
+				}
+			}
+			pass() // a login whose node did not answer last time is asked again
+		case <-usage.C:
+			if m, err := manager(); err == nil {
+				if err := m.ReadUsage(context.Background()); err != nil {
+					say("reading usage failed: %v", err)
+				}
+			}
+		}
+	}
+}
+
+// ---- the seat's verbs --------------------------------------------------------------------------------
+
+func text(a map[string]any, k string) (string, error) {
+	v, _ := a[k].(string)
+	if strings.TrimSpace(v) == "" {
+		return "", fmt.Errorf("%s is required", k)
+	}
+	return strings.TrimSpace(v), nil
+}
+
+// verb is one of the seat's verbs: listed as `<seat>.<verb>`, so the runtime serves it on the seat's subject.
+func verb(name, description string, input map[string]any, run func(ctx context.Context, m *Manager, a map[string]any) (any, error)) stdio.Tool {
+	return stdio.Tool{Name: Seat + "." + name, Description: description, Input: input,
+		Run: func(a map[string]any) (any, error) {
+			m, err := manager()
+			if err != nil {
+				return nil, err
+			}
+			return run(context.Background(), m, a)
+		}}
+}
+
+func str(description string) map[string]any {
+	return map[string]any{"type": "string", "description": description}
+}
+
+func two(a map[string]any, k1, k2 string) (string, string, error) {
+	v1, err1 := text(a, k1)
+	v2, err2 := text(a, k2)
+	return v1, v2, errors.Join(err1, err2)
+}
+
+func tools() []stdio.Tool {
+	consumer := str("the node's name")
+	return []stdio.Tool{
+		verb("licences", "Every licence the manager holds — account, kind, when its token and its refresh token expire, failures in a row, which consumers are bound to it. Never a token.",
+			nil, func(ctx context.Context, m *Manager, _ map[string]any) (any, error) { return m.Licences(ctx) }),
+		verb("bindings", "Which licence each consumer (a node's agent, by the node's name) is bound to, and the generation it was last given.",
+			nil, func(ctx context.Context, m *Manager, _ map[string]any) (any, error) { return m.Store.Bindings(ctx) }),
+		verb("bind", "Bind a consumer — a node's agent, by the node's name — to a licence. Its node fetches the licence's token at once.",
+			map[string]any{"consumer": consumer, "licence": str("a licence, as `licences` names it")},
+			func(ctx context.Context, m *Manager, a map[string]any) (any, error) {
+				c, l, err := two(a, "consumer", "licence")
+				if err != nil {
+					return nil, err
+				}
+				return m.Bind(ctx, c, l, "bind")
+			}),
+		verb("switch", "Move a consumer to another licence. Its node fetches the new licence's token at once and points the agent's account at it.",
+			map[string]any{"consumer": consumer, "licence": str("the licence to move to")},
+			func(ctx context.Context, m *Manager, a map[string]any) (any, error) {
+				c, l, err := two(a, "consumer", "licence")
+				if err != nil {
+					return nil, err
+				}
+				return m.Bind(ctx, c, l, "switch")
+			}),
+		verb("release", "Unbind a consumer. Its node keeps its last token, which expires within hours.",
+			map[string]any{"consumer": consumer},
+			func(ctx context.Context, m *Manager, a map[string]any) (any, error) {
+				c, err := text(a, "consumer")
+				if err != nil {
+					return nil, err
+				}
+				return m.Release(ctx, c, "release")
+			}),
+		verb("refresh", "Refresh a licence now, or every due licence when none is named; under each licence's lease, so it never races the daemon. Answers the outcome, never a token.",
+			map[string]any{"licence": str("a licence; absent for every due one")},
+			func(ctx context.Context, m *Manager, a map[string]any) (any, error) {
+				if l, _ := a["licence"].(string); l != "" {
+					return m.Rotate(ctx, l, true)
+				}
+				return m.RotateDue(ctx)
+			}),
+		verb("usage", "Usage readings, the latest first, for every licence or one.",
+			map[string]any{"licence": str("a licence; absent for all"), "limit": map[string]any{"type": "number", "description": "how many readings (default 20)"}},
+			func(ctx context.Context, m *Manager, a map[string]any) (any, error) {
+				l, _ := a["licence"].(string)
+				limit := 20
+				if v, ok := a["limit"].(float64); ok && v > 0 {
+					limit = int(v)
+				}
+				return m.Store.Usage(ctx, l, limit)
+			}),
+		verb("adopt", "Adopt an API key from a file on the manager's node, never as an argument. Subscriptions are adopted from the nodes' logins by themselves.",
+			map[string]any{"name": str("the licence's name"), "file": str("a file on the manager's node holding the key")},
+			func(ctx context.Context, m *Manager, a map[string]any) (any, error) {
+				n, f, err := two(a, "name", "file")
+				if err != nil {
+					return nil, err
+				}
+				return m.AdoptKey(ctx, n, f)
+			}),
+		verb("current", "For a consumer's agent module (ADR 0206): its token, sealed to the public key it sends, with the licence, kind and generation. Null when it is bound to nothing.",
+			map[string]any{"consumer": consumer, "public_key": str("the consumer's public key, PEM")},
+			func(ctx context.Context, m *Manager, a map[string]any) (any, error) {
+				c, k, err := two(a, "consumer", "public_key")
+				if err != nil {
+					return nil, err
+				}
+				return m.Current(ctx, c, k)
+			}),
+	}
+}

modules/claude-licence-manager/cmd/claude-licence-manager/manager.go

@@ -0,0 +1,678 @@
+package main
+
+// The Anthropic licence manager's rules (novox/hq ADR 0183, ADR 0206, design 39), written against what it
+// is handed — a store, the vendor, a way to ask a node, its own state, a way to emit — so every rule is
+// tested without a bus, a database or the vendor.
+//
+//   - A licence is an account, learned from what the nodes report (`holdings`, the agent module's state).
+//     A report with a refresh token the manager does not hold is a candidate.
+//   - The secret is asked for, sealed to this module's key, never published.
+//   - Adopting is refreshing: newest login first, once per account; a failure adopts nothing.
+//   - What each consumer should hold is this module's `bindings` state, with a generation that grows with
+//     every rotation and switch; the consumer fetches its token by asking `current`.
+//   - One rotation source: every exchange with the vendor runs under a lease.
+
+import (
+	"context"
+	"crypto/sha256"
+	"encoding/hex"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"os"
+	"regexp"
+	"sort"
+	"strings"
+	"time"
+)
+
+// Fingerprint names a token without being one: the agent module's own fingerprint, so the two compare.
+func Fingerprint(s string) string {
+	sum := sha256.Sum256([]byte(s))
+	return "sha256:" + hex.EncodeToString(sum[:])[:16]
+}
+
+// Identity is the account a grant belongs to, as the agent's own state file names it.
+type Identity struct {
+	AccountUUID      string `json:"accountUuid"`
+	EmailAddress     string `json:"emailAddress,omitempty"`
+	OrganizationUUID string `json:"organizationUuid,omitempty"`
+}
+
+// Holdings is one node's report, as the agent module writes it to its `holdings` state (ADR 0206).
+type Holdings struct {
+	Node     string    `json:"node"`
+	Identity *Identity `json:"identity"`
+	Kind     string    `json:"kind"`
+	Refresh  struct {
+		Present     bool   `json:"present"`
+		Fingerprint string `json:"fingerprint"`
+	} `json:"refresh"`
+	ChangedAt string `json:"changedAt"`
+}
+
+// BindingState is what `bindings` holds for one consumer: no secret, only what it should hold and which
+// generation.
+type BindingState struct {
+	Licence    string `json:"licence"`
+	Kind       string `json:"kind"`
+	Generation int64  `json:"generation"`
+}
+
+// Settings are the manager's own, declared with defaults (design 39 §8).
+type Settings struct {
+	Cadence          time.Duration // rotate a grant once older than this
+	Floor            time.Duration // refresh in any case with less than this left
+	FailuresToNotify int
+	Cooldown         time.Duration // at most one notification per licence in this window
+	RefreshWarn      time.Duration // warn this long before a refresh token itself expires
+}
+
+// Defaults are the settings a fresh mesh runs with.
+var Defaults = Settings{Cadence: 4 * time.Hour, Floor: time.Hour, FailuresToNotify: 3, Cooldown: 24 * time.Hour, RefreshWarn: 72 * time.Hour}
+
+// SettingsFrom reads the settings file, keeping a default for anything absent or not positive.
+func SettingsFrom(path string) Settings {
+	s := Defaults
+	raw, err := os.ReadFile(path)
+	if err != nil {
+		return s
+	}
+	var f map[string]float64
+	if json.Unmarshal(raw, &f) != nil {
+		return s
+	}
+	set := func(k string, unit time.Duration, into *time.Duration) {
+		if v := f[k]; v > 0 {
+			*into = time.Duration(v * float64(unit))
+		}
+	}
+	set("cadence_minutes", time.Minute, &s.Cadence)
+	set("floor_minutes", time.Minute, &s.Floor)
+	set("cooldown_hours", time.Hour, &s.Cooldown)
+	if v := f["refresh_warn_days"]; v > 0 {
+		s.RefreshWarn = time.Duration(v * float64(24*time.Hour))
+	}
+	if v := f["failures_to_notify"]; v > 0 {
+		s.FailuresToNotify = int(v)
+	}
+	return s
+}
+
+// GrantAnswer is what a node's `claude_code_grant` answers: a login sealed to the key given, or nothing.
+type GrantAnswer struct {
+	Sealed      *SealedBox `json:"sealed"`
+	Identity    *Identity  `json:"identity"`
+	Fingerprint string     `json:"fingerprint"`
+}
+
+// Manager is the rules and what they are handed.
+type Manager struct {
+	Store  Store
+	Vendor Vendor
+	Crypt  *Crypt
+	Keys   KeyPair
+	// AskGrant asks a node's agent module for the grant a login left there, sealed to publicKey. An error
+	// is the node not answering; a nil Sealed is no login waiting.
+	AskGrant func(ctx context.Context, node, publicKey string) (GrantAnswer, error)
+	// PutBinding and DeleteBinding are this module's `bindings` state.
+	PutBinding    func(ctx context.Context, consumer string, b BindingState) error
+	DeleteBinding func(ctx context.Context, consumer string) error
+	Emit          func(event string, body map[string]any) error
+	Now           func() time.Time
+	Log           func(format string, args ...any)
+	// Holder names this process in a lease, so a second run is told apart.
+	Holder   string
+	Settings Settings
+}
+
+const leaseFor = 2 * time.Minute
+
+// NameFor is a licence's name: the account's address where it has one, else its id.
+func NameFor(id Identity) string {
+	if e := strings.TrimSpace(id.EmailAddress); e != "" {
+		return e
+	}
+	return id.AccountUUID
+}
+
+// ---- learning licences from what the nodes hold ------------------------------------------------------
+
+// Candidate is a report the manager should try.
+type Candidate struct {
+	Node        string
+	Identity    Identity
+	Fingerprint string
+	ChangedAt   int64
+}
+
+// CandidatesIn is the candidates in a set of reports by account, newest login first (ADR 0206 §2, §4). A
+// report without an identity is not one: a grant is filed under its account or not at all.
+func (m *Manager) CandidatesIn(ctx context.Context, reports []Holdings) (map[string][]Candidate, error) {
+	out := map[string][]Candidate{}
+	for _, r := range reports {
+		if !r.Refresh.Present || r.Refresh.Fingerprint == "" || r.Identity == nil || r.Identity.AccountUUID == "" {
+			continue
+		}
+		settled, err := m.Store.Outcome(ctx, r.Refresh.Fingerprint)
+		if err != nil {
+			return nil, err
+		}
+		if settled != "" {
+			continue // adopted, dead, skipped, refused or gone: settled once
+		}
+		held, err := m.Store.LicenceForAccount(ctx, r.Identity.AccountUUID)
+		if err != nil {
+			return nil, err
+		}
+		if held != nil && held.RefreshFingerprint == r.Refresh.Fingerprint {
+			continue
+		}
+		var changed int64
+		if t, err := time.Parse(time.RFC3339Nano, r.ChangedAt); err == nil {
+			changed = t.UnixMilli()
+		}
+		// The latest login wins: one no newer than the grant held is not a newer login.
+		if held != nil && changed <= held.AdoptedAt {
+			continue
+		}
+		out[r.Identity.AccountUUID] = append(out[r.Identity.AccountUUID],
+			Candidate{Node: r.Node, Identity: *r.Identity, Fingerprint: r.Refresh.Fingerprint, ChangedAt: changed})
+	}
+	for _, list := range out {
+		sort.SliceStable(list, func(i, j int) bool { return list[i].ChangedAt > list[j].ChangedAt })
+	}
+	return out, nil
+}
+
+// Consider every report (ADR 0206): for each account with candidates, under that account's lease, try them
+// newest first; the first that refreshes is adopted and the rest are settled as skipped without being
+// exchanged. Answers what was adopted.
+func (m *Manager) Consider(ctx context.Context, reports []Holdings) ([]string, error) {
+	byAccount, err := m.CandidatesIn(ctx, reports)
+	if err != nil {
+		return nil, err
+	}
+	accounts := make([]string, 0, len(byAccount))
+	for a := range byAccount {
+		accounts = append(accounts, a)
+	}
+	sort.Strings(accounts)
+	// A node reporting an account the manager already holds, and bound to nothing, is bound to it
+	// (ADR 0206 §7) — whenever its report arrives, not only when the licence is adopted: a node whose own
+	// login is older than the one adopted is never a candidate, and would otherwise never be bound.
+	if err := m.bindReporters(ctx, reports); err != nil {
+		return nil, err
+	}
+	var adopted []string
+	for _, account := range accounts {
+		list := byAccount[account]
+		key := "account:" + account
+		ok, err := m.Store.Lease(ctx, key, m.Holder, leaseFor)
+		if err != nil || !ok {
+			continue
+		}
+		for i, c := range list {
+			name, err := m.adoptOne(ctx, c, reports)
+			if err != nil {
+				m.Log("adopting %s's login failed: %v", c.Node, err)
+				continue
+			}
+			if name != "" {
+				adopted = append(adopted, name)
+				for _, rest := range list[i+1:] {
+					_ = m.Store.RecordOutcome(ctx, rest.Fingerprint, rest.Node, account, Skipped, c.Node+"'s newer login was adopted first")
+				}
+				break
+			}
+		}
+		_ = m.Store.Unlease(ctx, key, m.Holder)
+	}
+	return adopted, nil
+}
+
+// bindReporters binds each reporting node that is bound to nothing to the licence its account already has.
+func (m *Manager) bindReporters(ctx context.Context, reports []Holdings) error {
+	for _, rep := range reports {
+		if rep.Identity == nil || rep.Identity.AccountUUID == "" {
+			continue
+		}
+		if b, err := m.Store.Binding(ctx, rep.Node); err != nil || b != nil {
+			if err != nil {
+				return err
+			}
+			continue
+		}
+		l, err := m.Store.LicenceForAccount(ctx, rep.Identity.AccountUUID)
+		if err != nil {
+			return err
+		}
+		if l == nil {
+			continue
+		}
+		b, err := m.Store.Bind(ctx, rep.Node, l.Name)
+		if err != nil {
+			return err
+		}
+		_ = m.Store.Audit(ctx, "bound", map[string]any{"consumer": rep.Node, "licence": l.Name, "by": "its account's report"})
+		if err := m.PutBinding(ctx, rep.Node, BindingState{Licence: l.Name, Kind: l.Kind, Generation: b.Generation}); err != nil {
+			return err
+		}
+		m.Log("bound %s to %s, the licence its account already has", rep.Node, l.Name)
+	}
+	return nil
+}
+
+func (m *Manager) adoptOne(ctx context.Context, c Candidate, reports []Holdings) (string, error) {
+	answer, err := m.AskGrant(ctx, c.Node, m.Keys.PublicKey)
+	if err != nil {
+		// Not answering is not an answer: asked again on the next pass.
+		m.Log("%s did not hand over its login: %v", c.Node, err)
+		return "", nil
+	}
+	if answer.Sealed == nil {
+		return "", m.Store.RecordOutcome(ctx, c.Fingerprint, c.Node, c.Identity.AccountUUID, Gone, "no login was waiting when asked")
+	}
+	plain, err := Open(*answer.Sealed, m.Keys.PrivateKey)
+	if err != nil {
+		return "", m.Store.RecordOutcome(ctx, c.Fingerprint, c.Node, c.Identity.AccountUUID, Refused, "the grant did not open with this module's key")
+	}
+	var offered FullGrant
+	if err := json.Unmarshal([]byte(plain), &offered); err != nil || offered.RefreshToken == "" {
+		return "", m.Store.RecordOutcome(ctx, c.Fingerprint, c.Node, c.Identity.AccountUUID, Refused, "the grant holds no refresh token")
+	}
+	if Fingerprint(offered.RefreshToken) != c.Fingerprint {
+		m.Log("%s's login changed while it was asked for; waiting for its next report", c.Node)
+		return "", nil
+	}
+
+	// Adopting is refreshing (ADR 0206 §4): the exchange is the check, and from here this module is the
+	// only holder of a live refresh token for the account.
+	r := m.Vendor.Refresh(ctx, offered)
+	if !r.OK {
+		_ = m.Store.RecordOutcome(ctx, c.Fingerprint, c.Node, c.Identity.AccountUUID, Dead, fmt.Sprintf("%d %s", r.Status, r.Reason))
+		_ = m.Store.Audit(ctx, "refused", map[string]any{"node": c.Node, "account": c.Identity.AccountUUID, "status": r.Status, "reason": r.Reason})
+		_ = m.Emit("licence.refused", map[string]any{"node": c.Node, "account": NameFor(c.Identity),
+			"reason": fmt.Sprintf("the login's refresh token did not refresh (%d)", r.Status)})
+		m.Log("%s's login for %s did not refresh: %d %s", c.Node, NameFor(c.Identity), r.Status, r.Reason)
+		return "", nil
+	}
+	// The identity guard, on two sources (ADR 0206 §8).
+	if r.Account != "" && r.Account != c.Identity.AccountUUID {
+		_ = m.Store.RecordOutcome(ctx, c.Fingerprint, c.Node, c.Identity.AccountUUID, Refused,
+			"the node says "+c.Identity.AccountUUID+", the vendor says "+r.Account)
+		_ = m.Store.Audit(ctx, "refused", map[string]any{"node": c.Node, "reported": c.Identity.AccountUUID, "vendor": r.Account})
+		_ = m.Emit("licence.refused", map[string]any{"node": c.Node, "account": NameFor(c.Identity),
+			"reason": "the account the node reported is not the one the vendor answered for"})
+		return "", nil
+	}
+
+	held, err := m.Store.LicenceForAccount(ctx, c.Identity.AccountUUID)
+	if err != nil {
+		return "", err
+	}
+	now := m.Now().UnixMilli()
+	l := Licence{Name: NameFor(c.Identity), Kind: "subscription", AccountUUID: c.Identity.AccountUUID,
+		Email: c.Identity.EmailAddress, OrganizationUUID: c.Identity.OrganizationUUID}
+	if held != nil {
+		l.Name, l.NotifiedAt = held.Name, held.NotifiedAt
+		if l.Email == "" {
+			l.Email = held.Email
+		}
+		if l.OrganizationUUID == "" {
+			l.OrganizationUUID = held.OrganizationUUID
+		}
+	}
+	m.keep(&l, r.Grant)
+	l.AdoptedAt = max(now, c.ChangedAt)
+	if err := m.Store.SaveLicence(ctx, l); err != nil {
+		return "", err
+	}
+	why := "a new licence"
+	if held != nil {
+		why = "a newer login"
+	}
+	_ = m.Store.RecordOutcome(ctx, c.Fingerprint, c.Node, c.Identity.AccountUUID, Adopted, why)
+	_ = m.Store.Audit(ctx, "adopted", map[string]any{"licence": l.Name, "node": c.Node, "account": c.Identity.AccountUUID,
+		"vendorNamedAccount": r.Account != ""})
+
+	// A first binding follows the login (ADR 0206 §7): every node reporting this account and bound to nothing.
+	for _, rep := range reports {
+		if rep.Identity == nil || rep.Identity.AccountUUID != c.Identity.AccountUUID {
+			continue
+		}
+		if b, err := m.Store.Binding(ctx, rep.Node); err != nil || b != nil {
+			continue
+		}
+		if _, err := m.Store.Bind(ctx, rep.Node, l.Name); err == nil {
+			_ = m.Store.Audit(ctx, "bound", map[string]any{"consumer": rep.Node, "licence": l.Name, "by": "its login"})
+		}
+	}
+	if err := m.publishAdvance(ctx, l); err != nil {
+		return "", err
+	}
+	_ = m.Emit("licence.adopted", map[string]any{"licence": l.Name, "from": c.Node, "replaced": held != nil})
+	m.Log("adopted %s from %s (%s)", l.Name, c.Node, why)
+	return l.Name, nil
+}
+
+// keep stores a grant on its licence: encrypted, fingerprinted, its expiries, fresh.
+func (m *Manager) keep(l *Licence, g FullGrant) {
+	raw, _ := json.Marshal(g)
+	l.Sealed = m.Crypt.Seal(string(raw))
+	l.RefreshFingerprint = Fingerprint(g.RefreshToken)
+	l.AccessExpiresAt = g.ExpiresAt
+	if g.RefreshTokenExpiresAt != nil {
+		l.RefreshExpiresAt = *g.RefreshTokenExpiresAt
+	}
+	l.Failures = 0
+	l.RotatedAt = m.Now().UnixMilli()
+}
+
+// publishAdvance gives every consumer of a licence a new generation, and tells each in the state.
+func (m *Manager) publishAdvance(ctx context.Context, l Licence) error {
+	bindings, err := m.Store.Advance(ctx, l.Name)
+	if err != nil {
+		return err
+	}
+	for _, b := range bindings {
+		if err := m.PutBinding(ctx, b.Consumer, BindingState{Licence: b.Licence, Kind: l.Kind, Generation: b.Generation}); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// ---- keeping grants alive ----------------------------------------------------------------------------
+
+// Due says whether a licence needs a refresh now: near expiry, or older than the cadence.
+func Due(l Licence, now time.Time, s Settings) bool {
+	if l.Kind != "subscription" || l.Sealed == "" {
+		return false
+	}
+	ms := now.UnixMilli()
+	if l.AccessExpiresAt != 0 && l.AccessExpiresAt-ms < s.Floor.Milliseconds() {
+		return true
+	}
+	return l.RotatedAt == 0 || ms-l.RotatedAt >= s.Cadence.Milliseconds()
+}
+
+// Rotate refreshes one licence under its lease (design 39 §3). A second run started together finds the
+// lease live and does nothing; one started just after finds a fresh grant and is not due. force refreshes
+// whatever the age — the seat's `refresh` verb.
+func (m *Manager) Rotate(ctx context.Context, name string, force bool) (map[string]any, error) {
+	key := "licence:" + name
+	ok, err := m.Store.Lease(ctx, key, m.Holder, leaseFor)
+	if err != nil {
+		return nil, err
+	}
+	if !ok {
+		return map[string]any{"licence": name, "refreshed": false, "reason": "another run holds its lease"}, nil
+	}
+	defer func() { _ = m.Store.Unlease(ctx, key, m.Holder) }()
+	l, err := m.Store.Licence(ctx, name)
+	if err != nil {
+		return nil, err
+	}
+	if l == nil {
+		return map[string]any{"licence": name, "refreshed": false, "reason": "no such licence"}, nil
+	}
+	if l.Kind != "subscription" || l.Sealed == "" {
+		return map[string]any{"licence": name, "refreshed": false, "reason": "an API key does not refresh"}, nil
+	}
+	now := m.Now()
+	if !force && !Due(*l, now, m.Settings) {
+		return map[string]any{"licence": name, "refreshed": false, "reason": "not due"}, nil
+	}
+	plain, err := m.Crypt.Open(l.Sealed)
+	if err != nil {
+		return nil, err
+	}
+	var g FullGrant
+	if err := json.Unmarshal([]byte(plain), &g); err != nil {
+		return nil, err
+	}
+	r := m.Vendor.Refresh(ctx, g)
+	if !r.OK {
+		l.Failures++
+		m.Log("%s did not refresh (%d in a row): %d %s", name, l.Failures, r.Status, r.Reason)
+		_ = m.Store.Audit(ctx, "failed", map[string]any{"licence": name, "status": r.Status, "reason": r.Reason, "failures": l.Failures})
+		m.notify(l, fmt.Sprintf("refresh failed %d time(s) in a row: %d", l.Failures, r.Status), l.Failures >= m.Settings.FailuresToNotify)
+		if err := m.Store.SaveLicence(ctx, *l); err != nil {
+			return nil, err
+		}
+		return map[string]any{"licence": name, "refreshed": false, "reason": fmt.Sprintf("%d %s", r.Status, r.Reason), "failures": l.Failures}, nil
+	}
+	m.keep(l, r.Grant)
+	if l.RefreshExpiresAt != 0 {
+		left := time.Duration(l.RefreshExpiresAt-now.UnixMilli()) * time.Millisecond
+		m.notify(l, fmt.Sprintf("its refresh token expires in %.1f day(s): a person must log in again", left.Hours()/24),
+			left < m.Settings.RefreshWarn)
+	}
+	if err := m.Store.SaveLicence(ctx, *l); err != nil {
+		return nil, err
+	}
+	_ = m.Store.Audit(ctx, "rotated", map[string]any{"licence": name, "expiresAt": l.AccessExpiresAt})
+	if err := m.publishAdvance(ctx, *l); err != nil {
+		return nil, err
+	}
+	return map[string]any{"licence": name, "refreshed": true, "expiresAt": time.UnixMilli(l.AccessExpiresAt).UTC().Format(time.RFC3339)}, nil
+}
+
+// notify emits `licence.failing` at most once per cooldown (design 39 §3); it carries no secret.
+func (m *Manager) notify(l *Licence, why string, when bool) {
+	if !when {
+		return
+	}
+	now := m.Now().UnixMilli()
+	if l.NotifiedAt != 0 && now-l.NotifiedAt < m.Settings.Cooldown.Milliseconds() {
+		return
+	}
+	l.NotifiedAt = now
+	_ = m.Emit("licence.failing", map[string]any{"licence": l.Name, "why": why})
+}
+
+// RotateDue refreshes every licence that is due.
+func (m *Manager) RotateDue(ctx context.Context) ([]map[string]any, error) {
+	all, err := m.Store.Licences(ctx)
+	if err != nil {
+		return nil, err
+	}
+	var out []map[string]any
+	for _, l := range all {
+		if Due(l, m.Now(), m.Settings) {
+			r, err := m.Rotate(ctx, l.Name, false)
+			if err != nil {
+				return out, err
+			}
+			out = append(out, r)
+		}
+	}
+	return out, nil
+}
+
+// ReadUsage reads and records each subscription's usage (ADR 0054); the event names the licence and numbers.
+func (m *Manager) ReadUsage(ctx context.Context) error {
+	all, err := m.Store.Licences(ctx)
+	if err != nil {
+		return err
+	}
+	for _, l := range all {
+		if l.Kind != "subscription" || l.Sealed == "" {
+			continue
+		}
+		plain, err := m.Crypt.Open(l.Sealed)
+		if err != nil {
+			return err
+		}
+		var g FullGrant
+		_ = json.Unmarshal([]byte(plain), &g)
+		raw, err := m.Vendor.Usage(ctx, g.AccessToken)
+		if err != nil || raw == nil {
+			continue
+		}
+		reading := FlattenUsage(raw)
+		if err := m.Store.RecordUsage(ctx, l.Name, m.Now().UnixMilli(), reading, raw); err != nil {
+			return err
+		}
+		_ = m.Emit("usage.read", map[string]any{"licence": l.Name, "sessionPct": reading.SessionPct,
+			"weeklyPct": reading.WeeklyPct, "sonnetPct": reading.SonnetPct})
+	}
+	return nil
+}
+
+// ---- the seat's verbs --------------------------------------------------------------------------------
+
+// Current is a consumer's token sealed to the key it sent (ADR 0206 §6): for a subscription the access
+// token and its expiries only — never the refresh token, which no node holds. Nil when it is bound to
+// nothing.
+func (m *Manager) Current(ctx context.Context, consumer, publicKey string) (map[string]any, error) {
+	if !strings.Contains(publicKey, "PUBLIC KEY") {
+		return nil, errors.New("current seals to the consumer's public key, and none was given")
+	}
+	b, err := m.Store.Binding(ctx, consumer)
+	if err != nil || b == nil {
+		return nil, err
+	}
+	l, err := m.Store.Licence(ctx, b.Licence)
+	if err != nil || l == nil || l.Sealed == "" {
+		return nil, err
+	}
+	plain, err := m.Crypt.Open(l.Sealed)
+	if err != nil {
+		return nil, err
+	}
+	handed := plain
+	if l.Kind == "subscription" {
+		var g FullGrant
+		if err := json.Unmarshal([]byte(plain), &g); err != nil {
+			return nil, err
+		}
+		access, _ := json.Marshal(map[string]any{"accessToken": g.AccessToken, "expiresAt": g.ExpiresAt,
+			"refreshTokenExpiresAt": g.RefreshTokenExpiresAt, "scopes": g.Scopes,
+			"subscriptionType": g.SubscriptionType, "rateLimitTier": g.RateLimitTier})
+		handed = string(access)
+	}
+	box, err := Seal(handed, publicKey)
+	if err != nil {
+		return nil, err
+	}
+	out := map[string]any{"licence": l.Name, "kind": l.Kind, "generation": b.Generation, "sealed": box}
+	if l.AccountUUID != "" {
+		out["identity"] = Identity{AccountUUID: l.AccountUUID, EmailAddress: l.Email, OrganizationUUID: l.OrganizationUUID}
+	}
+	return out, nil
+}
+
+// Bind binds or switches a consumer: a person's act (ADR 0183), told to the consumer as a new generation.
+func (m *Manager) Bind(ctx context.Context, consumer, licence, by string) (map[string]any, error) {
+	l, err := m.Store.Licence(ctx, licence)
+	if err != nil {
+		return nil, err
+	}
+	if l == nil {
+		return nil, fmt.Errorf("there is no licence %s; `licences` lists them", licence)
+	}
+	before, err := m.Store.Binding(ctx, consumer)
+	if err != nil {
+		return nil, err
+	}
+	b, err := m.Store.Bind(ctx, consumer, licence)
+	if err != nil {
+		return nil, err
+	}
+	from, what := "", "bound"
+	if before != nil {
+		from, what = before.Licence, "switched"
+	}
+	_ = m.Store.Audit(ctx, what, map[string]any{"consumer": consumer, "licence": licence, "from": from, "by": by})
+	if err := m.PutBinding(ctx, consumer, BindingState{Licence: licence, Kind: l.Kind, Generation: b.Generation}); err != nil {
+		return nil, err
+	}
+	return map[string]any{"consumer": consumer, "licence": licence, "generation": b.Generation, "from": from}, nil
+}
+
+// Release unbinds a consumer; its node keeps its last token, which expires within hours.
+func (m *Manager) Release(ctx context.Context, consumer, by string) (map[string]any, error) {
+	was, err := m.Store.Binding(ctx, consumer)
+	if err != nil {
+		return nil, err
+	}
+	if ok, err := m.Store.Unbind(ctx, consumer); err != nil || !ok {
+		return map[string]any{"consumer": consumer, "released": false, "reason": "it was bound to nothing"}, err
+	}
+	if err := m.DeleteBinding(ctx, consumer); err != nil {
+		return nil, err
+	}
+	_ = m.Store.Audit(ctx, "released", map[string]any{"consumer": consumer, "licence": was.Licence, "by": by})
+	return map[string]any{"consumer": consumer, "released": true, "was": was.Licence}, nil
+}
+
+var licenceName = regexp.MustCompile(`^[A-Za-z0-9@._-]+$`)
+
+// AdoptKey adopts an API key from a file on this node — never an argument (design 39 §6).
+func (m *Manager) AdoptKey(ctx context.Context, name, file string) (map[string]any, error) {
+	if !licenceName.MatchString(name) {
+		return nil, fmt.Errorf("%q is not a licence name: letters, digits and @._-", name)
+	}
+	raw, err := os.ReadFile(file)
+	if err != nil {
+		return nil, err
+	}
+	key := strings.TrimSpace(string(raw))
+	if key == "" {
+		return nil, fmt.Errorf("%s is empty", file)
+	}
+	held, err := m.Store.Licence(ctx, name)
+	if err != nil {
+		return nil, err
+	}
+	if held != nil && held.Kind != "api-key" {
+		return nil, fmt.Errorf("%s is a subscription; an API key needs a name of its own", name)
+	}
+	l := Licence{Name: name, Kind: "api-key", Sealed: m.Crypt.Seal(key), AdoptedAt: m.Now().UnixMilli()}
+	if err := m.Store.SaveLicence(ctx, l); err != nil {
+		return nil, err
+	}
+	_ = m.Store.Audit(ctx, "adopted", map[string]any{"licence": name, "kind": "api-key", "from": "a file"})
+	if err := m.publishAdvance(ctx, l); err != nil {
+		return nil, err
+	}
+	_ = m.Emit("licence.adopted", map[string]any{"licence": name, "from": "a file", "replaced": held != nil})
+	return map[string]any{"licence": name, "kind": "api-key", "adopted": true, "fingerprint": Fingerprint(key)}, nil
+}
+
+// Licences is each licence as a person reads it: health and who is bound, never a token.
+func (m *Manager) Licences(ctx context.Context) ([]map[string]any, error) {
+	all, err := m.Store.Licences(ctx)
+	if err != nil {
+		return nil, err
+	}
+	bindings, err := m.Store.Bindings(ctx)
+	if err != nil {
+		return nil, err
+	}
+	stamp := func(ms int64) any {
+		if ms == 0 {
+			return nil
+		}
+		return time.UnixMilli(ms).UTC().Format(time.RFC3339)
+	}
+	out := []map[string]any{}
+	for _, l := range all {
+		bound := []string{}
+		for _, b := range bindings {
+			if b.Licence == l.Name {
+				bound = append(bound, b.Consumer)
+			}
+		}
+		account := l.Email
+		if account == "" {
+			account = l.AccountUUID
+		}
+		out = append(out, map[string]any{"name": l.Name, "kind": l.Kind, "account": account,
+			"accessExpiresAt": stamp(l.AccessExpiresAt), "refreshExpiresAt": stamp(l.RefreshExpiresAt),
+			"rotatedAt": stamp(l.RotatedAt), "failures": l.Failures, "bound": bound})
+	}
+	return out, nil
+}

modules/claude-licence-manager/cmd/claude-licence-manager/manager_test.go

@@ -0,0 +1,359 @@
+package main
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+	"testing"
+	"time"
+)
+
+var t0 = time.Date(2026, 10, 4, 12, 0, 0, 0, time.UTC)
+
+// stubVendor rotates like the real one is presumed to: each refresh token exchanges once.
+type stubVendor struct {
+	mu        sync.Mutex
+	live      map[string]bool
+	exchanged []string
+	issued    int
+	account   string
+	now       func() time.Time
+}
+
+func (v *stubVendor) Refresh(_ context.Context, g FullGrant) Refreshed {
+	v.mu.Lock()
+	defer v.mu.Unlock()
+	v.exchanged = append(v.exchanged, g.RefreshToken)
+	if !v.live[g.RefreshToken] {
+		return Refreshed{Status: 400, Reason: `{"error":"invalid_grant"}`}
+	}
+	delete(v.live, g.RefreshToken)
+	v.issued++
+	next := fmt.Sprintf("rt-%d", v.issued)
+	v.live[next] = true
+	g.AccessToken = fmt.Sprintf("at-%d", v.issued)
+	g.RefreshToken = next
+	g.ExpiresAt = v.now().Add(8 * time.Hour).UnixMilli()
+	exp := v.now().Add(30 * 24 * time.Hour).UnixMilli()
+	g.RefreshTokenExpiresAt = &exp
+	return Refreshed{OK: true, Grant: g, Account: v.account}
+}
+
+func (v *stubVendor) Usage(context.Context, string) (map[string]any, error) {
+	return map[string]any{"five_hour": map[string]any{"utilization": 12.0}}, nil
+}
+
+type miniMesh struct {
+	m       *Manager
+	store   *MemoryStore
+	vendor  *stubVendor
+	logins  map[string]FullGrant // node → what its credentials file holds
+	state   map[string]BindingState
+	events  []string
+	now     time.Time
+	keys    KeyPair
+	askDown bool
+}
+
+func newMesh(t *testing.T) *miniMesh {
+	t.Helper()
+	mm := &miniMesh{logins: map[string]FullGrant{}, state: map[string]BindingState{}, now: t0}
+	now := func() time.Time { return mm.now }
+	mm.store = NewMemoryStore(now)
+	mm.vendor = &stubVendor{live: map[string]bool{}, now: now}
+	crypt, _ := NewCrypt("a key the vault made")
+	mm.keys, _ = GenerateKeyPair()
+	mm.m = &Manager{
+		Store: mm.store, Vendor: mm.vendor, Crypt: crypt, Keys: mm.keys,
+		AskGrant: func(_ context.Context, node, publicKey string) (GrantAnswer, error) {
+			if mm.askDown {
+				return GrantAnswer{}, fmt.Errorf("503 no responders")
+			}
+			g, ok := mm.logins[node]
+			if !ok {
+				return GrantAnswer{}, nil
+			}
+			raw, _ := json.Marshal(g)
+			box, err := Seal(string(raw), publicKey)
+			return GrantAnswer{Sealed: &box, Fingerprint: Fingerprint(g.RefreshToken)}, err
+		},
+		PutBinding:    func(_ context.Context, c string, b BindingState) error { mm.state[c] = b; return nil },
+		DeleteBinding: func(_ context.Context, c string) error { delete(mm.state, c); return nil },
+		Emit: func(event string, body map[string]any) error {
+			raw, _ := json.Marshal(body)
+			mm.events = append(mm.events, event+" "+string(raw))
+			return nil
+		},
+		Now: now, Log: func(string, ...any) {}, Holder: "test", Settings: Defaults,
+	}
+	return mm
+}
+
+func (mm *miniMesh) report(node, rt string, at time.Time, account string) Holdings {
+	h := Holdings{Node: node, Identity: &Identity{AccountUUID: account, EmailAddress: account + "@example.org"},
+		Kind: "subscription", ChangedAt: at.Format(time.RFC3339Nano)}
+	if rt != "" {
+		h.Refresh.Present, h.Refresh.Fingerprint = true, Fingerprint(rt)
+	}
+	return h
+}
+
+func (mm *miniMesh) login(node, rt string, valid bool, at time.Time) Holdings {
+	mm.logins[node] = FullGrant{AccessToken: "local-" + node, RefreshToken: rt, ExpiresAt: mm.now.Add(time.Hour).UnixMilli()}
+	if valid {
+		mm.vendor.live[rt] = true
+	}
+	return mm.report(node, rt, at, "acct-1")
+}
+
+const licence1 = "acct-1@example.org"
+
+func TestAManagerWithNoLicenceAdoptsTheNewestLoginThatRefreshesAndNeverExchangesTheRest(t *testing.T) {
+	mm := newMesh(t)
+	ctx := context.Background()
+	older := mm.login("server", "rt-server", true, t0.Add(-time.Hour))
+	newest := mm.login("laptop", "rt-laptop", true, t0.Add(-time.Minute))
+	adopted, err := mm.m.Consider(ctx, []Holdings{older, newest})
+	if err != nil || len(adopted) != 1 || adopted[0] != licence1 {
+		t.Fatalf("adopted %v, %v", adopted, err)
+	}
+	if strings.Join(mm.vendor.exchanged, ",") != "rt-laptop" {
+		t.Fatalf("exchanged %v: an older login was exchanged although a newer one refreshed", mm.vendor.exchanged)
+	}
+	if o, _ := mm.store.Outcome(ctx, Fingerprint("rt-server")); o != Skipped {
+		t.Fatalf("the older login is %q, not skipped", o)
+	}
+	// A first binding follows the login: both nodes reported this account and were bound to nothing.
+	bs, _ := mm.store.Bindings(ctx)
+	if len(bs) != 2 || mm.state["laptop"].Licence != licence1 || mm.state["server"].Licence != licence1 {
+		t.Fatalf("bindings %v, state %v", bs, mm.state)
+	}
+	if !strings.HasPrefix(strings.Join(mm.events, "|"), "licence.adopted") {
+		t.Fatalf("events %v", mm.events)
+	}
+}
+
+func TestALoginThatDoesNotRefreshAdoptsNothingAndIsNotTriedAgain(t *testing.T) {
+	mm := newMesh(t)
+	ctx := context.Background()
+	dead := mm.login("laptop", "rt-dead", false, t0)
+	if adopted, _ := mm.m.Consider(ctx, []Holdings{dead}); len(adopted) != 0 {
+		t.Fatalf("adopted %v", adopted)
+	}
+	if o, _ := mm.store.Outcome(ctx, Fingerprint("rt-dead")); o != Dead {
+		t.Fatalf("outcome %q", o)
+	}
+	if ls, _ := mm.store.Licences(ctx); len(ls) != 0 {
+		t.Fatalf("licences %v", ls)
+	}
+	if !strings.Contains(strings.Join(mm.events, "|"), "licence.refused") {
+		t.Fatalf("events %v", mm.events)
+	}
+	_, _ = mm.m.Consider(ctx, []Holdings{dead})
+	if len(mm.vendor.exchanged) != 1 {
+		t.Fatalf("a dead refresh token was exchanged %d times", len(mm.vendor.exchanged))
+	}
+}
+
+func TestANewerLoginReplacesTheGrantHeldAndAnOlderOneDoesNot(t *testing.T) {
+	mm := newMesh(t)
+	ctx := context.Background()
+	_, _ = mm.m.Consider(ctx, []Holdings{mm.login("laptop", "rt-a", true, t0.Add(-time.Minute))})
+	before, _ := mm.store.Licence(ctx, licence1)
+	_, _ = mm.m.Consider(ctx, []Holdings{mm.login("server", "rt-old", true, t0.Add(-24*time.Hour))})
+	if strings.Join(mm.vendor.exchanged, ",") != "rt-a" {
+		t.Fatalf("an older login was exchanged: %v", mm.vendor.exchanged)
+	}
+	mm.now = t0.Add(10 * time.Minute)
+	_, _ = mm.m.Consider(ctx, []Holdings{mm.login("desktop", "rt-new", true, t0.Add(10*time.Minute))})
+	after, _ := mm.store.Licence(ctx, licence1)
+	if after.RefreshFingerprint == before.RefreshFingerprint || mm.vendor.exchanged[len(mm.vendor.exchanged)-1] != "rt-new" {
+		t.Fatalf("a newer login did not win: %v", mm.vendor.exchanged)
+	}
+	if ls, _ := mm.store.Licences(ctx); len(ls) != 1 {
+		t.Fatalf("one account became %d licences", len(ls))
+	}
+}
+
+func TestAReportNamingAnotherAccountThanTheVendorAnsweredForIsRefused(t *testing.T) {
+	mm := newMesh(t)
+	ctx := context.Background()
+	mm.vendor.account = "someone-else"
+	if adopted, _ := mm.m.Consider(ctx, []Holdings{mm.login("laptop", "rt-a", true, t0)}); len(adopted) != 0 {
+		t.Fatalf("adopted %v", adopted)
+	}
+	if o, _ := mm.store.Outcome(ctx, Fingerprint("rt-a")); o != Refused {
+		t.Fatalf("outcome %q", o)
+	}
+}
+
+func TestTwoRefreshRunsStartedTogetherRotateAGrantOnce(t *testing.T) {
+	mm := newMesh(t)
+	ctx := context.Background()
+	_, _ = mm.m.Consider(ctx, []Holdings{mm.login("laptop", "rt-a", true, t0)})
+	mm.now = t0.Add(5 * time.Hour)
+	second := *mm.m
+	second.Holder = "another run"
+	var wg sync.WaitGroup
+	results := make([]map[string]any, 2)
+	for i, m := range []*Manager{mm.m, &second} {
+		wg.Add(1)
+		go func() { defer wg.Done(); results[i], _ = m.Rotate(ctx, licence1, false) }()
+	}
+	wg.Wait()
+	n := 0
+	for _, r := range results {
+		if r["refreshed"] == true {
+			n++
+		}
+	}
+	if n != 1 {
+		t.Fatalf("rotated %d times: %v", n, results)
+	}
+	if r, _ := second.Rotate(ctx, licence1, false); r["reason"] != "not due" {
+		t.Fatalf("a run just after was %v", r)
+	}
+}
+
+func TestARotationAndASwitchEachGiveANewerGeneration(t *testing.T) {
+	mm := newMesh(t)
+	ctx := context.Background()
+	_, _ = mm.m.Consider(ctx, []Holdings{mm.login("laptop", "rt-a", true, t0)})
+	g0 := mm.state["laptop"].Generation
+	_, _ = mm.m.Rotate(ctx, licence1, true)
+	g1 := mm.state["laptop"].Generation
+	if g1 <= g0 {
+		t.Fatalf("a rotation went from %d to %d", g0, g1)
+	}
+	file := filepath.Join(t.TempDir(), "key")
+	_ = os.WriteFile(file, []byte("sk-ant-api-key\n"), 0o600)
+	if _, err := mm.m.AdoptKey(ctx, "api", file); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := mm.m.Bind(ctx, "laptop", "api", "test"); err != nil {
+		t.Fatal(err)
+	}
+	if mm.state["laptop"].Licence != "api" || mm.state["laptop"].Generation <= g1 {
+		t.Fatalf("a switch to a licence rotated less often went backwards: %v", mm.state["laptop"])
+	}
+	if _, err := mm.m.Release(ctx, "laptop", "test"); err != nil {
+		t.Fatal(err)
+	}
+	if _, ok := mm.state["laptop"]; ok {
+		t.Fatal("a released consumer still has a binding in the state")
+	}
+}
+
+func TestCurrentHandsAnAccessTokenOnlySealedToTheConsumersKey(t *testing.T) {
+	mm := newMesh(t)
+	ctx := context.Background()
+	_, _ = mm.m.Consider(ctx, []Holdings{mm.login("laptop", "rt-a", true, t0)})
+	node, _ := GenerateKeyPair()
+	answer, err := mm.m.Current(ctx, "laptop", node.PublicKey)
+	if err != nil || answer["kind"] != "subscription" {
+		t.Fatalf("%v %v", answer, err)
+	}
+	box := answer["sealed"].(SealedBox)
+	plain, err := Open(box, node.PrivateKey)
+	if err != nil {
+		t.Fatal(err)
+	}
+	var handed map[string]any
+	_ = json.Unmarshal([]byte(plain), &handed)
+	if !strings.HasPrefix(handed["accessToken"].(string), "at-") || handed["refreshToken"] != nil {
+		t.Fatalf("handed %v", handed)
+	}
+	other, _ := GenerateKeyPair()
+	if _, err := Open(box, other.PrivateKey); err == nil {
+		t.Fatal("the hand-over opened with another key")
+	}
+	if a, _ := mm.m.Current(ctx, "nobody", node.PublicKey); a != nil {
+		t.Fatalf("a consumer bound to nothing was answered %v", a)
+	}
+}
+
+func TestNothingTheManagerPublishesKeepsOrListsCarriesAToken(t *testing.T) {
+	mm := newMesh(t)
+	ctx := context.Background()
+	_, _ = mm.m.Consider(ctx, []Holdings{mm.login("laptop", "rt-secret-1", true, t0)})
+	_, _ = mm.m.Rotate(ctx, licence1, true)
+	_, _ = mm.m.Consider(ctx, []Holdings{mm.login("server", "rt-secret-dead", false, t0.Add(time.Hour))})
+	_ = mm.m.ReadUsage(ctx)
+	ls, _ := mm.m.Licences(ctx)
+	bs, _ := mm.store.Bindings(ctx)
+	everything, _ := json.Marshal([]any{mm.events, mm.state, ls, bs})
+	for _, token := range []string{"rt-secret", "rt-1", "rt-2", "at-1", "at-2", "local-"} {
+		if strings.Contains(string(everything), token) {
+			t.Fatalf("%s was published: %s", token, everything)
+		}
+	}
+	row, _ := mm.store.Licence(ctx, licence1)
+	if strings.Contains(row.Sealed, "rt-") {
+		t.Fatal("the grant is stored in the clear")
+	}
+}
+
+func TestANodeThatDoesNotAnswerIsAskedAgainAndOneWithNoLoginIsSettled(t *testing.T) {
+	mm := newMesh(t)
+	ctx := context.Background()
+	r := mm.login("laptop", "rt-a", true, t0)
+	mm.askDown = true
+	if adopted, _ := mm.m.Consider(ctx, []Holdings{r}); len(adopted) != 0 {
+		t.Fatalf("adopted %v from a node that did not answer", adopted)
+	}
+	if o, _ := mm.store.Outcome(ctx, Fingerprint("rt-a")); o != "" {
+		t.Fatalf("a node that was down was settled %q", o)
+	}
+	mm.askDown = false
+	if adopted, _ := mm.m.Consider(ctx, []Holdings{r}); len(adopted) != 1 {
+		t.Fatalf("adopted %v on the next pass", adopted)
+	}
+	gone := mm.report("server", "rt-gone", t0.Add(time.Second), "acct-2")
+	_, _ = mm.m.Consider(ctx, []Holdings{gone})
+	if o, _ := mm.store.Outcome(ctx, Fingerprint("rt-gone")); o != Gone {
+		t.Fatalf("outcome %q", o)
+	}
+}
+
+func TestAReportIsReadAsTheAgentModuleWritesIt(t *testing.T) {
+	// The agent module's own report shape (claude-code's holdingsOf), parsed here.
+	raw := `{"node":"laptop","identity":{"accountUuid":"u-1","emailAddress":"a@example.org"},"kind":"subscription",
+	  "refresh":{"present":true,"fingerprint":"sha256:0123456789abcdef","expiresAt":null},
+	  "access":{"fingerprint":"sha256:fedcba9876543210","expiresAt":1},"licence":null,"generation":0,
+	  "changedAt":"2026-10-04T11:00:00.000Z"}`
+	var h Holdings
+	if err := json.Unmarshal([]byte(raw), &h); err != nil {
+		t.Fatal(err)
+	}
+	if h.Node != "laptop" || h.Identity.AccountUUID != "u-1" || !h.Refresh.Present || h.Refresh.Fingerprint != "sha256:0123456789abcdef" {
+		t.Fatalf("%+v", h)
+	}
+	if _, err := time.Parse(time.RFC3339Nano, h.ChangedAt); err != nil {
+		t.Fatalf("the report's time does not parse: %v", err)
+	}
+}
+
+// A node whose report arrives after its account was adopted — with an older login, so never a candidate —
+// is still bound to that account's licence, once.
+func TestANodeReportingAnAdoptedAccountLaterIsBoundToIt(t *testing.T) {
+	mm := newMesh(t)
+	ctx := context.Background()
+	_, _ = mm.m.Consider(ctx, []Holdings{mm.login("novox", "rt-new", true, t0)})
+	late := mm.login("laptop", "rt-older", true, t0.Add(-24*time.Hour))
+	_, _ = mm.m.Consider(ctx, []Holdings{late})
+	if mm.state["laptop"].Licence != licence1 {
+		t.Fatalf("a node reporting the adopted account later was not bound: %v", mm.state)
+	}
+	if strings.Contains(strings.Join(mm.vendor.exchanged, ","), "rt-older") {
+		t.Fatal("the older login was exchanged")
+	}
+	g := mm.state["laptop"].Generation
+	_, _ = mm.m.Consider(ctx, []Holdings{late})
+	if mm.state["laptop"].Generation != g {
+		t.Fatal("a node already bound was bound again")
+	}
+}

modules/claude-licence-manager/cmd/claude-licence-manager/pgstore.go

@@ -0,0 +1,281 @@
+package main
+
+// The store on the mesh's postgres (novox/hq design 39 §1), the database the mesh provisioned for this
+// module. The schema is brought to this version's shape by the preparation step (ADR 0135), each
+// statement idempotent.
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"os"
+	"strings"
+	"time"
+
+	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgxpool"
+)
+
+// Schema is what this version needs.
+var Schema = []string{
+	`create table if not exists licence (
+	   name text primary key,
+	   kind text not null check (kind in ('subscription', 'api-key')),
+	   account_uuid text unique,
+	   email text,
+	   organization_uuid text,
+	   sealed text,
+	   refresh_fingerprint text,
+	   access_expires_at bigint,
+	   refresh_expires_at bigint,
+	   failures integer not null default 0,
+	   notified_at bigint,
+	   adopted_at bigint not null,
+	   rotated_at bigint)`,
+	`create sequence if not exists binding_generation`,
+	`create table if not exists binding (
+	   consumer text primary key,
+	   licence text not null references licence(name),
+	   generation bigint not null)`,
+	`create table if not exists lease (
+	   key text primary key,
+	   holder text not null,
+	   until timestamptz not null)`,
+	`create table if not exists offered (
+	   fingerprint text primary key,
+	   node text not null,
+	   account_uuid text,
+	   outcome text not null,
+	   why text not null,
+	   at timestamptz not null default now())`,
+	`create table if not exists usage (
+	   licence text not null,
+	   at bigint not null,
+	   reading jsonb not null,
+	   raw jsonb not null)`,
+	`create index if not exists usage_by_licence on usage (licence, at desc)`,
+	`create table if not exists audit (
+	   at timestamptz not null default now(),
+	   what text not null,
+	   detail jsonb not null)`,
+}
+
+// PgStore is the store on postgres.
+type PgStore struct{ pool *pgxpool.Pool }
+
+// PgStoreFromEnv opens the store the mesh provisioned, its URL in the file DATABASE_URL_FILE names.
+func PgStoreFromEnv(ctx context.Context) (*PgStore, error) {
+	file := os.Getenv("DATABASE_URL_FILE")
+	if file == "" {
+		return nil, errors.New("DATABASE_URL_FILE is not set: the manager's database is a requirement the mesh resolves")
+	}
+	raw, err := os.ReadFile(file)
+	if err != nil {
+		return nil, err
+	}
+	return OpenPgStore(ctx, strings.TrimSpace(string(raw)))
+}
+
+// OpenPgStore opens a store at a URL.
+func OpenPgStore(ctx context.Context, url string) (*PgStore, error) {
+	pool, err := pgxpool.New(ctx, url)
+	if err != nil {
+		return nil, err
+	}
+	return &PgStore{pool: pool}, nil
+}
+
+// Migrate brings the schema to this version's shape.
+func (s *PgStore) Migrate(ctx context.Context) error {
+	for _, q := range Schema {
+		if _, err := s.pool.Exec(ctx, q); err != nil {
+			return fmt.Errorf("%s: %w", strings.Fields(q)[0:6], err)
+		}
+	}
+	return nil
+}
+
+const licenceColumns = `name, kind, coalesce(account_uuid,''), coalesce(email,''), coalesce(organization_uuid,''),
+  coalesce(sealed,''), coalesce(refresh_fingerprint,''), coalesce(access_expires_at,0), coalesce(refresh_expires_at,0),
+  failures, coalesce(notified_at,0), adopted_at, coalesce(rotated_at,0)`
+
+func scanLicence(row pgx.Row) (*Licence, error) {
+	var l Licence
+	err := row.Scan(&l.Name, &l.Kind, &l.AccountUUID, &l.Email, &l.OrganizationUUID, &l.Sealed, &l.RefreshFingerprint,
+		&l.AccessExpiresAt, &l.RefreshExpiresAt, &l.Failures, &l.NotifiedAt, &l.AdoptedAt, &l.RotatedAt)
+	if errors.Is(err, pgx.ErrNoRows) {
+		return nil, nil
+	}
+	return &l, err
+}
+
+func (s *PgStore) Licences(ctx context.Context) ([]Licence, error) {
+	rows, err := s.pool.Query(ctx, `select `+licenceColumns+` from licence order by name`)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var out []Licence
+	for rows.Next() {
+		l, err := scanLicence(rows)
+		if err != nil {
+			return nil, err
+		}
+		out = append(out, *l)
+	}
+	return out, rows.Err()
+}
+
+func (s *PgStore) Licence(ctx context.Context, name string) (*Licence, error) {
+	return scanLicence(s.pool.QueryRow(ctx, `select `+licenceColumns+` from licence where name = $1`, name))
+}
+
+func (s *PgStore) LicenceForAccount(ctx context.Context, account string) (*Licence, error) {
+	return scanLicence(s.pool.QueryRow(ctx, `select `+licenceColumns+` from licence where account_uuid = $1`, account))
+}
+
+func nullable(s string) any {
+	if s == "" {
+		return nil
+	}
+	return s
+}
+
+func nullableInt(v int64) any {
+	if v == 0 {
+		return nil
+	}
+	return v
+}
+
+func (s *PgStore) SaveLicence(ctx context.Context, l Licence) error {
+	_, err := s.pool.Exec(ctx, `insert into licence (name, kind, account_uuid, email, organization_uuid, sealed, refresh_fingerprint,
+	    access_expires_at, refresh_expires_at, failures, notified_at, adopted_at, rotated_at)
+	  values ($1,$2,$3,$4,$5,$6,$7,$8,$9,$10,$11,$12,$13)
+	  on conflict (name) do update set kind = excluded.kind, account_uuid = excluded.account_uuid, email = excluded.email,
+	    organization_uuid = excluded.organization_uuid, sealed = excluded.sealed, refresh_fingerprint = excluded.refresh_fingerprint,
+	    access_expires_at = excluded.access_expires_at, refresh_expires_at = excluded.refresh_expires_at,
+	    failures = excluded.failures, notified_at = excluded.notified_at, adopted_at = excluded.adopted_at,
+	    rotated_at = excluded.rotated_at`,
+		l.Name, l.Kind, nullable(l.AccountUUID), nullable(l.Email), nullable(l.OrganizationUUID), nullable(l.Sealed),
+		nullable(l.RefreshFingerprint), nullableInt(l.AccessExpiresAt), nullableInt(l.RefreshExpiresAt), l.Failures,
+		nullableInt(l.NotifiedAt), l.AdoptedAt, nullableInt(l.RotatedAt))
+	return err
+}
+
+// Lease is taken in the store before a row is read (design 39 §3): a second run started together finds
+// it live and does nothing.
+func (s *PgStore) Lease(ctx context.Context, key, holder string, d time.Duration) (bool, error) {
+	tag, err := s.pool.Exec(ctx, `insert into lease (key, holder, until) values ($1, $2, now() + make_interval(secs => $3))
+	  on conflict (key) do update set holder = excluded.holder, until = excluded.until
+	    where lease.until < now() or lease.holder = excluded.holder`, key, holder, d.Seconds())
+	if err != nil {
+		return false, err
+	}
+	return tag.RowsAffected() == 1, nil
+}
+
+func (s *PgStore) Unlease(ctx context.Context, key, holder string) error {
+	_, err := s.pool.Exec(ctx, `delete from lease where key = $1 and holder = $2`, key, holder)
+	return err
+}
+
+func (s *PgStore) bindingsWhere(ctx context.Context, q string, args ...any) ([]Binding, error) {
+	rows, err := s.pool.Query(ctx, q, args...)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var out []Binding
+	for rows.Next() {
+		var b Binding
+		if err := rows.Scan(&b.Consumer, &b.Licence, &b.Generation); err != nil {
+			return nil, err
+		}
+		out = append(out, b)
+	}
+	return out, rows.Err()
+}
+
+func (s *PgStore) Bindings(ctx context.Context) ([]Binding, error) {
+	return s.bindingsWhere(ctx, `select consumer, licence, generation from binding order by consumer`)
+}
+
+func (s *PgStore) Binding(ctx context.Context, consumer string) (*Binding, error) {
+	out, err := s.bindingsWhere(ctx, `select consumer, licence, generation from binding where consumer = $1`, consumer)
+	if err != nil || len(out) == 0 {
+		return nil, err
+	}
+	return &out[0], nil
+}
+
+func (s *PgStore) Bind(ctx context.Context, consumer, licence string) (Binding, error) {
+	out, err := s.bindingsWhere(ctx, `insert into binding (consumer, licence, generation) values ($1, $2, nextval('binding_generation'))
+	  on conflict (consumer) do update set licence = excluded.licence, generation = excluded.generation
+	  returning consumer, licence, generation`, consumer, licence)
+	if err != nil {
+		return Binding{}, err
+	}
+	return out[0], nil
+}
+
+func (s *PgStore) Unbind(ctx context.Context, consumer string) (bool, error) {
+	tag, err := s.pool.Exec(ctx, `delete from binding where consumer = $1`, consumer)
+	return err == nil && tag.RowsAffected() == 1, err
+}
+
+func (s *PgStore) Advance(ctx context.Context, licence string) ([]Binding, error) {
+	return s.bindingsWhere(ctx, `update binding set generation = nextval('binding_generation') where licence = $1
+	  returning consumer, licence, generation`, licence)
+}
+
+func (s *PgStore) Outcome(ctx context.Context, fp string) (Outcome, error) {
+	var o string
+	err := s.pool.QueryRow(ctx, `select outcome from offered where fingerprint = $1`, fp).Scan(&o)
+	if errors.Is(err, pgx.ErrNoRows) {
+		return "", nil
+	}
+	return Outcome(o), err
+}
+
+func (s *PgStore) RecordOutcome(ctx context.Context, fp, node, account string, o Outcome, why string) error {
+	_, err := s.pool.Exec(ctx, `insert into offered (fingerprint, node, account_uuid, outcome, why) values ($1,$2,$3,$4,$5)
+	  on conflict (fingerprint) do update set outcome = excluded.outcome, why = excluded.why, at = now()`,
+		fp, node, nullable(account), string(o), why)
+	return err
+}
+
+func (s *PgStore) RecordUsage(ctx context.Context, licence string, at int64, r UsageReading, raw map[string]any) error {
+	reading, _ := json.Marshal(r)
+	rawJSON, _ := json.Marshal(raw)
+	_, err := s.pool.Exec(ctx, `insert into usage (licence, at, reading, raw) values ($1,$2,$3,$4)`, licence, at, reading, rawJSON)
+	return err
+}
+
+func (s *PgStore) Usage(ctx context.Context, licence string, limit int) ([]UsageRow, error) {
+	rows, err := s.pool.Query(ctx, `select licence, at, reading from usage where ($1 = '' or licence = $1) order by at desc limit $2`, licence, limit)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var out []UsageRow
+	for rows.Next() {
+		var u UsageRow
+		var reading []byte
+		if err := rows.Scan(&u.Licence, &u.At, &reading); err != nil {
+			return nil, err
+		}
+		_ = json.Unmarshal(reading, &u.Reading)
+		out = append(out, u)
+	}
+	return out, rows.Err()
+}
+
+func (s *PgStore) Audit(ctx context.Context, what string, detail map[string]any) error {
+	raw, _ := json.Marshal(detail)
+	_, err := s.pool.Exec(ctx, `insert into audit (what, detail) values ($1, $2)`, what, raw)
+	return err
+}
+
+func (s *PgStore) Close() { s.pool.Close() }

modules/claude-licence-manager/cmd/claude-licence-manager/seal.go

@@ -0,0 +1,189 @@
+package main
+
+// Sealing to one recipient (novox/hq ADR 0183, ADR 0206): the manager seals what it hands a consumer to
+// the key that consumer sent, and a node seals a waiting login to the key the manager gives. The same box
+// the agent module's TypeScript makes and opens, byte for byte — X25519 for the agreement, HKDF-SHA256 for
+// the key, AES-256-GCM for the box — so `testdata/sealed-by-typescript.json` is opened here, and a test
+// reopens what this seals with the same derivation.
+//
+// A box is `{ v: 1, eph, iv, tag, ct }`, every field base64; `eph` is the one-time public key as SPKI DER,
+// and the key is bound to it and to the recipient's raw public key, so a box cannot be re-addressed.
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/ecdh"
+	"crypto/hkdf"
+	"crypto/rand"
+	"crypto/sha256"
+	"crypto/x509"
+	"encoding/base64"
+	"encoding/pem"
+	"errors"
+	"fmt"
+)
+
+// SealedBox is a value sealed to one recipient.
+type SealedBox struct {
+	V   int    `json:"v"`
+	Eph string `json:"eph"`
+	IV  string `json:"iv"`
+	Tag string `json:"tag"`
+	Ct  string `json:"ct"`
+}
+
+// KeyPair is a recipient's keypair as the two PEM strings it is kept and sent as.
+type KeyPair struct {
+	PublicKey  string `json:"publicKey"`
+	PrivateKey string `json:"privateKey"`
+}
+
+const sealInfo = "novox-mesh sealed box v1"
+
+// GenerateKeyPair makes an X25519 keypair, PEM-encoded as the agent module's are.
+func GenerateKeyPair() (KeyPair, error) {
+	priv, err := ecdh.X25519().GenerateKey(rand.Reader)
+	if err != nil {
+		return KeyPair{}, err
+	}
+	pubDER, err := x509.MarshalPKIXPublicKey(priv.PublicKey())
+	if err != nil {
+		return KeyPair{}, err
+	}
+	privDER, err := x509.MarshalPKCS8PrivateKey(priv)
+	if err != nil {
+		return KeyPair{}, err
+	}
+	return KeyPair{
+		PublicKey:  string(pem.EncodeToMemory(&pem.Block{Type: "PUBLIC KEY", Bytes: pubDER})),
+		PrivateKey: string(pem.EncodeToMemory(&pem.Block{Type: "PRIVATE KEY", Bytes: privDER})),
+	}, nil
+}
+
+func publicFromPEM(p string) (*ecdh.PublicKey, error) {
+	block, _ := pem.Decode([]byte(p))
+	if block == nil {
+		return nil, errors.New("not a PEM public key")
+	}
+	k, err := x509.ParsePKIXPublicKey(block.Bytes)
+	if err != nil {
+		return nil, err
+	}
+	pub, ok := k.(*ecdh.PublicKey)
+	if !ok || pub.Curve() != ecdh.X25519() {
+		return nil, errors.New("not an X25519 public key")
+	}
+	return pub, nil
+}
+
+func privateFromPEM(p string) (*ecdh.PrivateKey, error) {
+	block, _ := pem.Decode([]byte(p))
+	if block == nil {
+		return nil, errors.New("not a PEM private key")
+	}
+	k, err := x509.ParsePKCS8PrivateKey(block.Bytes)
+	if err != nil {
+		return nil, err
+	}
+	priv, ok := k.(*ecdh.PrivateKey)
+	if !ok || priv.Curve() != ecdh.X25519() {
+		return nil, errors.New("not an X25519 private key")
+	}
+	return priv, nil
+}
+
+func boxKey(secret, ephDER, recipientRaw []byte) ([]byte, error) {
+	salt := append(append([]byte{}, ephDER...), recipientRaw...)
+	return hkdf.Key(sha256.New, secret, salt, sealInfo, 32)
+}
+
+// Seal seals plaintext to the recipient's public key.
+func Seal(plaintext, recipientPEM string) (SealedBox, error) {
+	recipient, err := publicFromPEM(recipientPEM)
+	if err != nil {
+		return SealedBox{}, err
+	}
+	eph, err := ecdh.X25519().GenerateKey(rand.Reader)
+	if err != nil {
+		return SealedBox{}, err
+	}
+	secret, err := eph.ECDH(recipient)
+	if err != nil {
+		return SealedBox{}, err
+	}
+	ephDER, err := x509.MarshalPKIXPublicKey(eph.PublicKey())
+	if err != nil {
+		return SealedBox{}, err
+	}
+	key, err := boxKey(secret, ephDER, recipient.Bytes())
+	if err != nil {
+		return SealedBox{}, err
+	}
+	gcm, err := newGCM(key)
+	if err != nil {
+		return SealedBox{}, err
+	}
+	iv := make([]byte, 12)
+	if _, err := rand.Read(iv); err != nil {
+		return SealedBox{}, err
+	}
+	out := gcm.Seal(nil, iv, []byte(plaintext), nil)
+	ct, tag := out[:len(out)-gcm.Overhead()], out[len(out)-gcm.Overhead():]
+	b64 := base64.StdEncoding.EncodeToString
+	return SealedBox{V: 1, Eph: b64(ephDER), IV: b64(iv), Tag: b64(tag), Ct: b64(ct)}, nil
+}
+
+// Open opens a box with the recipient's private key; it fails for a box to another key or one tampered with.
+func Open(box SealedBox, privatePEM string) (string, error) {
+	if box.V != 1 {
+		return "", errors.New("not a sealed box this module can open")
+	}
+	priv, err := privateFromPEM(privatePEM)
+	if err != nil {
+		return "", err
+	}
+	d := base64.StdEncoding.DecodeString
+	ephDER, err := d(box.Eph)
+	if err != nil {
+		return "", fmt.Errorf("the box's eph: %w", err)
+	}
+	ephKey, err := x509.ParsePKIXPublicKey(ephDER)
+	if err != nil {
+		return "", err
+	}
+	eph, ok := ephKey.(*ecdh.PublicKey)
+	if !ok {
+		return "", errors.New("the box's eph is not an X25519 key")
+	}
+	secret, err := priv.ECDH(eph)
+	if err != nil {
+		return "", err
+	}
+	key, err := boxKey(secret, ephDER, priv.PublicKey().Bytes())
+	if err != nil {
+		return "", err
+	}
+	iv, err1 := d(box.IV)
+	tag, err2 := d(box.Tag)
+	ct, err3 := d(box.Ct)
+	if err := errors.Join(err1, err2, err3); err != nil {
+		return "", err
+	}
+	gcm, err := newGCM(key)
+	if err != nil {
+		return "", err
+	}
+	plain, err := gcm.Open(nil, iv, append(ct, tag...), nil)
+	if err != nil {
+		return "", errors.New("the box does not open with this key")
+	}
+	return string(plain), nil
+}
+
+func newGCM(key []byte) (cipher.AEAD, error) {
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+	return cipher.NewGCM(block)
+}

modules/claude-licence-manager/cmd/claude-licence-manager/seal_test.go

@@ -0,0 +1,43 @@
+package main
+
+import (
+	"encoding/json"
+	"os"
+	"testing"
+)
+
+// A box the agent module's TypeScript sealed opens here: the two implementations are one format.
+func TestABoxSealedInTypeScriptOpensInGo(t *testing.T) {
+	raw, err := os.ReadFile("testdata/sealed-by-typescript.json")
+	if err != nil {
+		t.Fatal(err)
+	}
+	var f struct {
+		PrivateKey string    `json:"privateKey"`
+		Box        SealedBox `json:"box"`
+		Plaintext  string    `json:"plaintext"`
+	}
+	if err := json.Unmarshal(raw, &f); err != nil {
+		t.Fatal(err)
+	}
+	got, err := Open(f.Box, f.PrivateKey)
+	if err != nil || got != f.Plaintext {
+		t.Fatalf("opened %q, %v", got, err)
+	}
+}
+
+// What Go seals opens with its own key and no other.
+func TestABoxOpensOnlyForItsRecipient(t *testing.T) {
+	a, _ := GenerateKeyPair()
+	b, _ := GenerateKeyPair()
+	box, err := Seal("a token", a.PublicKey)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if got, err := Open(box, a.PrivateKey); err != nil || got != "a token" {
+		t.Fatalf("opened %q, %v", got, err)
+	}
+	if _, err := Open(box, b.PrivateKey); err == nil {
+		t.Fatal("a box opened for another key")
+	}
+}

modules/claude-licence-manager/cmd/claude-licence-manager/store.go

@@ -0,0 +1,263 @@
+package main
+
+// The manager's store (novox/hq ADR 0183, design 39 §1): licences with their grants encrypted, bindings
+// with a generation, what became of each login it was offered, usage readings, and the audit. One
+// interface, two implementations — postgres for the mesh (pgstore.go), memory for the tests — so every
+// rule is tested without a database, and the database is asked only to keep rows.
+
+import (
+	"context"
+	"sort"
+	"sync"
+	"time"
+)
+
+// Licence is one licence: an account, or an API key.
+type Licence struct {
+	Name               string `json:"name"`
+	Kind               string `json:"kind"` // subscription | api-key
+	AccountUUID        string `json:"accountUuid,omitempty"`
+	Email              string `json:"email,omitempty"`
+	OrganizationUUID   string `json:"organizationUuid,omitempty"`
+	Sealed             string `json:"-"` // the grant or the key, encrypted at rest
+	RefreshFingerprint string `json:"-"`
+	AccessExpiresAt    int64  `json:"accessExpiresAt,omitempty"`
+	RefreshExpiresAt   int64  `json:"refreshExpiresAt,omitempty"`
+	Failures           int    `json:"failures"`
+	NotifiedAt         int64  `json:"-"`
+	AdoptedAt          int64  `json:"adoptedAt"`
+	RotatedAt          int64  `json:"rotatedAt,omitempty"`
+}
+
+// Binding is one consumer's binding and the generation it was last given (ADR 0206).
+type Binding struct {
+	Consumer   string `json:"consumer"`
+	Licence    string `json:"licence"`
+	Generation int64  `json:"generation"`
+}
+
+// Outcome is what became of a login the manager was offered, by its refresh token's fingerprint.
+type Outcome string
+
+const (
+	Adopted Outcome = "adopted"
+	Dead    Outcome = "dead"
+	Skipped Outcome = "skipped"
+	Refused Outcome = "refused"
+	Gone    Outcome = "gone"
+)
+
+// UsageRow is one usage reading.
+type UsageRow struct {
+	Licence string       `json:"licence"`
+	At      int64        `json:"at"`
+	Reading UsageReading `json:"reading"`
+}
+
+// Store is what the manager keeps.
+type Store interface {
+	Licences(ctx context.Context) ([]Licence, error)
+	Licence(ctx context.Context, name string) (*Licence, error)
+	LicenceForAccount(ctx context.Context, account string) (*Licence, error)
+	SaveLicence(ctx context.Context, l Licence) error
+	// Lease takes a lease for d, or answers false while another holder's is live.
+	Lease(ctx context.Context, key, holder string, d time.Duration) (bool, error)
+	Unlease(ctx context.Context, key, holder string) error
+	Bindings(ctx context.Context) ([]Binding, error)
+	Binding(ctx context.Context, consumer string) (*Binding, error)
+	// Bind binds (or switches) a consumer at the next generation.
+	Bind(ctx context.Context, consumer, licence string) (Binding, error)
+	Unbind(ctx context.Context, consumer string) (bool, error)
+	// Advance gives every consumer of a licence a new generation: what a rotation is to them.
+	Advance(ctx context.Context, licence string) ([]Binding, error)
+	Outcome(ctx context.Context, fingerprint string) (Outcome, error)
+	RecordOutcome(ctx context.Context, fingerprint, node, account string, o Outcome, why string) error
+	RecordUsage(ctx context.Context, licence string, at int64, r UsageReading, raw map[string]any) error
+	Usage(ctx context.Context, licence string, limit int) ([]UsageRow, error)
+	Audit(ctx context.Context, what string, detail map[string]any) error
+	Close()
+}
+
+// MemoryStore is the tests' store.
+type MemoryStore struct {
+	mu     sync.Mutex
+	now    func() time.Time
+	rows   map[string]Licence
+	binds  map[string]Binding
+	leases map[string]struct {
+		holder string
+		until  time.Time
+	}
+	outcomes   map[string]Outcome
+	usage      []UsageRow
+	Audits     []map[string]any
+	generation int64
+}
+
+// NewMemoryStore is an empty store whose leases age by now.
+func NewMemoryStore(now func() time.Time) *MemoryStore {
+	return &MemoryStore{now: now, rows: map[string]Licence{}, binds: map[string]Binding{},
+		leases: map[string]struct {
+			holder string
+			until  time.Time
+		}{}, outcomes: map[string]Outcome{}}
+}
+
+func (m *MemoryStore) Licences(context.Context) ([]Licence, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	out := make([]Licence, 0, len(m.rows))
+	for _, l := range m.rows {
+		out = append(out, l)
+	}
+	sort.Slice(out, func(i, j int) bool { return out[i].Name < out[j].Name })
+	return out, nil
+}
+
+func (m *MemoryStore) Licence(_ context.Context, name string) (*Licence, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if l, ok := m.rows[name]; ok {
+		return &l, nil
+	}
+	return nil, nil
+}
+
+func (m *MemoryStore) LicenceForAccount(_ context.Context, account string) (*Licence, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	for _, l := range m.rows {
+		if l.AccountUUID == account {
+			return &l, nil
+		}
+	}
+	return nil, nil
+}
+
+func (m *MemoryStore) SaveLicence(_ context.Context, l Licence) error {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	m.rows[l.Name] = l
+	return nil
+}
+
+func (m *MemoryStore) Lease(_ context.Context, key, holder string, d time.Duration) (bool, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if held, ok := m.leases[key]; ok && held.until.After(m.now()) && held.holder != holder {
+		return false, nil
+	}
+	m.leases[key] = struct {
+		holder string
+		until  time.Time
+	}{holder, m.now().Add(d)}
+	return true, nil
+}
+
+func (m *MemoryStore) Unlease(_ context.Context, key, holder string) error {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if m.leases[key].holder == holder {
+		delete(m.leases, key)
+	}
+	return nil
+}
+
+func (m *MemoryStore) Bindings(context.Context) ([]Binding, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	out := make([]Binding, 0, len(m.binds))
+	for _, b := range m.binds {
+		out = append(out, b)
+	}
+	sort.Slice(out, func(i, j int) bool { return out[i].Consumer < out[j].Consumer })
+	return out, nil
+}
+
+func (m *MemoryStore) Binding(_ context.Context, consumer string) (*Binding, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if b, ok := m.binds[consumer]; ok {
+		return &b, nil
+	}
+	return nil, nil
+}
+
+func (m *MemoryStore) Bind(_ context.Context, consumer, licence string) (Binding, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	m.generation++
+	b := Binding{Consumer: consumer, Licence: licence, Generation: m.generation}
+	m.binds[consumer] = b
+	return b, nil
+}
+
+func (m *MemoryStore) Unbind(_ context.Context, consumer string) (bool, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	_, ok := m.binds[consumer]
+	delete(m.binds, consumer)
+	return ok, nil
+}
+
+func (m *MemoryStore) Advance(_ context.Context, licence string) ([]Binding, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	var out []Binding
+	for c, b := range m.binds {
+		if b.Licence != licence {
+			continue
+		}
+		m.generation++
+		b.Generation = m.generation
+		m.binds[c] = b
+		out = append(out, b)
+	}
+	sort.Slice(out, func(i, j int) bool { return out[i].Consumer < out[j].Consumer })
+	return out, nil
+}
+
+func (m *MemoryStore) Outcome(_ context.Context, fp string) (Outcome, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	return m.outcomes[fp], nil
+}
+
+func (m *MemoryStore) RecordOutcome(_ context.Context, fp, _, _ string, o Outcome, _ string) error {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	m.outcomes[fp] = o
+	return nil
+}
+
+func (m *MemoryStore) RecordUsage(_ context.Context, licence string, at int64, r UsageReading, _ map[string]any) error {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	m.usage = append(m.usage, UsageRow{Licence: licence, At: at, Reading: r})
+	return nil
+}
+
+func (m *MemoryStore) Usage(_ context.Context, licence string, limit int) ([]UsageRow, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	var out []UsageRow
+	for i := len(m.usage) - 1; i >= 0 && len(out) < limit; i-- {
+		if licence == "" || m.usage[i].Licence == licence {
+			out = append(out, m.usage[i])
+		}
+	}
+	return out, nil
+}
+
+func (m *MemoryStore) Audit(_ context.Context, what string, detail map[string]any) error {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	d := map[string]any{"what": what}
+	for k, v := range detail {
+		d[k] = v
+	}
+	m.Audits = append(m.Audits, d)
+	return nil
+}
+
+func (m *MemoryStore) Close() {}

modules/claude-licence-manager/cmd/claude-licence-manager/store_test.go

@@ -0,0 +1,125 @@
+package main
+
+import (
+	"context"
+	"os"
+	"strings"
+	"testing"
+	"time"
+)
+
+// Against a real postgres, because the questions are the database's: does the schema apply twice, does a
+// lease refuse a second holder, does a generation only grow. Skipped unless one is named:
+//
+//	docker run -d --rm --name licmgr-pg -e POSTGRES_PASSWORD=t -p 15498:5432 postgres:16-alpine
+//	MESH_TEST_POSTGRES=postgres://postgres:t@127.0.0.1:15498/postgres go test ./...
+func TestTheStoreOnPostgres(t *testing.T) {
+	url := os.Getenv("MESH_TEST_POSTGRES")
+	if url == "" {
+		t.Skip("MESH_TEST_POSTGRES unset")
+	}
+	ctx := context.Background()
+	s, err := OpenPgStore(ctx, url)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer s.Close()
+	for _, table := range []string{"binding", "licence", "lease", "offered", "usage", "audit"} {
+		_, _ = s.pool.Exec(ctx, "drop table if exists "+table+" cascade")
+	}
+	_, _ = s.pool.Exec(ctx, "drop sequence if exists binding_generation")
+	for i := 0; i < 2; i++ {
+		if err := s.Migrate(ctx); err != nil {
+			t.Fatalf("migration %d: %v", i+1, err)
+		}
+	}
+	l := Licence{Name: "a@example.org", Kind: "subscription", AccountUUID: "u-1", Email: "a@example.org", Sealed: "v1.x.y",
+		RefreshFingerprint: "sha256:1", AccessExpiresAt: 1, RefreshExpiresAt: 2, AdoptedAt: 3}
+	if err := s.SaveLicence(ctx, l); err != nil {
+		t.Fatal(err)
+	}
+	l.Failures = 2
+	_ = s.SaveLicence(ctx, l)
+	if got, _ := s.LicenceForAccount(ctx, "u-1"); got == nil || got.Failures != 2 || got.OrganizationUUID != "" {
+		t.Fatalf("%+v", got)
+	}
+	if none, err := s.Licence(ctx, "nobody"); none != nil || err != nil {
+		t.Fatalf("%v %v", none, err)
+	}
+	lease := func(holder string) bool {
+		ok, err := s.Lease(ctx, "licence:a", holder, time.Minute)
+		if err != nil {
+			t.Fatal(err)
+		}
+		return ok
+	}
+	if !lease("one") || lease("two") || !lease("one") {
+		t.Fatal("a lease did not refuse a second holder, or its own holder could not renew it")
+	}
+	_ = s.Unlease(ctx, "licence:a", "one")
+	if !lease("two") {
+		t.Fatal("a released lease was not taken")
+	}
+	b1, _ := s.Bind(ctx, "laptop", l.Name)
+	adv, _ := s.Advance(ctx, l.Name)
+	b3, _ := s.Bind(ctx, "laptop", l.Name)
+	if len(adv) != 1 || !(b1.Generation < adv[0].Generation && adv[0].Generation < b3.Generation) {
+		t.Fatalf("generations %d %v %d", b1.Generation, adv, b3.Generation)
+	}
+	_ = s.RecordOutcome(ctx, "sha256:x", "laptop", "u-1", Dead, "400")
+	if o, _ := s.Outcome(ctx, "sha256:x"); o != Dead {
+		t.Fatalf("outcome %q", o)
+	}
+	if o, _ := s.Outcome(ctx, "sha256:none"); o != "" {
+		t.Fatalf("an unknown login is %q", o)
+	}
+	pct := 1.0
+	_ = s.RecordUsage(ctx, l.Name, 5, UsageReading{SessionPct: &pct}, map[string]any{})
+	if u, _ := s.Usage(ctx, "", 5); len(u) != 1 || *u[0].Reading.SessionPct != 1 {
+		t.Fatalf("usage %v", u)
+	}
+	if err := s.Audit(ctx, "bound", map[string]any{"consumer": "laptop"}); err != nil {
+		t.Fatal(err)
+	}
+	if ok, _ := s.Unbind(ctx, "laptop"); !ok {
+		t.Fatal("unbind")
+	}
+	all, _ := s.Licences(ctx)
+	if len(all) != 1 || !strings.HasPrefix(all[0].Sealed, "v1.") {
+		t.Fatalf("%v", all)
+	}
+}
+
+func TestARefreshThatDoesNotRotateKeepsTheRefreshToken(t *testing.T) {
+	prev := FullGrant{AccessToken: "a", RefreshToken: "r", ExpiresAt: 1}
+	in := int64(60)
+	kept := NextGrant(prev, tokenResponse{AccessToken: "a2", ExpiresIn: &in}, 1000)
+	if !kept.OK || kept.Grant.RefreshToken != "r" || kept.Grant.ExpiresAt != 61_000 {
+		t.Fatalf("%+v", kept)
+	}
+	rotated := NextGrant(prev, tokenResponse{AccessToken: "a3", RefreshToken: "r2"}, 0)
+	if rotated.Grant.RefreshToken != "r2" {
+		t.Fatalf("%+v", rotated)
+	}
+	if NextGrant(prev, tokenResponse{}, 0).OK {
+		t.Fatal("an answer with no access token was a grant")
+	}
+}
+
+func TestAGrantAtRestOpensOnlyWithItsKey(t *testing.T) {
+	a, _ := NewCrypt("one key")
+	b, _ := NewCrypt("another key")
+	sealed := a.Seal(`{"refreshToken":"rt"}`)
+	if strings.Contains(sealed, "rt") {
+		t.Fatal("stored in the clear")
+	}
+	if got, err := a.Open(sealed); err != nil || got != `{"refreshToken":"rt"}` {
+		t.Fatalf("%q %v", got, err)
+	}
+	if _, err := b.Open(sealed); err == nil {
+		t.Fatal("opened with another key")
+	}
+	if _, err := NewCrypt("  "); err == nil {
+		t.Fatal("an empty key was accepted")
+	}
+}

modules/claude-licence-manager/cmd/claude-licence-manager/testdata/sealed-by-typescript.json

@@ -0,0 +1,12 @@
+{
+  "privateKey": "-----BEGIN PRIVATE KEY-----\nMC4CAQAwBQYDK2VuBCIEIAi2NK/bN+p7cqYUwv/kz72TgLdmJUfOHCDZTrMpQzpS\n-----END PRIVATE KEY-----\n",
+  "publicKey": "-----BEGIN PUBLIC KEY-----\nMCowBQYDK2VuAyEARYvD/w+9ah0KWS9T9pd6Ea6CBymUE48vEVk983QPKyY=\n-----END PUBLIC KEY-----\n",
+  "box": {
+    "v": 1,
+    "eph": "MCowBQYDK2VuAyEAIYlSGrJvF8qSjR1aTFWbEQM/NFbZXrarglN0aRLZZ0E=",
+    "iv": "ABqT/hMukn6+xpjh",
+    "tag": "POzmsWTPHSn9xLMMJJ9Akg==",
+    "ct": "m2u0kuQ0PwrsGelM99Z5aBw6FCd6lFISUbwiK5TzzDw4ZrGtsHEvxytoIeFC"
+  },
+  "plaintext": "a grant sealed by the TypeScript agent module"
+}

modules/claude-licence-manager/cmd/claude-licence-manager/vendor.go

@@ -0,0 +1,187 @@
+package main
+
+// The only file that talks to Anthropic (novox/hq ADR 0183): the token endpoint, which this module alone
+// calls — one rotation source — and the usage endpoint. Ported from the predecessor's manager, whose
+// client id and error handling were each earned by an incident.
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"os"
+	"strings"
+	"time"
+)
+
+// The public Claude Code client's id: not a secret, and a hard-won constant — a metadata URL in its place
+// answers 400, which the predecessor once misdiagnosed as a dead grant.
+const clientID = "9d1c250a-e61b-44d9-88ed-5944d1962f5e"
+
+func tokenEndpoint() string {
+	if v := os.Getenv("MESH_ANTHROPIC_TOKEN_ENDPOINT"); v != "" {
+		return v
+	}
+	return "https://platform.claude.com/v1/oauth/token"
+}
+
+func usageEndpoint() string {
+	if v := os.Getenv("MESH_ANTHROPIC_USAGE_ENDPOINT"); v != "" {
+		return v
+	}
+	return "https://api.anthropic.com/api/oauth/usage"
+}
+
+// FullGrant is a subscription's grant as this module keeps it: what the agent's credentials file calls
+// `claudeAiOauth`.
+type FullGrant struct {
+	AccessToken           string   `json:"accessToken"`
+	RefreshToken          string   `json:"refreshToken"`
+	ExpiresAt             int64    `json:"expiresAt"`
+	RefreshTokenExpiresAt *int64   `json:"refreshTokenExpiresAt,omitempty"`
+	Scopes                []string `json:"scopes,omitempty"`
+	SubscriptionType      string   `json:"subscriptionType,omitempty"`
+	RateLimitTier         string   `json:"rateLimitTier,omitempty"`
+}
+
+// Refreshed is what a refresh came to: the next grant and the account the vendor answered for, or why not.
+type Refreshed struct {
+	OK      bool
+	Grant   FullGrant
+	Account string // empty when the vendor named none
+	Status  int
+	Reason  string
+}
+
+// Vendor is the vendor as the manager reaches it; a test stubs it.
+type Vendor interface {
+	Refresh(ctx context.Context, g FullGrant) Refreshed
+	Usage(ctx context.Context, accessToken string) (map[string]any, error)
+}
+
+type tokenResponse struct {
+	AccessToken           string   `json:"access_token"`
+	RefreshToken          string   `json:"refresh_token"`
+	ExpiresIn             *int64   `json:"expires_in"`
+	RefreshTokenExpiresIn *int64   `json:"refresh_token_expires_in"`
+	Scope                 string   `json:"scope"`
+	Scopes                []string `json:"scopes"`
+	SubscriptionType      string   `json:"subscription_type"`
+	Account               *struct {
+		UUID string `json:"uuid"`
+	} `json:"account"`
+}
+
+// NextGrant is the grant a refresh answered, laid over the one refreshed: a refresh token the vendor did
+// not rotate is kept, so a rotating vendor and one that does not are both handled.
+func NextGrant(prev FullGrant, r tokenResponse, nowMs int64) Refreshed {
+	if r.AccessToken == "" {
+		return Refreshed{Status: 200, Reason: "the vendor answered without an access token"}
+	}
+	g := prev
+	g.AccessToken = r.AccessToken
+	if r.RefreshToken != "" {
+		g.RefreshToken = r.RefreshToken
+	}
+	if r.ExpiresIn != nil {
+		g.ExpiresAt = nowMs + *r.ExpiresIn*1000
+	}
+	if r.RefreshTokenExpiresIn != nil {
+		v := nowMs + *r.RefreshTokenExpiresIn*1000
+		g.RefreshTokenExpiresAt = &v
+	}
+	if len(r.Scopes) > 0 {
+		g.Scopes = r.Scopes
+	} else if r.Scope != "" {
+		g.Scopes = strings.Fields(r.Scope)
+	}
+	if r.SubscriptionType != "" {
+		g.SubscriptionType = r.SubscriptionType
+	}
+	out := Refreshed{OK: true, Grant: g}
+	if r.Account != nil {
+		out.Account = r.Account.UUID
+	}
+	return out
+}
+
+type liveVendor struct{ client *http.Client }
+
+// LiveVendor is the vendor over the network.
+func LiveVendor() Vendor { return liveVendor{client: &http.Client{Timeout: 30 * time.Second}} }
+
+func (v liveVendor) Refresh(ctx context.Context, g FullGrant) Refreshed {
+	form := url.Values{"grant_type": {"refresh_token"}, "refresh_token": {g.RefreshToken}, "client_id": {clientID}}
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, tokenEndpoint(), strings.NewReader(form.Encode()))
+	if err != nil {
+		return Refreshed{Reason: err.Error()}
+	}
+	req.Header.Set("content-type", "application/x-www-form-urlencoded")
+	resp, err := v.client.Do(req)
+	if err != nil {
+		return Refreshed{Reason: "the token endpoint did not answer: " + err.Error()}
+	}
+	defer resp.Body.Close()
+	body, _ := io.ReadAll(io.LimitReader(resp.Body, 1<<20))
+	if resp.StatusCode/100 != 2 {
+		// The body, never only the status: a malformed request and a revoked grant both answer 400.
+		reason := string(body)
+		if len(reason) > 400 {
+			reason = reason[:400]
+		}
+		return Refreshed{Status: resp.StatusCode, Reason: reason}
+	}
+	var r tokenResponse
+	if err := json.Unmarshal(body, &r); err != nil {
+		return Refreshed{Status: resp.StatusCode, Reason: "the vendor's answer is not JSON"}
+	}
+	return NextGrant(g, r, time.Now().UnixMilli())
+}
+
+func (v liveVendor) Usage(ctx context.Context, accessToken string) (map[string]any, error) {
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, usageEndpoint(), nil)
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Set("authorization", "Bearer "+accessToken)
+	resp, err := v.client.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode/100 != 2 {
+		return nil, fmt.Errorf("the usage endpoint answered %d", resp.StatusCode)
+	}
+	var out map[string]any
+	return out, json.NewDecoder(resp.Body).Decode(&out)
+}
+
+// UsageReading is the licence-grain reading (ADR 0054), flattened from the vendor's windows.
+type UsageReading struct {
+	SessionPct      *float64 `json:"sessionPct"`
+	SessionResetsAt string   `json:"sessionResetsAt,omitempty"`
+	WeeklyPct       *float64 `json:"weeklyPct"`
+	SonnetPct       *float64 `json:"sonnetPct"`
+}
+
+// FlattenUsage reads the windows the predecessor read.
+func FlattenUsage(u map[string]any) UsageReading {
+	window := func(k string) (*float64, string) {
+		w, ok := u[k].(map[string]any)
+		if !ok {
+			return nil, ""
+		}
+		pct, ok := w["utilization"].(float64)
+		resets, _ := w["resets_at"].(string)
+		if !ok {
+			return nil, resets
+		}
+		return &pct, resets
+	}
+	s, resets := window("five_hour")
+	w, _ := window("seven_day")
+	so, _ := window("seven_day_sonnet")
+	return UsageReading{SessionPct: s, SessionResetsAt: resets, WeeklyPct: w, SonnetPct: so}
+}

modules/claude-licence-manager/go.mod

@@ -0,0 +1,16 @@
+module claude-licence-manager
+
+go 1.25.0
+
+require (
+	git.novox.be/novox/mesh-sdk/go v0.1.7
+	github.com/jackc/pgx/v5 v5.11.0
+)
+
+require (
+	github.com/jackc/pgpassfile v1.0.0 // indirect
+	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
+	github.com/jackc/puddle/v2 v2.2.2 // indirect
+	golang.org/x/sync v0.17.0 // indirect
+	golang.org/x/text v0.29.0 // indirect
+)

modules/claude-licence-manager/go.sum

@@ -0,0 +1,28 @@
+git.novox.be/novox/mesh-sdk/go v0.1.7 h1:C0sTQmtTiyYH7bnqZb7PusXnqA37gKuT7Nqjn9gG47w=
+git.novox.be/novox/mesh-sdk/go v0.1.7/go.mod h1:GFuZUElBZ9A++mxgIKo97aXXo+kV0uJ/UkbhQPPIbrY=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/jackc/pgpassfile v1.0.0 h1:/6Hmqy13Ss2zCq62VdNG8tM1wchn8zjSGOBJ6icpsIM=
+github.com/jackc/pgpassfile v1.0.0/go.mod h1:CEx0iS5ambNFdcRtxPj5JhEz+xB6uRky5eyVu/W2HEg=
+github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 h1:iCEnooe7UlwOQYpKFhBabPMi4aNAfoODPEFNiAnClxo=
+github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761/go.mod h1:5TJZWKEWniPve33vlWYSoGYefn3gLQRzjfDlhSJ9ZKM=
+github.com/jackc/pgx/v5 v5.11.0 h1:IzBBtyK9AHqf98cctWFifYSci2hgQR/cd56wB4p+ogg=
+github.com/jackc/pgx/v5 v5.11.0/go.mod h1:mal1tBGAFfLHvZzaYh77YS/eC6IX9OWbRV1QIIM0Jn4=
+github.com/jackc/puddle/v2 v2.2.2 h1:PR8nw+E/1w0GLuRFSmiioY6UooMp6KJv0/61nB7icHo=
+github.com/jackc/puddle/v2 v2.2.2/go.mod h1:vriiEXHvEE654aYKXXjOvZM39qJ0q+azkZFrfEOc3H4=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
+github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
+github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
+golang.org/x/sync v0.17.0 h1:l60nONMj9l5drqw6jlhIELNv9I0A4OFgRsG9k2oT9Ug=
+golang.org/x/sync v0.17.0/go.mod h1:9KTHXmSnoGruLpwFjVSX0lNNA75CykiMECbovNTZqGI=
+golang.org/x/text v0.29.0 h1:1neNs90w9YzJ9BocxfsQNHKuAT4pkghyXc4nhZ6sJvk=
+golang.org/x/text v0.29.0/go.mod h1:7MhJOA9CD2qZyOKYazxdYMF85OwPdEr9jTtBpO7ydH4=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

modules/claude-licence-manager/module.json

@@ -0,0 +1,130 @@
+{
+  "module": "claude-licence-manager",
+  "version": "1",
+  "slug": "licmgr",
+  "requires": [
+    "postgres-database",
+    "secret"
+  ],
+  "contributes": {
+    "postgres-database": {
+      "name": "claude_licences"
+    }
+  },
+  "binds": {
+    "postgres-database": "${dir:state}/database.json"
+  },
+  "secrets": {
+    "postgres-database": "${dir:state}/database.secret",
+    "secret": {
+      "grant-key": "${dir:state}/grant.key"
+    }
+  },
+  "seats": [
+    {
+      "name": "anthropic-licence-manager",
+      "scope": "mesh",
+      "serves": [
+        "licences",
+        "bindings",
+        "bind",
+        "switch",
+        "release",
+        "refresh",
+        "usage",
+        "adopt",
+        "current"
+      ]
+    }
+  ],
+  "claims": [
+    {
+      "name": "anthropic-licence-manager",
+      "scope": "mesh",
+      "serves": [
+        "licences",
+        "bindings",
+        "bind",
+        "switch",
+        "release",
+        "refresh",
+        "usage",
+        "adopt",
+        "current"
+      ]
+    }
+  ],
+  "emits": [
+    "licence.adopted",
+    "licence.refused",
+    "licence.failing",
+    "usage.read"
+  ],
+  "state": [
+    "bindings"
+  ],
+  "reads": [
+    "claude-code.holdings"
+  ],
+  "resources": [
+    {
+      "id": "state",
+      "type": "directory",
+      "mode": "0700",
+      "place": "."
+    },
+    {
+      "id": "database-url",
+      "type": "file",
+      "path": "${dir:state}/database.url",
+      "mode": "0600",
+      "content": "postgresql://${bound:postgres-database:as}:${secret:postgres-database}@${bound:postgres-database:at}:${bound:postgres-database:port}/${bound:postgres-database:as}\n"
+    },
+    {
+      "id": "settings",
+      "type": "file",
+      "path": "${dir:state}/settings.json",
+      "mode": "0600",
+      "merge": "json",
+      "content": "{\n  \"cadence_minutes\": 240,\n  \"floor_minutes\": 60,\n  \"failures_to_notify\": 3,\n  \"cooldown_hours\": 24,\n  \"refresh_warn_days\": 3\n}\n"
+    },
+    {
+      "id": "prepare",
+      "type": "process",
+      "name": "claude-licence-manager-prepare",
+      "artifact": "code",
+      "run": [
+        "./claude-licence-manager",
+        "prepare"
+      ],
+      "run-once": true,
+      "env": {
+        "DATABASE_URL_FILE": "${dir:state}/database.url"
+      },
+      "restart-on": [
+        "database-url"
+      ]
+    }
+  ],
+  "build": {
+    "artifacts": [
+      {
+        "name": "code",
+        "kind": "bundle",
+        "language": "go",
+        "system": "arch",
+        "from": "cmd/claude-licence-manager",
+        "binary": "claude-licence-manager",
+        "loads": [
+          "claude-licence-manager"
+        ],
+        "env": {
+          "DATABASE_URL_FILE": "${dir:state}/database.url",
+          "MESH_LICENCE_STATE": "${dir:state}",
+          "MESH_LICENCE_KEY_FILE": "${dir:state}/grant.key",
+          "MESH_LICENCE_SETTINGS": "${dir:state}/settings.json"
+        }
+      }
+    ]
+  }
+}

modules/cloudflare-dns/Dockerfile

@@ -1,24 +0,0 @@
-# cloudflare-dns's runtime: the tool runtime, carrying this module's compiled code.
-#
-# **Built from this module's own directory and nothing else.** The sdk and the tool runtime are in
-# the base images, published like any other artifact — which is what makes this buildable by the
-# mesh from a repository and a path (novox/hq ADR 0069) rather than only on a workstation that
-# happens to have the siblings.
-#
-# Two bases, named rather than pinned (novox/hq issue 044): the image this is COMPILED in and the
-# image it RUNS in — the second must not carry a compiler. Declared in module.json's `build.on`.
-ARG BUILD_BASE
-ARG RUNTIME_BASE
-
-FROM ${BUILD_BASE} AS build
-WORKDIR /app/modules/cloudflare-dns
-COPY . .
-RUN node /app/node_modules/typescript/bin/tsc client.ts tools/index.ts provisioner/index.ts \
-      --module NodeNext --moduleResolution NodeNext --target ES2022 --outDir dist
-
-FROM ${RUNTIME_BASE}
-COPY --from=build /app/modules/cloudflare-dns/dist /app/modules/cloudflare-dns/dist
-# Every serve-time entrypoint, loaded by the runtime in serve mode: tools and events serve, and a
-# provider's provisioner runs its reconcile loop in the same process, with the broker connected —
-# the convention novox/hq issues 060/061 settled.
-ENV MESH_TOOL_MODULES=/app/modules/cloudflare-dns/dist/tools/index.js,/app/modules/cloudflare-dns/dist/provisioner/index.js

modules/cloudflare-dns/module.json

@@ -12,87 +12,61 @@
     "public-dns": {}
   },
   "grants": {
-    "public-dns": "/var/lib/cloudflare-dns/grants"
+    "public-dns": "${dir:grants}"
   },
   "receives": {
-    "public-dns": "/var/lib/cloudflare-dns/grants/mesh.json"
+    "public-dns": "${dir:grants}/mesh.json"
   },
   "own-secrets": {
-    "token": "/var/lib/cloudflare-dns/token",
+    "token": "${dir:state}/token"
-    "broker": "/var/lib/mesh/cloudflare-dns/broker"
   },
   "emits": [
     "record.created",
     "record.removed"
   ],
   "resources": [
-    {
-      "id": "mesh-state",
-      "type": "directory",
-      "path": "/var/lib/mesh/cloudflare-dns",
-      "mode": "0700"
-    },
     {
       "id": "state",
       "type": "directory",
-      "path": "/var/lib/cloudflare-dns",
+      "mode": "0700",
-      "mode": "0700"
+      "place": "."
     },
     {
       "id": "grants",
       "type": "directory",
-      "path": "/var/lib/cloudflare-dns/grants",
       "mode": "0700"
     },
     {
       "id": "config",
       "type": "file",
-      "path": "/var/lib/cloudflare-dns/config.json",
+      "path": "${dir:state}/config.json",
       "merge": "json",
       "content": "{}",
       "mode": "0600"
-    },
-    {
-      "id": "runtime",
-      "type": "container",
-      "name": "mesh-cloudflare-dns",
-      "network": "host",
-      "volumes": [
-        "/var/lib/cloudflare-dns/config.json:/run/config/config.json:ro",
-        "/var/lib/cloudflare-dns/grants:/grants",
-        "/var/lib/cloudflare-dns/token:/run/secrets/token:ro",
-        "/var/lib/mesh/cloudflare-dns/broker:/run/secrets/broker:ro"
-      ],
-      "env": {
-        "MESH_CLOUDFLARE_TOKEN_FILE": "/run/secrets/token",
-        "MESH_BROKER_FILE": "/run/secrets/broker",
-        "MESH_CLOUDFLARE_CONFIG_FILE": "/run/config/config.json",
-        "MESH_RECEIVES": "/var/lib/cloudflare-dns/grants/mesh.json"
-      },
-      "artifact": "runtime"
     }
   ],
   "capabilities": [
     "container-runtime"
   ],
   "build": {
-    "on": [
-      {
-        "arg": "BUILD_BASE",
-        "module": "mesh-tools",
-        "artifact": "build"
-      },
-      {
-        "arg": "RUNTIME_BASE",
-        "module": "mesh-tools",
-        "artifact": "runtime"
-      }
-    ],
     "artifacts": [
       {
-        "name": "runtime",
+        "name": "code",
-        "kind": "image",
+        "kind": "bundle",
-        "from": "Dockerfile"
+        "language": "typescript",
+        "entrypoints": [
+          "tools/index.js",
+          "provisioner/index.js"
+        ],
+        "loads": [
+          "tools/index.js",
+          "provisioner/index.js"
+        ],
+        "env": {
+          "MESH_CLOUDFLARE_TOKEN_FILE": "${dir:state}/token",
+          "MESH_CLOUDFLARE_CONFIG_FILE": "${dir:state}/config.json",
+          "MESH_RECEIVES": "${dir:grants}/mesh.json"
+        }
       }
     ]
   }

modules/confluence/Dockerfile

@@ -1,24 +0,0 @@
-# confluence's runtime: the tool runtime, carrying this module's compiled code.
-#
-# **Built from this module's own directory and nothing else.** The sdk and the tool runtime are in
-# the base images, published like any other artifact — which is what makes this buildable by the
-# mesh from a repository and a path (novox/hq ADR 0069) rather than only on a workstation that
-# happens to have the siblings.
-#
-# Two bases, named rather than pinned (novox/hq issue 044): the image this is COMPILED in and the
-# image it RUNS in — the second must not carry a compiler. Declared in module.json's `build.on`.
-ARG BUILD_BASE
-ARG RUNTIME_BASE
-
-FROM ${BUILD_BASE} AS build
-WORKDIR /app/modules/confluence
-COPY . .
-RUN node /app/node_modules/typescript/bin/tsc client.ts tools/index.ts \
-      --module NodeNext --moduleResolution NodeNext --target ES2022 --outDir dist
-
-FROM ${RUNTIME_BASE}
-COPY --from=build /app/modules/confluence/dist /app/modules/confluence/dist
-# Every serve-time entrypoint, loaded by the runtime in serve mode: tools and events serve, and a
-# provider's provisioner runs its reconcile loop in the same process, with the broker connected —
-# the convention novox/hq issues 060/061 settled.
-ENV MESH_TOOL_MODULES=/app/modules/confluence/dist/tools/index.js

modules/confluence/module.json

@@ -3,69 +3,43 @@
   "version": "1",
   "slug": "confl",
   "own-secrets": {
-    "token": "/var/lib/confluence/token",
+    "token": "${dir:state}/token"
-    "broker": "/var/lib/mesh/confluence/broker"
   },
   "resources": [
-    {
-      "id": "mesh-state",
-      "type": "directory",
-      "path": "/var/lib/mesh/confluence",
-      "mode": "0700"
-    },
     {
       "id": "state",
       "type": "directory",
-      "path": "/var/lib/confluence",
+      "mode": "0700",
-      "mode": "0700"
+      "place": "."
     },
     {
       "id": "config",
       "type": "file",
-      "path": "/var/lib/confluence/config.json",
+      "path": "${dir:state}/config.json",
       "merge": "json",
       "content": "{}",
       "mode": "0600"
-    },
-    {
-      "id": "runtime",
-      "type": "container",
-      "name": "mesh-runtime-confluence",
-      "network": "host",
-      "volumes": [
-        "/var/lib/confluence/config.json:/run/config/config.json:ro",
-        "/var/lib/confluence/token:/run/secrets/token:ro",
-        "/var/lib/mesh/confluence/broker:/run/secrets/broker:ro"
-      ],
-      "env": {
-        "MESH_CONFLUENCE_TOKEN_FILE": "/run/secrets/token",
-        "MESH_CONFLUENCE_CONFIG_FILE": "/run/config/config.json",
-        "MESH_BROKER_FILE": "/run/secrets/broker"
-      },
-      "artifact": "runtime"
     }
   ],
   "capabilities": [
     "container-runtime"
   ],
   "build": {
-    "on": [
-      {
-        "arg": "BUILD_BASE",
-        "module": "mesh-tools",
-        "artifact": "build"
-      },
-      {
-        "arg": "RUNTIME_BASE",
-        "module": "mesh-tools",
-        "artifact": "runtime"
-      }
-    ],
     "artifacts": [
       {
-        "name": "runtime",
+        "name": "tools",
-        "kind": "image",
+        "kind": "bundle",
-        "from": "Dockerfile"
+        "language": "typescript",
+        "entrypoints": [
+          "tools/index.js"
+        ],
+        "loads": [
+          "tools/index.js"
+        ],
+        "env": {
+          "MESH_CONFLUENCE_TOKEN_FILE": "${dir:state}/token",
+          "MESH_CONFLUENCE_CONFIG_FILE": "${dir:state}/config.json"
+        }
       }
     ]
   }

modules/cups/README.md

@@ -0,0 +1,84 @@
+# cups
+
+Printing on the two workstations (novox/hq research 027/02: "`cups` with the printer's driver"; to-be 42
+phase 2 step 9).
+
+## Owns
+
+| what | where |
+|---|---|
+| the print scheduler | package `cups` |
+| driverless printing: the filters that turn a document into what an IPP Everywhere printer takes | package `cups-filters` |
+| the scheduler, started on demand and at boot | `cups.socket` and `cups.service`, running and enabled |
+
+All from the official repositories. The queues (`/etc/cups/printers.conf`, the PPDs CUPS generates)
+and the default printer are CUPS's own state, set through its tools. They are found (ADR 0182), and
+the module declares none of them.
+
+## The printer's driver: none needed for the Brother
+
+Research 027 asked for "`cups` with the printer's driver". Measured on 2026-10-04:
+
+| workstation | queue | device | prints through | driver package installed |
+|---|---|---|---|---|
+| laptop | `Brother` (MFC-L8690CDW) | `ipp://` on the LAN | **IPP Everywhere, driverless** | `brother-mfc-l8690cdw` (AUR), unused |
+| desktop | `Brother_MFC_Novox` (default) | `ipp://` on the LAN | **IPP Everywhere, driverless** | `brother-mfc-l8390cdw` and its `-debug` (AUR), unused |
+| desktop | `Kanjuro` (Canon PIXMA MG4200) | `cnijnet:` | the vendor's PPD and filter | `cnijfilter-mg4200` 3.80 (AUR) |
+
+**Both Brother queues already print without a vendor driver.** CUPS's own IPP Everywhere support,
+with `cups-filters`, is the whole driver. The vendor packages installed beside them serve no queue,
+and the laptop's pulls in 32-bit glibc from multilib for a filter nothing runs. So the module declares
+no driver, and the Brother needs nothing outside the official repositories.
+
+**The Canon is the exception, and it is blocked.** Its driver is a user-repository package from 2012,
+with its own network backend. Like snapd, it waits for the mesh's package repository (research 027
+question 1, option P2). Until then it stays as found on the desktop. If the printer answers IPP (check
+with `cups_drivers` on a fresh queue, or `driverless` from `cups-filters`), a driverless queue replaces
+it and the question goes away.
+
+## Improves
+
+- **An owner for the scheduler.** It runs on both workstations today, enabled by nothing the mesh records.
+- **No driver package that nothing uses.** The README's one-off step below removes them, once.
+- **Supplies and state from anywhere.** `cups_printers` answers each queue's toner levels and flags a
+  low one. It also answers why a queue stopped, without opening the printer's page.
+- **The laptop has no default printer**, so a print without a named printer fails there.
+  `cups_default` sets one; it is the operator's choice, not declared.
+
+## Tools
+
+All answer JSON; `(r)` reads, `(a)` acts. They run as the operator account. CUPS lets any account
+print and cancel its own jobs. Setting the default, resuming a printer, and cancelling another
+account's job are kept for its administrators, so those go through `sudo -n`; a cancel tries the
+account first.
+
+| tool | what |
+|---|---|
+| `cups_printers` (r) | every queue: state, enabled, accepting, default, device, make and model, driverless or not, state reasons, supply levels (low flagged) |
+| `cups_queue` (r) | jobs waiting or printing, or the completed ones, newest first, bounded |
+| `cups_cancel` (a) | one job, or every job on a printer |
+| `cups_print` (a) | a file on this machine to a printer or the default, with copies and IPP options; answers the job id |
+| `cups_default` (r/a) | read the default, or set it |
+| `cups_resume` (a) | enable a stopped printer and make it accept jobs |
+| `cups_drivers` (r) | how each queue prints, the packages that bring filters and backends (foreign ones flagged), findings, and the driver models CUPS offers, filtered |
+
+## What changes when it is assigned
+
+Nothing on disk on either workstation: both have `cups` (explicit) and `cups-filters` (as its
+dependency), with `cups.socket` and `cups.service` enabled and running. The packages become the
+mesh's; `cups-filters` is now declared explicitly.
+
+## The one-off step for the operator (ADR 0182)
+
+The mesh removes nothing it did not install. Once the Brother queues are confirmed printing (they do
+today), remove the unused vendor drivers, once:
+
+- **laptop:** `brother-mfc-l8690cdw`, then whatever `pacman -Qdtq` shows it alone pulled in
+  (`lib32-glibc`).
+- **desktop:** `brother-mfc-l8390cdw` and `brother-mfc-l8390cdw-debug`. Keep `cnijfilter-mg4200` while
+  the Canon queue is used.
+
+## Leaves as found
+
+The queues and their PPDs, the default printer, `cups.path` (enabled by the package's preset),
+`system-config-printer` on the desktop, and `cnijfilter-mg4200`.

modules/cups/cmd/cups-tools/cups.go

@@ -0,0 +1,560 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"regexp"
+	"sort"
+	"strconv"
+	"strings"
+)
+
+var queueName = regexp.MustCompile(`^[A-Za-z0-9_.@-]{1,127}$`)
+
+func checkPrinter(p string) error {
+	if !queueName.MatchString(p) || strings.HasPrefix(p, "-") {
+		return fmt.Errorf("%q is not a printer queue's name", p)
+	}
+	return nil
+}
+
+var optionName = regexp.MustCompile(`^[a-z][a-z0-9-]{0,63}$`)
+var optionValue = regexp.MustCompile(`^[A-Za-z0-9._:-]{1,128}$`)
+
+// optionsOf reads the print options object.
+func optionsOf(args map[string]any) (map[string]string, error) {
+	v, ok := args["options"]
+	if !ok || v == nil {
+		return nil, nil
+	}
+	m, ok := v.(map[string]any)
+	if !ok {
+		return nil, fmt.Errorf("options must be an object of names to values")
+	}
+	out := map[string]string{}
+	for k, val := range m {
+		s, ok := val.(string)
+		if !ok || !optionName.MatchString(k) || !optionValue.MatchString(s) {
+			return nil, fmt.Errorf("option %s=%v is not an IPP option name and a plain value", k, val)
+		}
+		out[k] = s
+	}
+	return out, nil
+}
+
+// lpoptionsOf reads lpoptions' answer: name=value pairs, a value quoted with ' or with backslash escapes.
+func lpoptionsOf(s string) map[string]string {
+	out := map[string]string{}
+	s = strings.TrimSpace(s)
+	i := 0
+	for i < len(s) {
+		for i < len(s) && s[i] == ' ' {
+			i++
+		}
+		start := i
+		for i < len(s) && s[i] != '=' && s[i] != ' ' {
+			i++
+		}
+		key := s[start:i]
+		if i >= len(s) || s[i] != '=' {
+			if key != "" {
+				out[key] = ""
+			}
+			continue
+		}
+		i++
+		var b strings.Builder
+		for i < len(s) && s[i] != ' ' {
+			switch s[i] {
+			case '\'':
+				i++
+				for i < len(s) && s[i] != '\'' {
+					if s[i] == '\\' && i+1 < len(s) {
+						i++
+					}
+					b.WriteByte(s[i])
+					i++
+				}
+				i++
+			case '\\':
+				if i+1 < len(s) {
+					b.WriteByte(s[i+1])
+				}
+				i += 2
+			default:
+				b.WriteByte(s[i])
+				i++
+			}
+		}
+		out[key] = b.String()
+	}
+	return out
+}
+
+// Marker is one supply the printer reports.
+type Marker struct {
+	Name  string `json:"name"`
+	Type  string `json:"type,omitempty"`
+	Level int    `json:"level_percent"`
+	Low   bool   `json:"low"`
+}
+
+// Printer is one queue.
+type Printer struct {
+	Name       string   `json:"name"`
+	State      string   `json:"state"`
+	Enabled    bool     `json:"enabled"`
+	Accepting  bool     `json:"accepting"`
+	Default    bool     `json:"default"`
+	URI        string   `json:"uri"`
+	MakeModel  string   `json:"make_and_model"`
+	Driverless bool     `json:"driverless"`
+	Shared     bool     `json:"shared"`
+	Reasons    []string `json:"reasons"`
+	Markers    []Marker `json:"markers"`
+	Since      string   `json:"since,omitempty"`
+	Message    string   `json:"message,omitempty"`
+}
+
+// PrintersAnswer is what cups_printers answers.
+type PrintersAnswer struct {
+	Scheduler string    `json:"scheduler"`
+	Default   string    `json:"default,omitempty"`
+	Printers  []Printer `json:"printers"`
+}
+
+func lpstat(args ...string) (string, error) {
+	r, err := call(Cmd{Name: "lpstat", Args: args})
+	if err != nil {
+		if strings.Contains(r.Stderr, "Scheduler is not running") || strings.Contains(r.Stderr, "Connection refused") {
+			return "", fmt.Errorf("the print scheduler is not running on this machine: %s", firstLine(r.Stderr))
+		}
+		// lpstat answers "No destinations added." with a non-zero status: that is no printers.
+		if strings.Contains(r.Stderr, "No destinations added") {
+			return "", nil
+		}
+		return "", err
+	}
+	return r.Stdout, nil
+}
+
+func defaultPrinter() (string, error) {
+	out, err := lpstat("-d")
+	if err != nil {
+		return "", err
+	}
+	if _, after, ok := strings.Cut(out, "system default destination: "); ok {
+		return strings.TrimSpace(firstLine(after)), nil
+	}
+	return "", nil
+}
+
+// Printers answers every queue with its state, device, model and supplies.
+func Printers() (PrintersAnswer, error) {
+	out := PrintersAnswer{Printers: []Printer{}}
+	sched, err := lpstat("-r")
+	if err != nil {
+		return out, err
+	}
+	out.Scheduler = strings.TrimSpace(sched)
+	if out.Default, err = defaultPrinter(); err != nil {
+		return out, err
+	}
+	ps, err := lpstat("-p")
+	if err != nil {
+		return out, err
+	}
+	var cur *Printer
+	for _, l := range strings.Split(ps, "\n") {
+		if strings.HasPrefix(l, "printer ") {
+			f := strings.Fields(l)
+			if len(f) < 3 {
+				continue
+			}
+			out.Printers = append(out.Printers, Printer{Name: f[1], Reasons: []string{}, Markers: []Marker{}})
+			cur = &out.Printers[len(out.Printers)-1]
+			rest := strings.Join(f[2:], " ")
+			switch {
+			case strings.HasPrefix(rest, "is idle"):
+				cur.State = "idle"
+			case strings.HasPrefix(rest, "now printing"):
+				cur.State = "printing"
+			default:
+				cur.State = "stopped"
+			}
+			// "disabled since …" (stopped), or "enabled since …" after the state.
+			cur.Enabled = !strings.HasPrefix(rest, "disabled") && !strings.Contains(rest, "disabled since")
+			if _, since, found := strings.Cut(rest, " since "); found {
+				cur.Since = strings.TrimSuffix(strings.TrimSpace(since), " -")
+			}
+			continue
+		}
+		if cur != nil && strings.HasPrefix(l, "\t") && strings.TrimSpace(l) != "" {
+			cur.Message = strings.TrimSpace(cur.Message + " " + strings.TrimSpace(l))
+		}
+	}
+	acc, err := lpstat("-a")
+	if err != nil {
+		return out, err
+	}
+	accepting := map[string]bool{}
+	for _, l := range lines(acc) {
+		if f := strings.Fields(l); len(f) >= 2 && f[1] == "accepting" {
+			accepting[f[0]] = true
+		}
+	}
+	for i := range out.Printers {
+		p := &out.Printers[i]
+		p.Accepting = accepting[p.Name]
+		p.Default = p.Name == out.Default
+		r, err := call(Cmd{Name: "lpoptions", Args: []string{"-p", p.Name}})
+		if err != nil {
+			return out, err
+		}
+		o := lpoptionsOf(r.Stdout)
+		p.URI = o["device-uri"]
+		p.MakeModel = o["printer-make-and-model"]
+		p.Driverless = driverless(p.MakeModel, p.URI)
+		p.Shared = o["printer-is-shared"] == "true"
+		for _, reason := range strings.Split(o["printer-state-reasons"], ",") {
+			if reason = strings.TrimSpace(reason); reason != "" && reason != "none" {
+				p.Reasons = append(p.Reasons, reason)
+			}
+		}
+		p.Markers = markersOf(o)
+	}
+	return out, nil
+}
+
+// driverless says a queue prints without a vendor driver: CUPS's own IPP Everywhere model, or a
+// driverless URI.
+func driverless(model, uri string) bool {
+	m := strings.ToLower(model)
+	return strings.Contains(m, "ipp everywhere") || strings.Contains(m, "driverless") || strings.HasPrefix(uri, "implicitclass:") ||
+		strings.HasPrefix(uri, "ipp://") && strings.Contains(m, "everywhere")
+}
+
+func markersOf(o map[string]string) []Marker {
+	split := func(k string) []string {
+		if o[k] == "" {
+			return nil
+		}
+		return strings.Split(o[k], ",")
+	}
+	names, levels, lows, types := split("marker-names"), split("marker-levels"), split("marker-low-levels"), split("marker-types")
+	out := []Marker{}
+	for i, n := range names {
+		if i >= len(levels) {
+			break
+		}
+		level, err := strconv.Atoi(strings.TrimSpace(levels[i]))
+		if err != nil {
+			continue
+		}
+		m := Marker{Name: strings.TrimSpace(n), Level: level}
+		if i < len(types) {
+			m.Type = strings.TrimSpace(types[i])
+		}
+		if i < len(lows) {
+			if low, err := strconv.Atoi(strings.TrimSpace(lows[i])); err == nil && level >= 0 && level <= low {
+				m.Low = true
+			}
+		}
+		out = append(out, m)
+	}
+	return out
+}
+
+// Job is one print job.
+type Job struct {
+	ID        string `json:"id"`
+	Printer   string `json:"printer"`
+	User      string `json:"user"`
+	Bytes     int64  `json:"bytes"`
+	Submitted string `json:"submitted"`
+}
+
+// Queue answers the jobs waiting, or the finished ones.
+func Queue(printer string, completed bool, limit int) (map[string]any, error) {
+	args := []string{}
+	if completed {
+		args = append(args, "-W", "completed")
+	}
+	args = append(args, "-o")
+	if printer != "" {
+		if err := checkPrinter(printer); err != nil {
+			return nil, err
+		}
+		args = append(args, printer)
+	}
+	out, err := lpstat(args...)
+	if err != nil {
+		return nil, err
+	}
+	jobs := []Job{}
+	for _, l := range lines(out) {
+		f := strings.Fields(l)
+		if len(f) < 4 {
+			continue
+		}
+		i := strings.LastIndex(f[0], "-")
+		if i <= 0 {
+			continue
+		}
+		size, _ := strconv.ParseInt(f[2], 10, 64)
+		jobs = append(jobs, Job{ID: f[0], Printer: f[0][:i], User: f[1], Bytes: size, Submitted: strings.Join(f[3:], " ")})
+	}
+	sort.SliceStable(jobs, func(a, b int) bool { return jobNumber(jobs[a].ID) > jobNumber(jobs[b].ID) })
+	total := len(jobs)
+	if len(jobs) > limit {
+		jobs = jobs[:limit]
+	}
+	return map[string]any{"count": total, "jobs": jobs, "completed": completed}, nil
+}
+
+func jobNumber(id string) int {
+	n, _ := strconv.Atoi(id[strings.LastIndex(id, "-")+1:])
+	return n
+}
+
+var jobID = regexp.MustCompile(`^([A-Za-z0-9_.@-]+-)?[0-9]+$`)
+
+// refused says CUPS kept an act for its administrators.
+func refused(r Result) bool {
+	s := r.Stderr + r.Stdout
+	return strings.Contains(s, "Forbidden") || strings.Contains(s, "not-authorized") || strings.Contains(s, "Not authorized") || strings.Contains(s, "not allowed")
+}
+
+// asAccountThenRoot runs an act as the account, and through sudo -n when CUPS refuses the account.
+func asAccountThenRoot(c Cmd) (Result, bool, error) {
+	r := run(c)
+	if r.Status == 0 && r.Error == "" {
+		return r, false, nil
+	}
+	if !refused(r) {
+		return r, false, failure(c, r)
+	}
+	c.Root = true
+	r, err := call(c)
+	return r, true, err
+}
+
+// Cancel cancels one job, or every job on a printer.
+func Cancel(job, printer string, all bool) (map[string]any, error) {
+	var c Cmd
+	switch {
+	case all:
+		if printer == "" {
+			return nil, fmt.Errorf("all needs printer: cancelling every job on every printer is not offered")
+		}
+		if err := checkPrinter(printer); err != nil {
+			return nil, err
+		}
+		c = Cmd{Name: "cancel", Args: []string{"-a", printer}}
+	case job != "":
+		if !jobID.MatchString(job) {
+			return nil, fmt.Errorf("%q is not a job id", job)
+		}
+		c = Cmd{Name: "cancel", Args: []string{job}}
+	default:
+		return nil, fmt.Errorf("give job, or printer with all")
+	}
+	_, escalated, err := asAccountThenRoot(c)
+	if err != nil {
+		return nil, err
+	}
+	return map[string]any{"cancelled": strings.Join(c.Args, " "), "as_root": escalated}, nil
+}
+
+var requestID = regexp.MustCompile(`request id is (\S+)`)
+
+// statFile tells a regular file. Tests replace it.
+var statFile = func(p string) error {
+	info, err := os.Stat(p)
+	if err != nil {
+		return err
+	}
+	if !info.Mode().IsRegular() {
+		return fmt.Errorf("%s is not a regular file", p)
+	}
+	return nil
+}
+
+// Print sends a file to a printer.
+func Print(file, printer string, copies int, opts map[string]string, title string) (map[string]any, error) {
+	if !filepath.IsAbs(file) {
+		return nil, fmt.Errorf("file must be an absolute path, not %q", file)
+	}
+	if err := statFile(file); err != nil {
+		return nil, fmt.Errorf("cannot print %s: %v", file, err)
+	}
+	args := []string{}
+	if printer != "" {
+		if err := checkPrinter(printer); err != nil {
+			return nil, err
+		}
+		args = append(args, "-d", printer)
+	}
+	args = append(args, "-n", strconv.Itoa(copies))
+	names := make([]string, 0, len(opts))
+	for k := range opts {
+		names = append(names, k)
+	}
+	sort.Strings(names)
+	for _, k := range names {
+		args = append(args, "-o", k+"="+opts[k])
+	}
+	if title == "" {
+		title = filepath.Base(file)
+	}
+	args = append(args, "-t", title, "--", file)
+	r, err := call(Cmd{Name: "lp", Args: args})
+	if err != nil {
+		if strings.Contains(r.Stderr, "No default destination") {
+			return nil, fmt.Errorf("no printer given and this machine has no default printer: name one, or set one with cups_default")
+		}
+		return nil, err
+	}
+	m := requestID.FindStringSubmatch(r.Stdout)
+	if m == nil {
+		return nil, fmt.Errorf("lp answered no job id: %s", strings.TrimSpace(r.Stdout+r.Stderr))
+	}
+	return map[string]any{"job": m[1], "file": file, "copies": copies, "follow": "cups_queue"}, nil
+}
+
+// Default answers the default printer, or sets it.
+func Default(printer string) (map[string]any, error) {
+	if printer == "" {
+		d, err := defaultPrinter()
+		if err != nil {
+			return nil, err
+		}
+		return map[string]any{"default": d}, nil
+	}
+	if err := checkPrinter(printer); err != nil {
+		return nil, err
+	}
+	was, err := defaultPrinter()
+	if err != nil {
+		return nil, err
+	}
+	if _, err := call(Cmd{Name: "lpadmin", Args: []string{"-d", printer}, Root: true}); err != nil {
+		return nil, err
+	}
+	return map[string]any{"default": printer, "was": was}, nil
+}
+
+// Resume enables a printer and makes it accept jobs.
+func Resume(printer string) (map[string]any, error) {
+	if err := checkPrinter(printer); err != nil {
+		return nil, err
+	}
+	for _, c := range []string{"cupsenable", "cupsaccept"} {
+		if _, err := call(Cmd{Name: c, Args: []string{printer}, Root: true}); err != nil {
+			return nil, err
+		}
+	}
+	return map[string]any{"printer": printer, "enabled": true, "accepting": true}, nil
+}
+
+// DriverPackage is a package that brings filters or backends.
+type DriverPackage struct {
+	Package string `json:"package"`
+	Version string `json:"version"`
+	Foreign bool   `json:"foreign"`
+}
+
+// Model is one driver model CUPS offers.
+type Model struct {
+	PPD         string `json:"ppd"`
+	Description string `json:"description"`
+}
+
+// QueueDriver is how one queue prints.
+type QueueDriver struct {
+	Printer    string `json:"printer"`
+	MakeModel  string `json:"make_and_model"`
+	Driverless bool   `json:"driverless"`
+	URI        string `json:"uri"`
+}
+
+// DriversAnswer is what cups_drivers answers.
+type DriversAnswer struct {
+	Queues   []QueueDriver   `json:"queues"`
+	Packages []DriverPackage `json:"driver_packages"`
+	Models   []Model         `json:"models"`
+	Matched  int             `json:"models_matched"`
+	Findings []string        `json:"findings"`
+}
+
+// driverDirs are where drivers put what CUPS runs.
+var driverDirs = []string{"/usr/lib/cups/filter", "/usr/lib/cups/backend"}
+
+// basePackages bring CUPS's own filters and backends, not a printer's driver.
+var basePackages = map[string]bool{"cups": true, "cups-filters": true, "libcups": true, "ghostscript": true, "cups-pdf": false}
+
+// Drivers answers how each queue prints and which packages bring drivers.
+func Drivers(match string, limit int) (DriversAnswer, error) {
+	out := DriversAnswer{Queues: []QueueDriver{}, Packages: []DriverPackage{}, Models: []Model{}, Findings: []string{}}
+	ps, err := Printers()
+	if err != nil {
+		return out, err
+	}
+	for _, p := range ps.Printers {
+		out.Queues = append(out.Queues, QueueDriver{Printer: p.Name, MakeModel: p.MakeModel, Driverless: p.Driverless, URI: p.URI})
+	}
+	r := run(Cmd{Name: "pacman", Args: append([]string{"-Qo"}, driverDirs...)})
+	if r.Error != "" {
+		return out, failure(Cmd{Name: "pacman", Args: []string{"-Qo"}}, r)
+	}
+	seen := map[string]bool{}
+	for _, l := range lines(r.Stdout) {
+		if _, after, ok := strings.Cut(l, " is owned by "); ok {
+			f := strings.Fields(after)
+			if len(f) >= 2 && !seen[f[0]] && !basePackages[f[0]] {
+				seen[f[0]] = true
+				out.Packages = append(out.Packages, DriverPackage{Package: f[0], Version: f[1]})
+			}
+		}
+	}
+	if len(out.Packages) > 0 {
+		r := run(Cmd{Name: "pacman", Args: []string{"-Qqm"}})
+		foreign := map[string]bool{}
+		for _, l := range lines(r.Stdout) {
+			foreign[strings.TrimSpace(l)] = true
+		}
+		for i := range out.Packages {
+			out.Packages[i].Foreign = foreign[out.Packages[i].Package]
+		}
+	}
+	sort.Slice(out.Packages, func(i, k int) bool { return out.Packages[i].Package < out.Packages[k].Package })
+	m, err := call(Cmd{Name: "lpinfo", Args: []string{"-m"}})
+	if err != nil {
+		return out, err
+	}
+	for _, l := range lines(m.Stdout) {
+		ppd, desc, _ := strings.Cut(l, " ")
+		if match != "" && !strings.Contains(strings.ToLower(desc), strings.ToLower(match)) && !strings.Contains(strings.ToLower(ppd), strings.ToLower(match)) {
+			continue
+		}
+		out.Matched++
+		if len(out.Models) < limit {
+			out.Models = append(out.Models, Model{PPD: ppd, Description: desc})
+		}
+	}
+	// Which driver packages no queue prints through.
+	allDriverless := len(out.Queues) > 0
+	for _, q := range out.Queues {
+		allDriverless = allDriverless && q.Driverless
+	}
+	for _, p := range out.Packages {
+		if p.Foreign {
+			out.Findings = append(out.Findings, "driver package "+p.Package+" is not from the official repositories")
+		}
+		if allDriverless {
+			out.Findings = append(out.Findings, "every queue prints driverless, so no queue uses the driver package "+p.Package)
+		}
+	}
+	return out, nil
+}

modules/cups/cmd/cups-tools/cups_test.go

@@ -0,0 +1,234 @@
+package main
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestTheManifestIsTheSchedulerAndDriverlessPrintingAndNoVendorDriver(t *testing.T) {
+	m := readManifest(t)
+	holdsTheBundle(t, m, "cups")
+	if got := strings.Join(m.packages(), ","); got != "cups,cups-filters" {
+		t.Errorf("packages %s: a vendor driver is from outside the official repositories, and no queue measured needs one but the desktop's Canon", got)
+	}
+	s := m.services()
+	for _, u := range []string{"cups.socket", "cups.service"} {
+		if s[u] == nil || s[u]["state"] != "running" || s[u]["boot"] != "enabled" {
+			t.Errorf("%s: %v", u, s[u])
+		}
+	}
+	for _, r := range m.Resources {
+		if r["type"] == "file" {
+			t.Errorf("the queues and cupsd's files are CUPS's own: %v", r["id"])
+		}
+	}
+}
+
+// The desktop's two queues on 2026-10-04.
+func theDesktop(t *testing.T, more func(line string, c Cmd) (Result, bool)) *fake {
+	return using(t, func(line string, c Cmd) Result {
+		if more != nil {
+			if r, handled := more(line, c); handled {
+				return r
+			}
+		}
+		switch line {
+		case "lpstat -r":
+			return ok("scheduler is running\n")
+		case "lpstat -d":
+			return ok("system default destination: Brother_MFC_Novox\n")
+		case "lpstat -p":
+			return ok("printer Brother_MFC_Novox is idle.  enabled since Mon Jun 29 21:34:30 2026\n" +
+				"printer Kanjuro disabled since Sun Jun  9 11:16:03 2024 -\n\tPaused\n")
+		case "lpstat -a":
+			return ok("Brother_MFC_Novox accepting requests since Mon Jun 29 21:34:30 2026\nKanjuro not accepting requests since Sun Jun  9 11:16:03 2024 -\n\tRejecting Jobs\n")
+		case "lpoptions -p Brother_MFC_Novox":
+			return ok(`copies=1 device-uri=ipp://192.0.2.171/ipp/port1 finishings=3 marker-levels=70,100,8,100 marker-low-levels=10,10,10,10 marker-names='Black\ Toner\ Cartridge,Cyan\ Toner\ Cartridge,Magenta\ Toner\ Cartridge,Yellow\ Toner\ Cartridge' marker-types=toner,toner,toner,toner printer-is-shared=false printer-make-and-model='Printer - IPP Everywhere' printer-state-reasons=none`)
+		case "lpoptions -p Kanjuro":
+			return ok(`device-uri=cnijnet:/18-0C-AC-B0-62-83 printer-is-shared=false printer-make-and-model='Canon MG4200 series Ver.3.80' printer-state-reasons=paused`)
+		}
+		return Result{Status: 9, Stderr: "unexpected " + line}
+	})
+}
+
+func TestPrintersReadsStateDeviceModelAndSupplies(t *testing.T) {
+	theDesktop(t, nil)
+	got, err := Printers()
+	if err != nil || len(got.Printers) != 2 || got.Default != "Brother_MFC_Novox" || got.Scheduler != "scheduler is running" {
+		t.Fatalf("%+v %v", got, err)
+	}
+	b, k := got.Printers[0], got.Printers[1]
+	if b.State != "idle" || !b.Enabled || !b.Accepting || !b.Default || !b.Driverless || b.URI != "ipp://192.0.2.171/ipp/port1" || len(b.Reasons) != 0 {
+		t.Errorf("%+v", b)
+	}
+	if len(b.Markers) != 4 || b.Markers[0].Name != "Black Toner Cartridge" || b.Markers[2].Level != 8 || !b.Markers[2].Low || b.Markers[0].Low {
+		t.Errorf("markers %+v", b.Markers)
+	}
+	if k.State != "stopped" || k.Enabled || k.Accepting || k.Driverless || strings.Join(k.Reasons, ",") != "paused" || k.Message != "Paused" {
+		t.Errorf("%+v", k)
+	}
+}
+
+func TestPrintersWithoutAQueueOrAScheduler(t *testing.T) {
+	using(t, func(line string, c Cmd) Result {
+		if line == "lpstat -r" {
+			return ok("scheduler is running\n")
+		}
+		return Result{Status: 1, Stderr: "lpstat: No destinations added.\n"}
+	})
+	got, err := Printers()
+	if err != nil || len(got.Printers) != 0 {
+		t.Fatalf("no queue is an empty answer, not a failure: %+v %v", got, err)
+	}
+	using(t, func(string, Cmd) Result { return Result{Status: 1, Stderr: "lpstat: Scheduler is not running.\n"} })
+	if _, err := Printers(); err == nil || !strings.Contains(err.Error(), "scheduler is not running") {
+		t.Fatalf("%v", err)
+	}
+}
+
+func TestLpoptionsQuotingIsRead(t *testing.T) {
+	o := lpoptionsOf(`a=1 b='x y' c=p\ q d e=`)
+	if o["a"] != "1" || o["b"] != "x y" || o["c"] != "p q" || o["d"] != "" || o["e"] != "" {
+		t.Errorf("%v", o)
+	}
+}
+
+func TestQueueReadsJobsNewestFirstAndBounded(t *testing.T) {
+	f := using(t, func(string, Cmd) Result {
+		return ok("Brother-6               jochen            1024   Mon Jul  8 12:15:34 2024\nBrother-8               jochen            2048   Mon Jul  8 12:19:56 2024\nBrother-7               other             1024   Mon Jul  8 12:15:23 2024\n")
+	})
+	got, err := Queue("Brother", true, 2)
+	jobs := got["jobs"].([]Job)
+	if err != nil || got["count"] != 3 || len(jobs) != 2 || jobs[0].ID != "Brother-8" || jobs[0].Printer != "Brother" || jobs[0].Bytes != 2048 || jobs[0].Submitted != "Mon Jul 8 12:19:56 2024" {
+		t.Fatalf("%+v %v", got, err)
+	}
+	if f.lines()[0] != "lpstat -W completed -o Brother" {
+		t.Errorf("%v", f.lines())
+	}
+	if _, err := Queue("-h", false, 5); err == nil {
+		t.Error("an option as a printer")
+	}
+}
+
+func TestCancelTriesTheAccountThenRootWhenCUPSRefusesIt(t *testing.T) {
+	f := using(t, func(line string, c Cmd) Result {
+		if !strings.HasPrefix(line, "sudo") {
+			return Result{Status: 1, Stderr: "cancel: Forbidden\n"}
+		}
+		return ok("")
+	})
+	got, err := Cancel("Brother-12", "", false)
+	if err != nil || got["as_root"] != true {
+		t.Fatalf("%v %v", got, err)
+	}
+	if strings.Join(f.lines(), "|") != "cancel Brother-12|sudo -n cancel Brother-12" {
+		t.Errorf("%v", f.lines())
+	}
+	f = using(t, func(string, Cmd) Result { return ok("") })
+	if got, err := Cancel("", "Brother", true); err != nil || got["as_root"] != false || f.lines()[0] != "cancel -a Brother" {
+		t.Fatalf("%v %v %v", got, err, f.lines())
+	}
+	using(t, func(string, Cmd) Result { return Result{Status: 1, Stderr: "cancel: Unknown job 99\n"} })
+	if _, err := Cancel("99", "", false); err == nil || !strings.Contains(err.Error(), "Unknown job") {
+		t.Errorf("a failure that is not a refusal is not retried as root: %v", err)
+	}
+	for _, bad := range [][3]string{{"", "", ""}, {"12; rm", "", ""}, {"", "", "all"}} {
+		if _, err := Cancel(bad[0], bad[1], bad[2] == "all"); err == nil {
+			t.Errorf("%v accepted", bad)
+		}
+	}
+}
+
+func TestPrintChecksTheFileAndOptionsAndAnswersTheJob(t *testing.T) {
+	was := statFile
+	defer func() { statFile = was }()
+	statFile = func(p string) error {
+		if p == "/home/op/doc.pdf" {
+			return nil
+		}
+		return errString("no such file")
+	}
+	f := using(t, func(string, Cmd) Result { return ok("request id is Brother-13 (1 file(s))\n") })
+	got, err := Print("/home/op/doc.pdf", "Brother", 2, map[string]string{"sides": "two-sided-long-edge", "media": "A4"}, "")
+	if err != nil || got["job"] != "Brother-13" {
+		t.Fatalf("%v %v", got, err)
+	}
+	if l := f.lines()[0]; l != "lp -d Brother -n 2 -o media=A4 -o sides=two-sided-long-edge -t doc.pdf -- /home/op/doc.pdf" {
+		t.Errorf("%s", l)
+	}
+	if _, err := Print("doc.pdf", "", 1, nil, ""); err == nil {
+		t.Error("a relative file")
+	}
+	if _, err := Print("/home/op/missing.pdf", "", 1, nil, ""); err == nil {
+		t.Error("a missing file")
+	}
+	if _, err := optionsOf(map[string]any{"options": map[string]any{"sides": "x y"}}); err == nil {
+		t.Error("an option value with a space")
+	}
+	if _, err := optionsOf(map[string]any{"options": map[string]any{"-o": "x"}}); err == nil {
+		t.Error("an option name that is an option")
+	}
+	using(t, func(string, Cmd) Result { return Result{Status: 1, Stderr: "lp: Error - No default destination."} })
+	if _, err := Print("/home/op/doc.pdf", "", 1, nil, ""); err == nil || !strings.Contains(err.Error(), "no default printer") {
+		t.Errorf("%v", err)
+	}
+}
+
+type errString string
+
+func (e errString) Error() string { return string(e) }
+
+func TestDefaultReadsAndSetsThroughSudo(t *testing.T) {
+	f := theDesktop(t, func(line string, c Cmd) (Result, bool) {
+		if strings.HasPrefix(line, "sudo -n lpadmin") {
+			return ok(""), true
+		}
+		return Result{}, false
+	})
+	got, err := Default("")
+	if err != nil || got["default"] != "Brother_MFC_Novox" {
+		t.Fatalf("%v %v", got, err)
+	}
+	got, err = Default("Kanjuro")
+	if err != nil || got["default"] != "Kanjuro" || got["was"] != "Brother_MFC_Novox" {
+		t.Fatalf("%v %v", got, err)
+	}
+	if l := f.lines(); l[len(l)-1] != "sudo -n lpadmin -d Kanjuro" {
+		t.Errorf("%v", l)
+	}
+}
+
+func TestResumeEnablesAndAcceptsThroughSudo(t *testing.T) {
+	f := using(t, func(string, Cmd) Result { return ok("") })
+	if _, err := Resume("Kanjuro"); err != nil {
+		t.Fatal(err)
+	}
+	if strings.Join(f.lines(), "|") != "sudo -n cupsenable Kanjuro|sudo -n cupsaccept Kanjuro" {
+		t.Errorf("%v", f.lines())
+	}
+}
+
+func TestDriversNamesForeignDriverPackagesAndOnesNoQueueUses(t *testing.T) {
+	theDesktop(t, func(line string, c Cmd) (Result, bool) {
+		switch {
+		case strings.HasPrefix(line, "pacman -Qo"):
+			return ok("/usr/lib/cups/filter/ is owned by brother-mfc-l8390cdw 3.5.1-2\n/usr/lib/cups/filter/ is owned by cups 2:2.4.19-1\n/usr/lib/cups/filter/ is owned by cups-filters 2.0.1-2\n/usr/lib/cups/backend/ is owned by cnijfilter-mg4200 3.80-6\n/usr/lib/cups/backend/ is owned by cups 2:2.4.19-1\n"), true
+		case line == "pacman -Qqm":
+			return ok("brother-mfc-l8390cdw\ncnijfilter-mg4200\nsnapd\n"), true
+		case line == "lpinfo -m":
+			return ok("drv:///sample.drv/dymo.ppd DYMO Label Printer\ncanonmg4200.ppd Canon MG4200 series Ver.3.80\neverywhere IPP Everywhere\n"), true
+		}
+		return Result{}, false
+	})
+	got, err := Drivers("canon", 10)
+	if err != nil || len(got.Queues) != 2 || len(got.Packages) != 2 || got.Matched != 1 || got.Models[0].PPD != "canonmg4200.ppd" {
+		t.Fatalf("%+v %v", got, err)
+	}
+	if !got.Packages[0].Foreign || got.Packages[0].Package != "brother-mfc-l8390cdw" {
+		t.Errorf("%+v", got.Packages)
+	}
+	all := strings.Join(got.Findings, ";")
+	if !strings.Contains(all, "cnijfilter-mg4200 is not from the official") || strings.Contains(all, "every queue prints driverless") {
+		t.Errorf("the Canon queue uses its driver, so not every queue is driverless: %s", all)
+	}
+}

modules/cups/cmd/cups-tools/kit.go

@@ -0,0 +1,352 @@
+package main
+
+// kit.go is the same file in each of the workstations' tool bundles (fonts, docker-compose, snapd,
+// flatpak, cups, bluetooth, xclip, dmenu): how a tool runs a command, escalates, bounds what it
+// keeps, and names a failure. A module is built from its own directory, so the file is copied rather
+// than shared; a change to one copy is made to all eight.
+//
+// The rules it holds (novox/hq research 026/05, to-be 38 WP4):
+//   - the node's tool runtime runs as the operator account, not root (ADR 0175 §4); a command that
+//     needs root goes through `sudo -n`, never a prompt, and a refusal is named as such;
+//   - one command gets 20 s, below the runtime's 30 s call limit, and is ended with everything it
+//     started when it takes longer;
+//   - each stream is kept to 256 KiB, and the answer says when it was cut;
+//   - a failure is an error with what went wrong in it, never an empty answer.
+
+import (
+	"bytes"
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"os/exec"
+	"strings"
+	"syscall"
+	"time"
+)
+
+// Bounds every command is held to.
+const (
+	CallTimeout = 20 * time.Second
+	MostOutput  = 256 << 10
+)
+
+// Cmd is one command a tool runs.
+type Cmd struct {
+	Name string
+	Args []string
+	// Stdin is written to the command's standard input when not empty.
+	Stdin string
+	// Env is added to this process's own environment.
+	Env []string
+	// Root says the command needs root: it is run through `sudo -n` when this process is not root.
+	Root bool
+	// Timeout replaces CallTimeout; only a background job (jobs.go) asks for longer.
+	Timeout time.Duration
+	// Detached is for a program that forks a child which outlives it, as xclip does to keep the
+	// selection: its streams go to files, because a pipe the child inherits would hold the call open
+	// until the child exits.
+	Detached bool
+}
+
+// Result is what a command did.
+type Result struct {
+	Stdout string `json:"stdout"`
+	Stderr string `json:"stderr"`
+	Status int    `json:"status"`
+	// Error is why it did not run to an answer: "not-found" when the program is not there,
+	// "timeout" when it was ended for taking too long, else the spawn error.
+	Error     string `json:"error,omitempty"`
+	Truncated bool   `json:"truncated,omitempty"`
+}
+
+// Runner runs a command. Tests replace it; nothing else does.
+type Runner func(Cmd) Result
+
+var (
+	run  Runner = execRun
+	euid        = os.Geteuid
+)
+
+// argv is the command as it is run: through sudo without a prompt when it needs root and this
+// process is not root.
+func argv(c Cmd) (string, []string) {
+	if c.Root && euid() != 0 {
+		return "sudo", append([]string{"-n", c.Name}, c.Args...)
+	}
+	return c.Name, c.Args
+}
+
+// bounded keeps the first MostOutput bytes written to it and notes that more came.
+type bounded struct {
+	b   bytes.Buffer
+	cut bool
+}
+
+func (w *bounded) Write(p []byte) (int, error) {
+	room := MostOutput - w.b.Len()
+	if room <= 0 {
+		w.cut = w.cut || len(p) > 0
+		return len(p), nil
+	}
+	if len(p) > room {
+		w.b.Write(p[:room])
+		w.cut = true
+		return len(p), nil
+	}
+	return w.b.Write(p)
+}
+
+func execRun(c Cmd) Result {
+	timeout := c.Timeout
+	if timeout <= 0 {
+		timeout = CallTimeout
+	}
+	ctx, cancel := context.WithTimeout(context.Background(), timeout)
+	defer cancel()
+	name, args := argv(c)
+	cmd := exec.CommandContext(ctx, name, args...)
+	cmd.Env = append(append(os.Environ(), "LC_ALL=C"), c.Env...)
+	if !c.Detached {
+		// Its own process group, so that ending it on a timeout ends what it started too.
+		cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
+		cmd.Cancel = func() error {
+			if cmd.Process != nil {
+				_ = syscall.Kill(-cmd.Process.Pid, syscall.SIGKILL)
+			}
+			return nil
+		}
+	}
+	cmd.WaitDelay = 2 * time.Second
+	if c.Stdin != "" {
+		cmd.Stdin = strings.NewReader(c.Stdin)
+	}
+	var out, errs bounded
+	var outFile, errFile *os.File
+	if c.Detached {
+		var err error
+		if outFile, err = os.CreateTemp("", "mesh-tool-out-*"); err != nil {
+			return Result{Status: 127, Error: err.Error()}
+		}
+		defer os.Remove(outFile.Name())
+		defer outFile.Close()
+		if errFile, err = os.CreateTemp("", "mesh-tool-err-*"); err != nil {
+			return Result{Status: 127, Error: err.Error()}
+		}
+		defer os.Remove(errFile.Name())
+		defer errFile.Close()
+		cmd.Stdout, cmd.Stderr = outFile, errFile
+	} else {
+		cmd.Stdout, cmd.Stderr = &out, &errs
+	}
+	err := cmd.Run()
+	if c.Detached {
+		for _, f := range []struct {
+			file *os.File
+			into *bounded
+		}{{outFile, &out}, {errFile, &errs}} {
+			if _, e := f.file.Seek(0, io.SeekStart); e == nil {
+				_, _ = io.Copy(f.into, f.file)
+			}
+		}
+	}
+	r := Result{Stdout: out.b.String(), Stderr: errs.b.String(), Truncated: out.cut || errs.cut}
+	var exit *exec.ExitError
+	switch {
+	case err == nil:
+	case ctx.Err() == context.DeadlineExceeded:
+		r.Status, r.Error = 124, "timeout"
+	case errors.Is(err, exec.ErrNotFound) || errors.Is(err, os.ErrNotExist):
+		r.Status, r.Error = 127, "not-found"
+	case errors.As(err, &exit):
+		r.Status = exit.ExitCode()
+	default:
+		r.Status, r.Error = 127, err.Error()
+	}
+	return r
+}
+
+// call runs a command and answers its result, or an error naming what went wrong.
+func call(c Cmd) (Result, error) {
+	r := run(c)
+	if r.Status == 0 && r.Error == "" {
+		return r, nil
+	}
+	return r, failure(c, r)
+}
+
+// failure names how a command failed: not installed, refused escalation, too slow, or its exit
+// status with the end of what it said.
+func failure(c Cmd, r Result) error {
+	program, _ := argv(c)
+	switch {
+	case r.Error == "not-found" && program == "sudo":
+		return fmt.Errorf("%s needs root, and sudo is not installed here for the runtime's account to escalate with", c.Name)
+	case r.Error == "not-found":
+		if hint, ok := providedBy[c.Name]; ok {
+			return fmt.Errorf("%s is not installed on this machine (%s)", c.Name, hint)
+		}
+		return fmt.Errorf("%s is not installed on this machine", c.Name)
+	case r.Error == "timeout":
+		limit := c.Timeout
+		if limit <= 0 {
+			limit = CallTimeout
+		}
+		return fmt.Errorf("%s gave no answer within %s and was ended", c.Name, limit)
+	case r.Error != "":
+		return fmt.Errorf("%s did not run: %s", c.Name, r.Error)
+	case program == "sudo" && strings.Contains(r.Stderr, "command not found"):
+		if hint, ok := providedBy[c.Name]; ok {
+			return fmt.Errorf("%s is not installed on this machine (%s)", c.Name, hint)
+		}
+		return fmt.Errorf("%s is not installed on this machine", c.Name)
+	case program == "sudo" && strings.HasPrefix(strings.TrimSpace(r.Stderr), "sudo:"):
+		return fmt.Errorf("%s needs root, and sudo -n refused the runtime's account: %s (the escalation is the sudo module's to declare)",
+			c.Name, firstLine(r.Stderr))
+	}
+	said := tail(strings.TrimSpace(r.Stderr), 2000)
+	if said == "" {
+		said = tail(strings.TrimSpace(r.Stdout), 2000)
+	}
+	if said == "" {
+		said = "and said nothing"
+	}
+	return fmt.Errorf("%s %s exited %d: %s", c.Name, strings.Join(c.Args, " "), r.Status, said)
+}
+
+func firstLine(s string) string {
+	s = strings.TrimSpace(s)
+	if i := strings.IndexByte(s, '\n'); i >= 0 {
+		return s[:i]
+	}
+	return s
+}
+
+func tail(s string, n int) string {
+	if len(s) <= n {
+		return s
+	}
+	return "…" + s[len(s)-n:]
+}
+
+// lines are a command's output lines, blank ones dropped.
+func lines(s string) []string {
+	out := []string{}
+	for _, l := range strings.Split(s, "\n") {
+		if strings.TrimSpace(l) != "" {
+			out = append(out, strings.TrimRight(l, "\r"))
+		}
+	}
+	return out
+}
+
+// Arguments, read the way a tool's JSON arguments arrive.
+
+func text(args map[string]any, key string) (string, error) {
+	v, ok := args[key]
+	if !ok || v == nil {
+		return "", fmt.Errorf("%s is required", key)
+	}
+	s, ok := v.(string)
+	if !ok {
+		return "", fmt.Errorf("%s must be a string", key)
+	}
+	if strings.TrimSpace(s) == "" {
+		return "", fmt.Errorf("%s must not be empty", key)
+	}
+	return s, nil
+}
+
+func optText(args map[string]any, key, def string) (string, error) {
+	v, ok := args[key]
+	if !ok || v == nil {
+		return def, nil
+	}
+	s, ok := v.(string)
+	if !ok {
+		return "", fmt.Errorf("%s must be a string", key)
+	}
+	if strings.TrimSpace(s) == "" {
+		return def, nil
+	}
+	return s, nil
+}
+
+// optWhole reads a whole number, defaulted, refused below least and held to most.
+func optWhole(args map[string]any, key string, def, least, most int) (int, error) {
+	v, ok := args[key]
+	if !ok || v == nil {
+		return def, nil
+	}
+	f, ok := v.(float64)
+	if !ok {
+		if i, isInt := v.(int); isInt {
+			f = float64(i)
+		} else {
+			return 0, fmt.Errorf("%s must be a number", key)
+		}
+	}
+	if f != float64(int(f)) {
+		return 0, fmt.Errorf("%s must be a whole number", key)
+	}
+	n := int(f)
+	if n < least {
+		return 0, fmt.Errorf("%s must be at least %d", key, least)
+	}
+	if n > most {
+		n = most
+	}
+	return n, nil
+}
+
+func optFlag(args map[string]any, key string, def bool) (bool, error) {
+	v, ok := args[key]
+	if !ok || v == nil {
+		return def, nil
+	}
+	b, ok := v.(bool)
+	if !ok {
+		return false, fmt.Errorf("%s must be true or false", key)
+	}
+	return b, nil
+}
+
+func optList(args map[string]any, key string) ([]string, error) {
+	v, ok := args[key]
+	if !ok || v == nil {
+		return nil, nil
+	}
+	items, ok := v.([]any)
+	if !ok {
+		return nil, fmt.Errorf("%s must be a list of strings", key)
+	}
+	out := make([]string, 0, len(items))
+	for _, it := range items {
+		s, ok := it.(string)
+		if !ok || strings.TrimSpace(s) == "" {
+			return nil, fmt.Errorf("%s must be a list of non-empty strings", key)
+		}
+		out = append(out, s)
+	}
+	return out, nil
+}
+
+// oneOf refuses a value outside a closed set.
+func oneOf(key, value string, allowed ...string) error {
+	for _, a := range allowed {
+		if value == a {
+			return nil
+		}
+	}
+	return fmt.Errorf("%s must be one of %s, not %q", key, strings.Join(allowed, ", "), value)
+}
+
+// plainName refuses a name that could be read as an option or carries a path or a space: package,
+// snap, application and printer names never do.
+func plainName(key, value string) error {
+	if strings.HasPrefix(value, "-") || strings.ContainsAny(value, " \t\n/\\") {
+		return fmt.Errorf("%s %q is not a plain name", key, value)
+	}
+	return nil
+}

modules/cups/cmd/cups-tools/kit_test.go

@@ -0,0 +1,147 @@
+package main
+
+// Tests of kit.go, the same in each workstation module.
+
+import (
+	"strings"
+	"testing"
+	"time"
+)
+
+// fake records the commands asked and answers each from a function of the command line.
+type fake struct {
+	asked  []Cmd
+	answer func(line string, c Cmd) Result
+}
+
+func (f *fake) runner() Runner {
+	return func(c Cmd) Result {
+		f.asked = append(f.asked, c)
+		name, args := argv(c)
+		line := strings.TrimSpace(name + " " + strings.Join(args, " "))
+		if f.answer == nil {
+			return Result{}
+		}
+		return f.answer(line, c)
+	}
+}
+
+func (f *fake) lines() []string {
+	out := []string{}
+	for _, c := range f.asked {
+		name, args := argv(c)
+		out = append(out, strings.TrimSpace(name+" "+strings.Join(args, " ")))
+	}
+	return out
+}
+
+// using installs a fake runner and a non-root uid for one test.
+func using(t *testing.T, answer func(line string, c Cmd) Result) *fake {
+	t.Helper()
+	f := &fake{answer: answer}
+	wasRun, wasUID := run, euid
+	run, euid = f.runner(), func() int { return 1000 }
+	t.Cleanup(func() { run, euid = wasRun, wasUID })
+	return f
+}
+
+func ok(stdout string) Result { return Result{Stdout: stdout} }
+
+func TestKitAnActThatNeedsRootGoesThroughSudoWithoutAPromptUnlessAlreadyRoot(t *testing.T) {
+	was := euid
+	defer func() { euid = was }()
+	euid = func() int { return 1000 }
+	if name, args := argv(Cmd{Name: "x", Args: []string{"a"}, Root: true}); name != "sudo" || strings.Join(args, " ") != "-n x a" {
+		t.Fatalf("not root: %s %v", name, args)
+	}
+	if name, _ := argv(Cmd{Name: "x"}); name != "x" {
+		t.Fatalf("a read is run as the account: %s", name)
+	}
+	euid = func() int { return 0 }
+	if name, _ := argv(Cmd{Name: "x", Root: true}); name != "x" {
+		t.Fatalf("as root no sudo: %s", name)
+	}
+}
+
+func TestKitAFailureIsNamedByHowItFailed(t *testing.T) {
+	was := euid
+	defer func() { euid = was }()
+	euid = func() int { return 1000 }
+	cases := []struct {
+		c    Cmd
+		r    Result
+		want string
+	}{
+		{Cmd{Name: "nothere"}, Result{Status: 127, Error: "not-found"}, "not installed"},
+		{Cmd{Name: "x", Root: true}, Result{Status: 127, Error: "not-found"}, "sudo is not installed"},
+		{Cmd{Name: "x", Root: true}, Result{Status: 1, Stderr: "sudo: a password is required\n"}, "sudo -n refused"},
+		{Cmd{Name: "x", Root: true}, Result{Status: 1, Stderr: "sudo: x: command not found\n"}, "x is not installed"},
+		{Cmd{Name: "x"}, Result{Status: 124, Error: "timeout"}, "within 20s"},
+		{Cmd{Name: "x", Args: []string{"y"}}, Result{Status: 3, Stderr: "boom\n"}, "x y exited 3: boom"},
+		{Cmd{Name: "x"}, Result{Status: 3}, "said nothing"},
+	}
+	for _, k := range cases {
+		err := failure(k.c, k.r)
+		if err == nil || !strings.Contains(err.Error(), k.want) {
+			t.Errorf("%+v: %v, want %q", k.r, err, k.want)
+		}
+	}
+}
+
+func TestKitOutputIsBoundedAndSaysSo(t *testing.T) {
+	var w bounded
+	big := strings.Repeat("a", MostOutput+10)
+	n, _ := w.Write([]byte(big))
+	if n != len(big) || w.b.Len() != MostOutput || !w.cut {
+		t.Fatalf("kept %d of %d, cut %v", w.b.Len(), len(big), w.cut)
+	}
+}
+
+func TestKitTheRealRunnerRunsEndsAndReportsAMissingProgram(t *testing.T) {
+	r := execRun(Cmd{Name: "sh", Args: []string{"-c", "echo out; echo err >&2; exit 3"}})
+	if r.Status != 3 || strings.TrimSpace(r.Stdout) != "out" || strings.TrimSpace(r.Stderr) != "err" {
+		t.Fatalf("%+v", r)
+	}
+	r = execRun(Cmd{Name: "sh", Args: []string{"-c", "sleep 5 & sleep 5"}, Timeout: 200 * time.Millisecond})
+	if r.Error != "timeout" {
+		t.Fatalf("a slow command: %+v", r)
+	}
+	r = execRun(Cmd{Name: "no-such-program-anywhere"})
+	if r.Error != "not-found" {
+		t.Fatalf("a missing program: %+v", r)
+	}
+	r = execRun(Cmd{Name: "cat", Stdin: "given"})
+	if r.Stdout != "given" {
+		t.Fatalf("stdin: %+v", r)
+	}
+	start := time.Now()
+	r = execRun(Cmd{Name: "sh", Args: []string{"-c", "echo kept; (sleep 3 &) ; exit 0"}, Detached: true})
+	if r.Status != 0 || strings.TrimSpace(r.Stdout) != "kept" || time.Since(start) > 2*time.Second {
+		t.Fatalf("a detached command returns when it exits, not when its child does: %+v after %s", r, time.Since(start))
+	}
+}
+
+func TestKitArgumentsAreReadStrictly(t *testing.T) {
+	args := map[string]any{"s": "x", "n": float64(5), "f": 1.5, "b": true, "l": []any{"a", "b"}}
+	if _, err := text(args, "missing"); err == nil {
+		t.Error("a missing required string")
+	}
+	if n, _ := optWhole(args, "n", 1, 1, 3); n != 3 {
+		t.Errorf("held to most: %d", n)
+	}
+	if _, err := optWhole(args, "n", 1, 6, 9); err == nil {
+		t.Error("below least")
+	}
+	if _, err := optWhole(args, "f", 1, 0, 9); err == nil {
+		t.Error("a fraction")
+	}
+	if l, _ := optList(args, "l"); len(l) != 2 {
+		t.Errorf("list: %v", l)
+	}
+	if b, _ := optFlag(args, "b", false); !b {
+		t.Error("flag")
+	}
+	if err := plainName("name", "--all"); err == nil {
+		t.Error("an option as a name")
+	}
+}

modules/cups/cmd/cups-tools/main.go

@@ -0,0 +1,177 @@
+// The cups module's tools (novox/hq research 027/02, 026/05): the printers, their state, supplies and
+// driver, the queue, and printing, cancelling and choosing the default. A Go bundle the node's runtime
+// launches over stdio (ADR 0188, ADR 0193); it runs as the operator account. An act CUPS keeps for
+// its administrators goes through `sudo -n`.
+package main
+
+import (
+	"fmt"
+	"os"
+
+	stdio "git.novox.be/novox/mesh-sdk/go"
+)
+
+var providedBy = map[string]string{
+	"lpstat":     "the cups package, which this module installs",
+	"lpoptions":  "the cups package, which this module installs",
+	"lp":         "the cups package, which this module installs",
+	"cancel":     "the cups package, which this module installs",
+	"lpadmin":    "the cups package, which this module installs",
+	"lpinfo":     "the cups package, which this module installs",
+	"cupsenable": "the cups package, which this module installs",
+	"cupsaccept": "the cups package, which this module installs",
+	"pacman":     "this is not an Arch machine",
+}
+
+func main() {
+	if err := stdio.Serve("", tools()); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+}
+
+var printerArg = map[string]any{"type": "string", "description": "the printer's queue name, as cups_printers answers it"}
+
+func tools() []stdio.Tool {
+	return []stdio.Tool{
+		{
+			Name: "cups_printers",
+			Description: "Every printer queue: state, whether it is enabled and accepting jobs, the default, its device " +
+				"address, make and model, whether it prints driverless (IPP Everywhere), the reasons for its state, and " +
+				"supply levels where the printer reports them. (r)",
+			Input: map[string]any{},
+			Run:   func(map[string]any) (any, error) { return Printers() },
+		},
+		{
+			Name: "cups_queue",
+			Description: "The jobs waiting or printing, on every printer or one; or, with completed, the finished ones. " +
+				"Each with its id, printer, owner, size and when it was submitted. (r)",
+			Input: map[string]any{
+				"printer":   printerArg,
+				"completed": map[string]any{"type": "boolean", "description": "the finished jobs instead"},
+				"limit":     map[string]any{"type": "integer", "description": "at most this many, newest first (default 50, at most 500)"},
+			},
+			Run: func(args map[string]any) (any, error) {
+				p, err := optText(args, "printer", "")
+				if err != nil {
+					return nil, err
+				}
+				done, err := optFlag(args, "completed", false)
+				if err != nil {
+					return nil, err
+				}
+				limit, err := optWhole(args, "limit", 50, 1, 500)
+				if err != nil {
+					return nil, err
+				}
+				return Queue(p, done, limit)
+			},
+		},
+		{
+			Name: "cups_cancel",
+			Description: "Cancel one job by its id (\"Brother-12\" or 12), or every job on a printer with all. Another " +
+				"account's job is cancelled through sudo -n. (a)",
+			Input: map[string]any{
+				"job":     map[string]any{"type": "string", "description": "the job id"},
+				"printer": printerArg,
+				"all":     map[string]any{"type": "boolean", "description": "every job on printer"},
+			},
+			Run: func(args map[string]any) (any, error) {
+				job, err := optText(args, "job", "")
+				if err != nil {
+					return nil, err
+				}
+				p, err := optText(args, "printer", "")
+				if err != nil {
+					return nil, err
+				}
+				all, err := optFlag(args, "all", false)
+				if err != nil {
+					return nil, err
+				}
+				return Cancel(job, p, all)
+			},
+		},
+		{
+			Name: "cups_print",
+			Description: "Print a file on this machine, to a printer or the default, with copies and IPP options such as " +
+				"sides=two-sided-long-edge or media=A4. Answers the job id. (a)",
+			Input: map[string]any{
+				"file":    map[string]any{"type": "string", "description": "the file's absolute path on this machine"},
+				"printer": printerArg,
+				"copies":  map[string]any{"type": "integer", "description": "copies (default 1, at most 99)"},
+				"options": map[string]any{"type": "object", "additionalProperties": map[string]any{"type": "string"}, "description": "IPP options, name to value"},
+				"title":   map[string]any{"type": "string", "description": "the job's title (default the file's name)"},
+			},
+			Run: func(args map[string]any) (any, error) {
+				file, err := text(args, "file")
+				if err != nil {
+					return nil, err
+				}
+				p, err := optText(args, "printer", "")
+				if err != nil {
+					return nil, err
+				}
+				copies, err := optWhole(args, "copies", 1, 1, 99)
+				if err != nil {
+					return nil, err
+				}
+				opts, err := optionsOf(args)
+				if err != nil {
+					return nil, err
+				}
+				title, err := optText(args, "title", "")
+				if err != nil {
+					return nil, err
+				}
+				return Print(file, p, copies, opts, title)
+			},
+		},
+		{
+			Name: "cups_default",
+			Description: "The machine's default printer; with printer, make that printer the default (through sudo -n). " +
+				"The default is CUPS's own setting, kept as the operator chose it: the mesh does not declare it. (r/a)",
+			Input: map[string]any{"printer": printerArg},
+			Run: func(args map[string]any) (any, error) {
+				p, err := optText(args, "printer", "")
+				if err != nil {
+					return nil, err
+				}
+				return Default(p)
+			},
+		},
+		{
+			Name:        "cups_resume",
+			Description: "Enable a printer and make it accept jobs again, after CUPS stopped it on an error. Through sudo -n. (a)",
+			Input:       map[string]any{"printer": printerArg},
+			Run: func(args map[string]any) (any, error) {
+				p, err := text(args, "printer")
+				if err != nil {
+					return nil, err
+				}
+				return Resume(p)
+			},
+		},
+		{
+			Name: "cups_drivers",
+			Description: "What each printer prints through (driverless or a driver's PPD), the packages that bring drivers " +
+				"and backends, which of them are from outside the official repositories, and the driver models CUPS " +
+				"offers, filtered by match. (r)",
+			Input: map[string]any{
+				"match": map[string]any{"type": "string", "description": "only models whose description contains this, any case"},
+				"limit": map[string]any{"type": "integer", "description": "at most this many models (default 50, at most 1000)"},
+			},
+			Run: func(args map[string]any) (any, error) {
+				match, err := optText(args, "match", "")
+				if err != nil {
+					return nil, err
+				}
+				limit, err := optWhole(args, "limit", 50, 0, 1000)
+				if err != nil {
+					return nil, err
+				}
+				return Drivers(match, limit)
+			},
+		},
+	}
+}

modules/cups/cmd/cups-tools/manifest_kit_test.go

@@ -0,0 +1,107 @@
+package main
+
+// manifest_kit_test.go is the same file in each workstation module: it reads the module's
+// definition so the module's own tests can hold it to what it says.
+
+import (
+	"encoding/json"
+	"os"
+	"path/filepath"
+	"sort"
+	"strings"
+	"testing"
+)
+
+type manifest struct {
+	Module       string           `json:"module"`
+	Capabilities []string         `json:"capabilities"`
+	Claims       []any            `json:"claims"`
+	Seats        []any            `json:"seats"`
+	Tools        []string         `json:"tools"`
+	Resources    []map[string]any `json:"resources"`
+	Build        struct {
+		Artifacts []map[string]any `json:"artifacts"`
+	} `json:"build"`
+}
+
+func readManifest(t *testing.T) manifest {
+	t.Helper()
+	raw, err := os.ReadFile(filepath.Join("..", "..", "module.json"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	var m manifest
+	if err := json.Unmarshal(raw, &m); err != nil {
+		t.Fatalf("module.json: %v", err)
+	}
+	return m
+}
+
+func (m manifest) resource(id string) map[string]any {
+	for _, r := range m.Resources {
+		if r["id"] == id {
+			return r
+		}
+	}
+	return nil
+}
+
+// packages are the packages the module installs, sorted.
+func (m manifest) packages() []string {
+	out := []string{}
+	for _, r := range m.Resources {
+		if r["type"] == "package" && r["absent"] != true {
+			out = append(out, r["package"].(string))
+		}
+	}
+	sort.Strings(out)
+	return out
+}
+
+// services are the units the module declares, by unit name.
+func (m manifest) services() map[string]map[string]any {
+	out := map[string]map[string]any{}
+	for _, r := range m.Resources {
+		if r["type"] == "service" {
+			out[r["unit"].(string)] = r
+		}
+	}
+	return out
+}
+
+// holdsTheBundle holds the manifest to the Go bundle this directory builds: every tool registered
+// is listed and nothing else, each named <prefix>_…, and the artifact builds this command.
+func holdsTheBundle(t *testing.T, m manifest, prefix string) {
+	t.Helper()
+	registered := []string{}
+	for _, tool := range tools() {
+		registered = append(registered, tool.Name)
+		if !strings.HasPrefix(tool.Name, prefix+"_") {
+			t.Errorf("tool %s is not named %s_…", tool.Name, prefix)
+		}
+		if tool.Description == "" || tool.Run == nil || tool.Input == nil {
+			t.Errorf("tool %s is not described, runnable and given an input schema", tool.Name)
+		}
+	}
+	if strings.Join(registered, ",") != strings.Join(m.Tools, ",") {
+		t.Errorf("registered %v, listed %v", registered, m.Tools)
+	}
+	if len(m.Build.Artifacts) != 1 {
+		t.Fatalf("one artifact, got %d", len(m.Build.Artifacts))
+	}
+	cwd, _ := os.Getwd()
+	binary := filepath.Base(cwd)
+	a := m.Build.Artifacts[0]
+	want := map[string]any{"kind": "bundle", "language": "go", "system": "arch", "from": "cmd/" + binary, "binary": binary}
+	for k, v := range want {
+		if a[k] != v {
+			t.Errorf("artifact %s = %v, want %v", k, a[k], v)
+		}
+	}
+	if loads, _ := a["loads"].([]any); len(loads) != 1 || loads[0] != binary {
+		t.Errorf("artifact loads %v, want [%s]", a["loads"], binary)
+	}
+	if m.Claims != nil || m.Seats != nil {
+		t.Errorf("claims %v, seats %v: this module holds no seat", m.Claims, m.Seats)
+	}
+}

modules/cups/go.mod

@@ -0,0 +1,5 @@
+module cups
+
+go 1.22
+
+require git.novox.be/novox/mesh-sdk/go v0.1.6

modules/cups/go.sum

@@ -0,0 +1,2 @@
+git.novox.be/novox/mesh-sdk/go v0.1.6 h1:9qzdYONYbJdWcu6sxQcq9v1LI0JxcfkiKYkMUzJSkVQ=
+git.novox.be/novox/mesh-sdk/go v0.1.6/go.mod h1:GFuZUElBZ9A++mxgIKo97aXXo+kV0uJ/UkbhQPPIbrY=

modules/cups/module.json

@@ -0,0 +1,58 @@
+{
+  "module": "cups",
+  "version": "1",
+  "capabilities": [
+    "package-manager",
+    "service-manager"
+  ],
+  "tools": [
+    "cups_printers",
+    "cups_queue",
+    "cups_cancel",
+    "cups_print",
+    "cups_default",
+    "cups_resume",
+    "cups_drivers"
+  ],
+  "resources": [
+    {
+      "id": "package",
+      "type": "package",
+      "package": "cups"
+    },
+    {
+      "id": "driverless",
+      "type": "package",
+      "package": "cups-filters"
+    },
+    {
+      "id": "socket",
+      "type": "service",
+      "unit": "cups.socket",
+      "state": "running",
+      "boot": "enabled"
+    },
+    {
+      "id": "scheduler",
+      "type": "service",
+      "unit": "cups.service",
+      "state": "running",
+      "boot": "enabled"
+    }
+  ],
+  "build": {
+    "artifacts": [
+      {
+        "name": "tools",
+        "kind": "bundle",
+        "language": "go",
+        "system": "arch",
+        "from": "cmd/cups-tools",
+        "binary": "cups-tools",
+        "loads": [
+          "cups-tools"
+        ]
+      }
+    ]
+  }
+}

modules/de-spiegel/module.json

@@ -15,11 +15,11 @@
     }
   },
   "binds": {
-    "route": "/var/lib/de-spiegel/route.json"
+    "route": "${dir:state}/route.json"
   },
   "own-secrets": {
-    "smtp-user": "/var/lib/de-spiegel/smtp-user.secret",
+    "smtp-user": "${dir:state}/smtp-user.secret",
-    "smtp-pass": "/var/lib/de-spiegel/smtp-pass.secret"
+    "smtp-pass": "${dir:state}/smtp-pass.secret"
   },
   "listens": [
     {
@@ -27,20 +27,20 @@
       "port": 35621,
       "protocol": "tcp",
       "from": "mesh",
-      "why": "the de-spiegel site and its /contact endpoint over http; the public name de-spiegel.novox.be is a route grant, and route-proxy reaches it on this published port"
+      "why": "the de-spiegel site and its /contact endpoint over http; its public name is a route grant, and route-proxy reaches it on this published port"
     }
   ],
   "resources": [
     {
       "id": "state",
       "type": "directory",
-      "path": "/var/lib/de-spiegel",
+      "mode": "0700",
-      "mode": "0700"
+      "place": "."
     },
     {
       "id": "server-env",
       "type": "file",
-      "path": "/var/lib/de-spiegel/server.env",
+      "path": "${dir:state}/server.env",
       "mode": "0600",
       "content": "SMTP_AUTH_USER=${secret:smtp-user}\nSMTP_AUTH_PASS=${secret:smtp-pass}\n"
     },
@@ -56,12 +56,15 @@
       "image": "registry-api.novox.be/novox/de-spiegel@sha256:e144b72ce9c145870470d765343549f2c60211728cd118b9ff0e4029f36342ba",
       "network": "de-spiegel",
       "env-file": [
-        "/var/lib/de-spiegel/server.env"
+        "${dir:state}/server.env"
       ],
       "ports": [
         "35621"
       ],
-      "secrets-in-environment": "the application's own code reads SMTP_AUTH_USER/PASS from the environment (de-spiegel server/index.js); converting is that repository's change"
+      "secrets-in-environment": "the application's own code reads SMTP_AUTH_USER/PASS from the environment (de-spiegel server/index.js); converting is that repository's change",
+      "names-on-purpose": {
+        "registry-api.novox.be": "built outside the mesh, from the application's own repository, and pulled from the registry that built it; moves when that repository is a build source on the git seat (novox/hq ADR 0155, issue 122)"
+      }
     }
   ]
 }

modules/dhcpcd/module.json

@@ -3,7 +3,8 @@
   "version": "1",
   "capabilities": [
     "package-manager",
-    "service-manager"
+    "service-manager",
+    "uplink-dhcpcd"
   ],
   "claims": [
     {

modules/distribution/module.json

@@ -9,7 +9,7 @@
   ],
   "claims": [
     {
-      "name": "the-artifact-store",
+      "name": "mesh-artifact-store",
       "scope": "mesh"
     }
   ],
@@ -59,7 +59,10 @@
       ],
       "volumes": [
         "/var/lib/mesh-registry:/var/lib/registry"
-      ]
+      ],
+      "env": {
+        "REGISTRY_STORAGE_DELETE_ENABLED": "true"
+      }
     }
   ]
 }

modules/dmenu/README.md

@@ -0,0 +1,56 @@
+# dmenu
+
+The suckless menu, as a module (novox/hq research 026/04: "`dmenu` is a module of its own (official
+repositories), able to hold the same seat on a machine that wants it"; to-be 42 phase 2 step 7).
+
+## Owns
+
+| what | where |
+|---|---|
+| `dmenu`, `dmenu_run`, `dmenu_path`, `stest` | package `dmenu` (official repositories) |
+
+## Improves: two broken calls work by existing
+
+Research 026/04 measured "plain `dmenu` in two places" in the operator's configuration, with dmenu
+installed on neither workstation, so both failed. Measured again on 2026-10-04, the two are one line on
+each workstation, in the notifier's configuration:
+
+- `~/.config/dunst/dunstrc`: `dmenu = /usr/bin/dmenu -p dunst:`
+
+It is the menu dunst opens to pick a notification's action or link. Every other menu in the
+operator's scripts calls `rofi -dmenu`. Once this module installs the package, `/usr/bin/dmenu` exists
+and that menu opens. The `dunst` module may later point the line at the launcher seat's command
+instead (below). The line is that module's to own, so this module does not touch it.
+
+## The seat it would hold: not claimed yet
+
+Research 026/04 gives `node-launcher` to `rofi`, with a dmenu-compatible command as part of its
+protocol, and lets `dmenu` hold the same seat on a machine that wants it. **The seat is not in the
+controller's seat table yet**, and a claim on an unknown seat is refused. So this module claims
+nothing. Its tool `dmenu_menu` is shaped like the seat's `menu` verb (research 026/05): show a list,
+answer the chosen line. When the seat is recorded, the claim is one line here, serving `menu`.
+
+## Tools
+
+All answer JSON. `(r)` reads; `(d)` acts in the operator's session.
+
+| tool | what |
+|---|---|
+| `dmenu_menu` (d) | show up to 1000 choices, with a prompt, as one line or a vertical list, case-insensitive by default. Answers the chosen line and its index; a typed line that is not a choice (`typed`); `cancelled` when dismissed; `timed_out` when not answered in time (default 20 s, at most 25, below the runtime's 30 s call limit) |
+| `dmenu_session` (r) | the session the menu would appear in and how it was found, or why there is none; dmenu's version |
+
+**Reaching the session** works as the `xclip` module's README describes: the runtime runs as the
+account with no session words, and `session.go` finds the account's display and cookie from its own
+processes. With no session, the tool says so and shows nothing. A keyboard held by another program
+(a locked screen, an open menu) is answered as such.
+
+The menu draws in fontconfig's `monospace` at dmenu's default size, which the `fonts` module makes
+JetBrains Mono Nerd Font.
+
+## What changes when it is assigned
+
+On both workstations, the `dmenu` package is installed, which neither has today. Nothing else.
+
+## Leaves as found
+
+The notifier's configuration, and every `rofi -dmenu` call in the operator's scripts.

modules/dmenu/cmd/dmenu-tools/dmenu.go

@@ -0,0 +1,112 @@
+package main
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+	"time"
+)
+
+// MostWait is the longest a menu stays open: below the runtime's 30 s call limit, so an unanswered
+// menu is answered as such rather than as a call the runtime gave up on.
+const MostWait = 25
+
+// MostChoices bounds the list.
+const MostChoices = 1000
+
+// Ask is one menu.
+type Ask struct {
+	Choices         []string
+	Prompt          string
+	Lines           int
+	CaseInsensitive bool
+	Timeout         int
+}
+
+// MenuAnswer is what dmenu_menu answers.
+type MenuAnswer struct {
+	Chosen    string  `json:"chosen,omitempty"`
+	Index     int     `json:"index"`
+	Typed     bool    `json:"typed"`
+	Cancelled bool    `json:"cancelled"`
+	TimedOut  bool    `json:"timed_out"`
+	Session   Session `json:"session"`
+}
+
+// Menu shows the choices and answers the one taken. dmenu prints the selected (or typed) line and
+// exits 0; it exits 1 with nothing printed when dismissed.
+func Menu(a Ask) (MenuAnswer, error) {
+	if len(a.Choices) == 0 {
+		return MenuAnswer{}, fmt.Errorf("choices is required: at least one line")
+	}
+	if len(a.Choices) > MostChoices {
+		return MenuAnswer{}, fmt.Errorf("%d choices; at most %d are shown", len(a.Choices), MostChoices)
+	}
+	for _, c := range a.Choices {
+		if strings.ContainsAny(c, "\n\r") {
+			return MenuAnswer{}, fmt.Errorf("a choice holds a line break: %q", c)
+		}
+	}
+	if strings.ContainsAny(a.Prompt, "\n\r") {
+		return MenuAnswer{}, fmt.Errorf("the prompt holds a line break")
+	}
+	s, err := findSession()
+	if err != nil {
+		return MenuAnswer{}, err
+	}
+	args := []string{}
+	if a.CaseInsensitive {
+		args = append(args, "-i")
+	}
+	if a.Lines > 0 {
+		args = append(args, "-l", strconv.Itoa(a.Lines))
+	}
+	if a.Prompt != "" {
+		args = append(args, "-p", a.Prompt)
+	}
+	c := Cmd{Name: "dmenu", Args: args, Stdin: strings.Join(a.Choices, "\n") + "\n", Env: s.Env(), Timeout: time.Duration(a.Timeout) * time.Second}
+	r := run(c)
+	out := MenuAnswer{Index: -1, Session: s}
+	switch {
+	case r.Error == "timeout":
+		out.TimedOut = true
+		return out, nil
+	case r.Error != "":
+		return MenuAnswer{}, failure(c, r)
+	case strings.Contains(r.Stderr, "cannot open display"):
+		return MenuAnswer{}, fmt.Errorf("the X session at %s (found by %s) refused the connection", s.Display, s.FoundBy)
+	case strings.Contains(r.Stderr, "cannot grab keyboard"):
+		return MenuAnswer{}, fmt.Errorf("dmenu could not take the keyboard: another program holds it (a locked screen, an open menu)")
+	case r.Status == 1 && strings.TrimSpace(r.Stdout) == "":
+		out.Cancelled = true
+		return out, nil
+	case r.Status != 0:
+		return MenuAnswer{}, failure(c, r)
+	}
+	out.Chosen = strings.TrimRight(r.Stdout, "\r\n")
+	for i, ch := range a.Choices {
+		if ch == out.Chosen {
+			out.Index = i
+			break
+		}
+	}
+	out.Typed = out.Index < 0
+	return out, nil
+}
+
+// SessionCheck answers the session the menu would appear in, and dmenu's version.
+func SessionCheck() (map[string]any, error) {
+	out := map[string]any{}
+	if r := run(Cmd{Name: "dmenu", Args: []string{"-v"}}); r.Error == "" {
+		out["dmenu"] = strings.TrimSpace(r.Stdout + r.Stderr)
+	} else {
+		out["dmenu"] = failure(Cmd{Name: "dmenu"}, r).Error()
+	}
+	s, err := findSession()
+	if err != nil {
+		out["found"], out["why"] = false, err.Error()
+		return out, nil
+	}
+	out["found"], out["session"] = true, s
+	return out, nil
+}

modules/dmenu/cmd/dmenu-tools/dmenu_test.go

@@ -0,0 +1,108 @@
+package main
+
+import (
+	"strings"
+	"testing"
+	"time"
+)
+
+func TestTheManifestIsThePackageAndClaimsNoSeatYet(t *testing.T) {
+	m := readManifest(t)
+	// holdsTheBundle also holds it to no claim: node-launcher is not in the controller's seat table
+	// yet (README).
+	holdsTheBundle(t, m, "dmenu")
+	if got := strings.Join(m.packages(), ","); got != "dmenu" || len(m.Resources) != 1 {
+		t.Errorf("packages %s, resources %v", got, m.Resources)
+	}
+}
+
+func aSession(t *testing.T) {
+	t.Helper()
+	_, sockets := aMachine(t, map[string]string{"DISPLAY": ":1", "XAUTHORITY": "/home/op/.Xauthority"})
+	aSocket(t, sockets, "X1")
+}
+
+func TestMenuShowsTheChoicesInTheSessionAndAnswersTheOneTaken(t *testing.T) {
+	aSession(t)
+	f := using(t, func(string, Cmd) Result { return ok("Lock\n") })
+	got, err := Menu(Ask{Choices: []string{"Shutdown", "Lock"}, Prompt: "power:", Lines: 5, CaseInsensitive: true, Timeout: 20})
+	if err != nil || got.Chosen != "Lock" || got.Index != 1 || got.Typed || got.Cancelled || got.TimedOut {
+		t.Fatalf("%+v %v", got, err)
+	}
+	c := f.asked[0]
+	if f.lines()[0] != "dmenu -i -l 5 -p power:" || c.Stdin != "Shutdown\nLock\n" || c.Timeout != 20*time.Second {
+		t.Errorf("%v %+v", f.lines(), c)
+	}
+	if strings.Join(c.Env, " ") != "DISPLAY=:1 XAUTHORITY=/home/op/.Xauthority" {
+		t.Errorf("env %v", c.Env)
+	}
+}
+
+func TestMenuTellsTypedDismissedAndUnansweredApart(t *testing.T) {
+	aSession(t)
+	answer := ok("something else\n")
+	using(t, func(string, Cmd) Result { return answer })
+	got, err := Menu(Ask{Choices: []string{"a"}, Timeout: 5})
+	if err != nil || !got.Typed || got.Index != -1 || got.Chosen != "something else" {
+		t.Errorf("typed: %+v %v", got, err)
+	}
+	answer = Result{Status: 1}
+	got, err = Menu(Ask{Choices: []string{"a"}, Timeout: 5})
+	if err != nil || !got.Cancelled || got.Chosen != "" {
+		t.Errorf("dismissed: %+v %v", got, err)
+	}
+	answer = Result{Status: 124, Error: "timeout"}
+	got, err = Menu(Ask{Choices: []string{"a"}, Timeout: 5})
+	if err != nil || !got.TimedOut {
+		t.Errorf("unanswered: %+v %v", got, err)
+	}
+	answer = Result{Status: 1, Stderr: "cannot grab keyboard\n"}
+	if _, err := Menu(Ask{Choices: []string{"a"}, Timeout: 5}); err == nil || !strings.Contains(err.Error(), "keyboard") {
+		t.Errorf("a held keyboard: %v", err)
+	}
+	answer = Result{Status: 1, Stderr: "cannot open display\n"}
+	if _, err := Menu(Ask{Choices: []string{"a"}, Timeout: 5}); err == nil || !strings.Contains(err.Error(), "refused") {
+		t.Errorf("a refusing display: %v", err)
+	}
+}
+
+func TestMenuRefusesWhatCannotBeShownAndRunsNothingWithoutASession(t *testing.T) {
+	aSession(t)
+	f := using(t, func(string, Cmd) Result { return ok("") })
+	for _, bad := range []Ask{{}, {Choices: []string{"a\nb"}}, {Choices: []string{"a"}, Prompt: "x\ny"}, {Choices: make([]string, MostChoices+1)}} {
+		if _, err := Menu(bad); err == nil {
+			t.Errorf("%+v accepted", bad)
+		}
+	}
+	aMachine(t, map[string]string{})
+	if _, err := Menu(Ask{Choices: []string{"a"}, Timeout: 5}); err == nil || !strings.Contains(err.Error(), "no graphical session") {
+		t.Errorf("%v", err)
+	}
+	if len(f.asked) != 0 {
+		t.Errorf("ran %v", f.lines())
+	}
+}
+
+func TestTheWaitIsBelowTheRuntimesCallLimit(t *testing.T) {
+	if MostWait >= 30 {
+		t.Fatalf("a menu may stay open %d s; the runtime gives a call 30", MostWait)
+	}
+	n, _ := optWhole(map[string]any{"timeout_seconds": float64(600)}, "timeout_seconds", 20, 1, MostWait)
+	if n != MostWait {
+		t.Errorf("%d", n)
+	}
+}
+
+func TestSessionCheckSaysTheVersionAndTheSession(t *testing.T) {
+	aSession(t)
+	using(t, func(string, Cmd) Result { return ok("dmenu-5.4\n") })
+	got, err := SessionCheck()
+	if err != nil || got["dmenu"] != "dmenu-5.4" || got["found"] != true {
+		t.Fatalf("%v %v", got, err)
+	}
+	using(t, func(string, Cmd) Result { return Result{Status: 127, Error: "not-found"} })
+	got, _ = SessionCheck()
+	if !strings.Contains(got["dmenu"].(string), "not installed") {
+		t.Errorf("%v", got)
+	}
+}

modules/dmenu/cmd/dmenu-tools/kit.go

@@ -0,0 +1,352 @@
+package main
+
+// kit.go is the same file in each of the workstations' tool bundles (fonts, docker-compose, snapd,
+// flatpak, cups, bluetooth, xclip, dmenu): how a tool runs a command, escalates, bounds what it
+// keeps, and names a failure. A module is built from its own directory, so the file is copied rather
+// than shared; a change to one copy is made to all eight.
+//
+// The rules it holds (novox/hq research 026/05, to-be 38 WP4):
+//   - the node's tool runtime runs as the operator account, not root (ADR 0175 §4); a command that
+//     needs root goes through `sudo -n`, never a prompt, and a refusal is named as such;
+//   - one command gets 20 s, below the runtime's 30 s call limit, and is ended with everything it
+//     started when it takes longer;
+//   - each stream is kept to 256 KiB, and the answer says when it was cut;
+//   - a failure is an error with what went wrong in it, never an empty answer.
+
+import (
+	"bytes"
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"os/exec"
+	"strings"
+	"syscall"
+	"time"
+)
+
+// Bounds every command is held to.
+const (
+	CallTimeout = 20 * time.Second
+	MostOutput  = 256 << 10
+)
+
+// Cmd is one command a tool runs.
+type Cmd struct {
+	Name string
+	Args []string
+	// Stdin is written to the command's standard input when not empty.
+	Stdin string
+	// Env is added to this process's own environment.
+	Env []string
+	// Root says the command needs root: it is run through `sudo -n` when this process is not root.
+	Root bool
+	// Timeout replaces CallTimeout; only a background job (jobs.go) asks for longer.
+	Timeout time.Duration
+	// Detached is for a program that forks a child which outlives it, as xclip does to keep the
+	// selection: its streams go to files, because a pipe the child inherits would hold the call open
+	// until the child exits.
+	Detached bool
+}
+
+// Result is what a command did.
+type Result struct {
+	Stdout string `json:"stdout"`
+	Stderr string `json:"stderr"`
+	Status int    `json:"status"`
+	// Error is why it did not run to an answer: "not-found" when the program is not there,
+	// "timeout" when it was ended for taking too long, else the spawn error.
+	Error     string `json:"error,omitempty"`
+	Truncated bool   `json:"truncated,omitempty"`
+}
+
+// Runner runs a command. Tests replace it; nothing else does.
+type Runner func(Cmd) Result
+
+var (
+	run  Runner = execRun
+	euid        = os.Geteuid
+)
+
+// argv is the command as it is run: through sudo without a prompt when it needs root and this
+// process is not root.
+func argv(c Cmd) (string, []string) {
+	if c.Root && euid() != 0 {
+		return "sudo", append([]string{"-n", c.Name}, c.Args...)
+	}
+	return c.Name, c.Args
+}
+
+// bounded keeps the first MostOutput bytes written to it and notes that more came.
+type bounded struct {
+	b   bytes.Buffer
+	cut bool
+}
+
+func (w *bounded) Write(p []byte) (int, error) {
+	room := MostOutput - w.b.Len()
+	if room <= 0 {
+		w.cut = w.cut || len(p) > 0
+		return len(p), nil
+	}
+	if len(p) > room {
+		w.b.Write(p[:room])
+		w.cut = true
+		return len(p), nil
+	}
+	return w.b.Write(p)
+}
+
+func execRun(c Cmd) Result {
+	timeout := c.Timeout
+	if timeout <= 0 {
+		timeout = CallTimeout
+	}
+	ctx, cancel := context.WithTimeout(context.Background(), timeout)
+	defer cancel()
+	name, args := argv(c)
+	cmd := exec.CommandContext(ctx, name, args...)
+	cmd.Env = append(append(os.Environ(), "LC_ALL=C"), c.Env...)
+	if !c.Detached {
+		// Its own process group, so that ending it on a timeout ends what it started too.
+		cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
+		cmd.Cancel = func() error {
+			if cmd.Process != nil {
+				_ = syscall.Kill(-cmd.Process.Pid, syscall.SIGKILL)
+			}
+			return nil
+		}
+	}
+	cmd.WaitDelay = 2 * time.Second
+	if c.Stdin != "" {
+		cmd.Stdin = strings.NewReader(c.Stdin)
+	}
+	var out, errs bounded
+	var outFile, errFile *os.File
+	if c.Detached {
+		var err error
+		if outFile, err = os.CreateTemp("", "mesh-tool-out-*"); err != nil {
+			return Result{Status: 127, Error: err.Error()}
+		}
+		defer os.Remove(outFile.Name())
+		defer outFile.Close()
+		if errFile, err = os.CreateTemp("", "mesh-tool-err-*"); err != nil {
+			return Result{Status: 127, Error: err.Error()}
+		}
+		defer os.Remove(errFile.Name())
+		defer errFile.Close()
+		cmd.Stdout, cmd.Stderr = outFile, errFile
+	} else {
+		cmd.Stdout, cmd.Stderr = &out, &errs
+	}
+	err := cmd.Run()
+	if c.Detached {
+		for _, f := range []struct {
+			file *os.File
+			into *bounded
+		}{{outFile, &out}, {errFile, &errs}} {
+			if _, e := f.file.Seek(0, io.SeekStart); e == nil {
+				_, _ = io.Copy(f.into, f.file)
+			}
+		}
+	}
+	r := Result{Stdout: out.b.String(), Stderr: errs.b.String(), Truncated: out.cut || errs.cut}
+	var exit *exec.ExitError
+	switch {
+	case err == nil:
+	case ctx.Err() == context.DeadlineExceeded:
+		r.Status, r.Error = 124, "timeout"
+	case errors.Is(err, exec.ErrNotFound) || errors.Is(err, os.ErrNotExist):
+		r.Status, r.Error = 127, "not-found"
+	case errors.As(err, &exit):
+		r.Status = exit.ExitCode()
+	default:
+		r.Status, r.Error = 127, err.Error()
+	}
+	return r
+}
+
+// call runs a command and answers its result, or an error naming what went wrong.
+func call(c Cmd) (Result, error) {
+	r := run(c)
+	if r.Status == 0 && r.Error == "" {
+		return r, nil
+	}
+	return r, failure(c, r)
+}
+
+// failure names how a command failed: not installed, refused escalation, too slow, or its exit
+// status with the end of what it said.
+func failure(c Cmd, r Result) error {
+	program, _ := argv(c)
+	switch {
+	case r.Error == "not-found" && program == "sudo":
+		return fmt.Errorf("%s needs root, and sudo is not installed here for the runtime's account to escalate with", c.Name)
+	case r.Error == "not-found":
+		if hint, ok := providedBy[c.Name]; ok {
+			return fmt.Errorf("%s is not installed on this machine (%s)", c.Name, hint)
+		}
+		return fmt.Errorf("%s is not installed on this machine", c.Name)
+	case r.Error == "timeout":
+		limit := c.Timeout
+		if limit <= 0 {
+			limit = CallTimeout
+		}
+		return fmt.Errorf("%s gave no answer within %s and was ended", c.Name, limit)
+	case r.Error != "":
+		return fmt.Errorf("%s did not run: %s", c.Name, r.Error)
+	case program == "sudo" && strings.Contains(r.Stderr, "command not found"):
+		if hint, ok := providedBy[c.Name]; ok {
+			return fmt.Errorf("%s is not installed on this machine (%s)", c.Name, hint)
+		}
+		return fmt.Errorf("%s is not installed on this machine", c.Name)
+	case program == "sudo" && strings.HasPrefix(strings.TrimSpace(r.Stderr), "sudo:"):
+		return fmt.Errorf("%s needs root, and sudo -n refused the runtime's account: %s (the escalation is the sudo module's to declare)",
+			c.Name, firstLine(r.Stderr))
+	}
+	said := tail(strings.TrimSpace(r.Stderr), 2000)
+	if said == "" {
+		said = tail(strings.TrimSpace(r.Stdout), 2000)
+	}
+	if said == "" {
+		said = "and said nothing"
+	}
+	return fmt.Errorf("%s %s exited %d: %s", c.Name, strings.Join(c.Args, " "), r.Status, said)
+}
+
+func firstLine(s string) string {
+	s = strings.TrimSpace(s)
+	if i := strings.IndexByte(s, '\n'); i >= 0 {
+		return s[:i]
+	}
+	return s
+}
+
+func tail(s string, n int) string {
+	if len(s) <= n {
+		return s
+	}
+	return "…" + s[len(s)-n:]
+}
+
+// lines are a command's output lines, blank ones dropped.
+func lines(s string) []string {
+	out := []string{}
+	for _, l := range strings.Split(s, "\n") {
+		if strings.TrimSpace(l) != "" {
+			out = append(out, strings.TrimRight(l, "\r"))
+		}
+	}
+	return out
+}
+
+// Arguments, read the way a tool's JSON arguments arrive.
+
+func text(args map[string]any, key string) (string, error) {
+	v, ok := args[key]
+	if !ok || v == nil {
+		return "", fmt.Errorf("%s is required", key)
+	}
+	s, ok := v.(string)
+	if !ok {
+		return "", fmt.Errorf("%s must be a string", key)
+	}
+	if strings.TrimSpace(s) == "" {
+		return "", fmt.Errorf("%s must not be empty", key)
+	}
+	return s, nil
+}
+
+func optText(args map[string]any, key, def string) (string, error) {
+	v, ok := args[key]
+	if !ok || v == nil {
+		return def, nil
+	}
+	s, ok := v.(string)
+	if !ok {
+		return "", fmt.Errorf("%s must be a string", key)
+	}
+	if strings.TrimSpace(s) == "" {
+		return def, nil
+	}
+	return s, nil
+}
+
+// optWhole reads a whole number, defaulted, refused below least and held to most.
+func optWhole(args map[string]any, key string, def, least, most int) (int, error) {
+	v, ok := args[key]
+	if !ok || v == nil {
+		return def, nil
+	}
+	f, ok := v.(float64)
+	if !ok {
+		if i, isInt := v.(int); isInt {
+			f = float64(i)
+		} else {
+			return 0, fmt.Errorf("%s must be a number", key)
+		}
+	}
+	if f != float64(int(f)) {
+		return 0, fmt.Errorf("%s must be a whole number", key)
+	}
+	n := int(f)
+	if n < least {
+		return 0, fmt.Errorf("%s must be at least %d", key, least)
+	}
+	if n > most {
+		n = most
+	}
+	return n, nil
+}
+
+func optFlag(args map[string]any, key string, def bool) (bool, error) {
+	v, ok := args[key]
+	if !ok || v == nil {
+		return def, nil
+	}
+	b, ok := v.(bool)
+	if !ok {
+		return false, fmt.Errorf("%s must be true or false", key)
+	}
+	return b, nil
+}
+
+func optList(args map[string]any, key string) ([]string, error) {
+	v, ok := args[key]
+	if !ok || v == nil {
+		return nil, nil
+	}
+	items, ok := v.([]any)
+	if !ok {
+		return nil, fmt.Errorf("%s must be a list of strings", key)
+	}
+	out := make([]string, 0, len(items))
+	for _, it := range items {
+		s, ok := it.(string)
+		if !ok || strings.TrimSpace(s) == "" {
+			return nil, fmt.Errorf("%s must be a list of non-empty strings", key)
+		}
+		out = append(out, s)
+	}
+	return out, nil
+}
+
+// oneOf refuses a value outside a closed set.
+func oneOf(key, value string, allowed ...string) error {
+	for _, a := range allowed {
+		if value == a {
+			return nil
+		}
+	}
+	return fmt.Errorf("%s must be one of %s, not %q", key, strings.Join(allowed, ", "), value)
+}
+
+// plainName refuses a name that could be read as an option or carries a path or a space: package,
+// snap, application and printer names never do.
+func plainName(key, value string) error {
+	if strings.HasPrefix(value, "-") || strings.ContainsAny(value, " \t\n/\\") {
+		return fmt.Errorf("%s %q is not a plain name", key, value)
+	}
+	return nil
+}

modules/dmenu/cmd/dmenu-tools/kit_test.go

@@ -0,0 +1,147 @@
+package main
+
+// Tests of kit.go, the same in each workstation module.
+
+import (
+	"strings"
+	"testing"
+	"time"
+)
+
+// fake records the commands asked and answers each from a function of the command line.
+type fake struct {
+	asked  []Cmd
+	answer func(line string, c Cmd) Result
+}
+
+func (f *fake) runner() Runner {
+	return func(c Cmd) Result {
+		f.asked = append(f.asked, c)
+		name, args := argv(c)
+		line := strings.TrimSpace(name + " " + strings.Join(args, " "))
+		if f.answer == nil {
+			return Result{}
+		}
+		return f.answer(line, c)
+	}
+}
+
+func (f *fake) lines() []string {
+	out := []string{}
+	for _, c := range f.asked {
+		name, args := argv(c)
+		out = append(out, strings.TrimSpace(name+" "+strings.Join(args, " ")))
+	}
+	return out
+}
+
+// using installs a fake runner and a non-root uid for one test.
+func using(t *testing.T, answer func(line string, c Cmd) Result) *fake {
+	t.Helper()
+	f := &fake{answer: answer}
+	wasRun, wasUID := run, euid
+	run, euid = f.runner(), func() int { return 1000 }
+	t.Cleanup(func() { run, euid = wasRun, wasUID })
+	return f
+}
+
+func ok(stdout string) Result { return Result{Stdout: stdout} }
+
+func TestKitAnActThatNeedsRootGoesThroughSudoWithoutAPromptUnlessAlreadyRoot(t *testing.T) {
+	was := euid
+	defer func() { euid = was }()
+	euid = func() int { return 1000 }
+	if name, args := argv(Cmd{Name: "x", Args: []string{"a"}, Root: true}); name != "sudo" || strings.Join(args, " ") != "-n x a" {
+		t.Fatalf("not root: %s %v", name, args)
+	}
+	if name, _ := argv(Cmd{Name: "x"}); name != "x" {
+		t.Fatalf("a read is run as the account: %s", name)
+	}
+	euid = func() int { return 0 }
+	if name, _ := argv(Cmd{Name: "x", Root: true}); name != "x" {
+		t.Fatalf("as root no sudo: %s", name)
+	}
+}
+
+func TestKitAFailureIsNamedByHowItFailed(t *testing.T) {
+	was := euid
+	defer func() { euid = was }()
+	euid = func() int { return 1000 }
+	cases := []struct {
+		c    Cmd
+		r    Result
+		want string
+	}{
+		{Cmd{Name: "nothere"}, Result{Status: 127, Error: "not-found"}, "not installed"},
+		{Cmd{Name: "x", Root: true}, Result{Status: 127, Error: "not-found"}, "sudo is not installed"},
+		{Cmd{Name: "x", Root: true}, Result{Status: 1, Stderr: "sudo: a password is required\n"}, "sudo -n refused"},
+		{Cmd{Name: "x", Root: true}, Result{Status: 1, Stderr: "sudo: x: command not found\n"}, "x is not installed"},
+		{Cmd{Name: "x"}, Result{Status: 124, Error: "timeout"}, "within 20s"},
+		{Cmd{Name: "x", Args: []string{"y"}}, Result{Status: 3, Stderr: "boom\n"}, "x y exited 3: boom"},
+		{Cmd{Name: "x"}, Result{Status: 3}, "said nothing"},
+	}
+	for _, k := range cases {
+		err := failure(k.c, k.r)
+		if err == nil || !strings.Contains(err.Error(), k.want) {
+			t.Errorf("%+v: %v, want %q", k.r, err, k.want)
+		}
+	}
+}
+
+func TestKitOutputIsBoundedAndSaysSo(t *testing.T) {
+	var w bounded
+	big := strings.Repeat("a", MostOutput+10)
+	n, _ := w.Write([]byte(big))
+	if n != len(big) || w.b.Len() != MostOutput || !w.cut {
+		t.Fatalf("kept %d of %d, cut %v", w.b.Len(), len(big), w.cut)
+	}
+}
+
+func TestKitTheRealRunnerRunsEndsAndReportsAMissingProgram(t *testing.T) {
+	r := execRun(Cmd{Name: "sh", Args: []string{"-c", "echo out; echo err >&2; exit 3"}})
+	if r.Status != 3 || strings.TrimSpace(r.Stdout) != "out" || strings.TrimSpace(r.Stderr) != "err" {
+		t.Fatalf("%+v", r)
+	}
+	r = execRun(Cmd{Name: "sh", Args: []string{"-c", "sleep 5 & sleep 5"}, Timeout: 200 * time.Millisecond})
+	if r.Error != "timeout" {
+		t.Fatalf("a slow command: %+v", r)
+	}
+	r = execRun(Cmd{Name: "no-such-program-anywhere"})
+	if r.Error != "not-found" {
+		t.Fatalf("a missing program: %+v", r)
+	}
+	r = execRun(Cmd{Name: "cat", Stdin: "given"})
+	if r.Stdout != "given" {
+		t.Fatalf("stdin: %+v", r)
+	}
+	start := time.Now()
+	r = execRun(Cmd{Name: "sh", Args: []string{"-c", "echo kept; (sleep 3 &) ; exit 0"}, Detached: true})
+	if r.Status != 0 || strings.TrimSpace(r.Stdout) != "kept" || time.Since(start) > 2*time.Second {
+		t.Fatalf("a detached command returns when it exits, not when its child does: %+v after %s", r, time.Since(start))
+	}
+}
+
+func TestKitArgumentsAreReadStrictly(t *testing.T) {
+	args := map[string]any{"s": "x", "n": float64(5), "f": 1.5, "b": true, "l": []any{"a", "b"}}
+	if _, err := text(args, "missing"); err == nil {
+		t.Error("a missing required string")
+	}
+	if n, _ := optWhole(args, "n", 1, 1, 3); n != 3 {
+		t.Errorf("held to most: %d", n)
+	}
+	if _, err := optWhole(args, "n", 1, 6, 9); err == nil {
+		t.Error("below least")
+	}
+	if _, err := optWhole(args, "f", 1, 0, 9); err == nil {
+		t.Error("a fraction")
+	}
+	if l, _ := optList(args, "l"); len(l) != 2 {
+		t.Errorf("list: %v", l)
+	}
+	if b, _ := optFlag(args, "b", false); !b {
+		t.Error("flag")
+	}
+	if err := plainName("name", "--all"); err == nil {
+		t.Error("an option as a name")
+	}
+}

modules/dmenu/cmd/dmenu-tools/main.go

@@ -0,0 +1,70 @@
+// The dmenu module's tool (novox/hq research 026/04, 026/05): show the operator a menu of choices in
+// the graphical session and answer the one chosen — the dmenu-compatible command as a tool. A Go
+// bundle the node's runtime launches over stdio (ADR 0188, ADR 0193). It runs as the operator account
+// and reaches the account's X session as session.go finds it; with no session, it says so.
+package main
+
+import (
+	"fmt"
+	"os"
+
+	stdio "git.novox.be/novox/mesh-sdk/go"
+)
+
+var providedBy = map[string]string{
+	"dmenu": "the dmenu package, which this module installs",
+}
+
+func main() {
+	if err := stdio.Serve("", tools()); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+}
+
+func tools() []stdio.Tool {
+	return []stdio.Tool{
+		{
+			Name: "dmenu_menu",
+			Description: "Show the operator a menu of choices on their screen and answer the line chosen, its index, or " +
+				"that the menu was dismissed or not answered in time (default 20 s, at most 25). The operator may also " +
+				"type a line that is not a choice. Needs the operator's graphical session. (d)",
+			Input: map[string]any{
+				"choices":          map[string]any{"type": "array", "items": map[string]any{"type": "string"}, "description": "the lines to choose from, at most 1000, none with a line break"},
+				"prompt":           map[string]any{"type": "string", "description": "a prompt shown left of the input"},
+				"lines":            map[string]any{"type": "integer", "description": "show the choices as a vertical list of this many lines (default 0: one horizontal line; at most 40)"},
+				"case_insensitive": map[string]any{"type": "boolean", "description": "match what is typed regardless of case (default true)"},
+				"timeout_seconds":  map[string]any{"type": "integer", "description": "close the menu unanswered after this long (default 20, at most 25)"},
+			},
+			Run: func(args map[string]any) (any, error) {
+				choices, err := optList(args, "choices")
+				if err != nil {
+					return nil, err
+				}
+				prompt, err := optText(args, "prompt", "")
+				if err != nil {
+					return nil, err
+				}
+				n, err := optWhole(args, "lines", 0, 0, 40)
+				if err != nil {
+					return nil, err
+				}
+				ci, err := optFlag(args, "case_insensitive", true)
+				if err != nil {
+					return nil, err
+				}
+				timeout, err := optWhole(args, "timeout_seconds", 20, 1, MostWait)
+				if err != nil {
+					return nil, err
+				}
+				return Menu(Ask{Choices: choices, Prompt: prompt, Lines: n, CaseInsensitive: ci, Timeout: timeout})
+			},
+		},
+		{
+			Name:        "dmenu_session",
+			Description: "Which X session the menu would appear in and how it was found, or why there is none; and dmenu's version. (r)",
+			Input:       map[string]any{},
+			Run:         func(map[string]any) (any, error) { return SessionCheck() },
+		},
+	}
+}

modules/dmenu/cmd/dmenu-tools/manifest_kit_test.go

@@ -0,0 +1,107 @@
+package main
+
+// manifest_kit_test.go is the same file in each workstation module: it reads the module's
+// definition so the module's own tests can hold it to what it says.
+
+import (
+	"encoding/json"
+	"os"
+	"path/filepath"
+	"sort"
+	"strings"
+	"testing"
+)
+
+type manifest struct {
+	Module       string           `json:"module"`
+	Capabilities []string         `json:"capabilities"`
+	Claims       []any            `json:"claims"`
+	Seats        []any            `json:"seats"`
+	Tools        []string         `json:"tools"`
+	Resources    []map[string]any `json:"resources"`
+	Build        struct {
+		Artifacts []map[string]any `json:"artifacts"`
+	} `json:"build"`
+}
+
+func readManifest(t *testing.T) manifest {
+	t.Helper()
+	raw, err := os.ReadFile(filepath.Join("..", "..", "module.json"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	var m manifest
+	if err := json.Unmarshal(raw, &m); err != nil {
+		t.Fatalf("module.json: %v", err)
+	}
+	return m
+}
+
+func (m manifest) resource(id string) map[string]any {
+	for _, r := range m.Resources {
+		if r["id"] == id {
+			return r
+		}
+	}
+	return nil
+}
+
+// packages are the packages the module installs, sorted.
+func (m manifest) packages() []string {
+	out := []string{}
+	for _, r := range m.Resources {
+		if r["type"] == "package" && r["absent"] != true {
+			out = append(out, r["package"].(string))
+		}
+	}
+	sort.Strings(out)
+	return out
+}
+
+// services are the units the module declares, by unit name.
+func (m manifest) services() map[string]map[string]any {
+	out := map[string]map[string]any{}
+	for _, r := range m.Resources {
+		if r["type"] == "service" {
+			out[r["unit"].(string)] = r
+		}
+	}
+	return out
+}
+
+// holdsTheBundle holds the manifest to the Go bundle this directory builds: every tool registered
+// is listed and nothing else, each named <prefix>_…, and the artifact builds this command.
+func holdsTheBundle(t *testing.T, m manifest, prefix string) {
+	t.Helper()
+	registered := []string{}
+	for _, tool := range tools() {
+		registered = append(registered, tool.Name)
+		if !strings.HasPrefix(tool.Name, prefix+"_") {
+			t.Errorf("tool %s is not named %s_…", tool.Name, prefix)
+		}
+		if tool.Description == "" || tool.Run == nil || tool.Input == nil {
+			t.Errorf("tool %s is not described, runnable and given an input schema", tool.Name)
+		}
+	}
+	if strings.Join(registered, ",") != strings.Join(m.Tools, ",") {
+		t.Errorf("registered %v, listed %v", registered, m.Tools)
+	}
+	if len(m.Build.Artifacts) != 1 {
+		t.Fatalf("one artifact, got %d", len(m.Build.Artifacts))
+	}
+	cwd, _ := os.Getwd()
+	binary := filepath.Base(cwd)
+	a := m.Build.Artifacts[0]
+	want := map[string]any{"kind": "bundle", "language": "go", "system": "arch", "from": "cmd/" + binary, "binary": binary}
+	for k, v := range want {
+		if a[k] != v {
+			t.Errorf("artifact %s = %v, want %v", k, a[k], v)
+		}
+	}
+	if loads, _ := a["loads"].([]any); len(loads) != 1 || loads[0] != binary {
+		t.Errorf("artifact loads %v, want [%s]", a["loads"], binary)
+	}
+	if m.Claims != nil || m.Seats != nil {
+		t.Errorf("claims %v, seats %v: this module holds no seat", m.Claims, m.Seats)
+	}
+}

modules/dmenu/cmd/dmenu-tools/session.go

@@ -0,0 +1,177 @@
+package main
+
+// session.go is the same file in the bundles whose tools act in the operator's graphical session
+// (xclip, dmenu): how a process the node's tool runtime launched reaches that session.
+//
+// The runtime is a system service running as the operator account (novox/hq ADR 0175 §4), in the
+// machine's own mount namespace, and is given no session words: no DISPLAY, no XAUTHORITY. An X
+// server accepts a client that names its display and presents the cookie in the authority file, and
+// both are the account's: the display's socket is in /tmp/.X11-unix, and the cookie file is
+// readable by the account. So the session is found, not configured:
+//
+//  1. the process's own DISPLAY, when the runtime happens to have one;
+//  2. else the DISPLAY and XAUTHORITY of the account's own running processes, read from
+//     /proc/<pid>/environ (the window manager's, by preference), whose socket exists;
+//  3. else the only X socket there is, with the authority file in the account's home.
+//
+// When none is found the tool says that no graphical session of the account is running, and does
+// nothing.
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"sort"
+	"strconv"
+	"strings"
+	"syscall"
+)
+
+// Session is the operator's X session as a tool reaches it.
+type Session struct {
+	Display    string `json:"display"`
+	XAuthority string `json:"xauthority,omitempty"`
+	// FoundBy says how: "environment", "process <pid> (<name>)" or "socket".
+	FoundBy string `json:"found_by"`
+}
+
+// Env is what a command needs to reach the session.
+func (s Session) Env() []string {
+	env := []string{"DISPLAY=" + s.Display}
+	if s.XAuthority != "" {
+		env = append(env, "XAUTHORITY="+s.XAuthority)
+	}
+	return env
+}
+
+// Where the session is looked for. Tests point these at a tree of their own.
+var (
+	procRoot   = "/proc"
+	x11Sockets = "/tmp/.X11-unix"
+	getenv     = os.Getenv
+	myUID      = os.Getuid
+)
+
+// sessionWMs are the programs whose environment is the session's own, preferred over any other
+// process's (a terminal's child may carry a stale or forwarded DISPLAY).
+var sessionWMs = map[string]bool{"i3": true, "sway": true, "xinit": true, "i3bar": true, "picom": true, "dunst": true}
+
+func accountHome() string {
+	if h := strings.TrimSpace(getenv("MESH_OPERATOR_HOME")); h != "" {
+		return h
+	}
+	if h := strings.TrimSpace(getenv("HOME")); h != "" {
+		return h
+	}
+	h, _ := os.UserHomeDir()
+	return h
+}
+
+// socketOf is the local socket of a display such as ":1" or ":1.0", or "" for a remote one.
+func socketOf(display string) string {
+	if !strings.HasPrefix(display, ":") {
+		return ""
+	}
+	n := strings.TrimPrefix(display, ":")
+	if i := strings.IndexByte(n, '.'); i >= 0 {
+		n = n[:i]
+	}
+	if _, err := strconv.Atoi(n); err != nil {
+		return ""
+	}
+	return filepath.Join(x11Sockets, "X"+n)
+}
+
+func exists(p string) bool {
+	_, err := os.Stat(p)
+	return err == nil
+}
+
+// findSession answers the account's X session, or an error saying there is none.
+func findSession() (Session, error) {
+	if d := strings.TrimSpace(getenv("DISPLAY")); d != "" {
+		if s := socketOf(d); s == "" || exists(s) {
+			return Session{Display: d, XAuthority: getenv("XAUTHORITY"), FoundBy: "environment"}, nil
+		}
+	}
+	type seen struct {
+		Session
+		wm    bool
+		count int
+	}
+	found := map[string]*seen{}
+	entries, _ := os.ReadDir(procRoot)
+	for _, e := range entries {
+		pid, err := strconv.Atoi(e.Name())
+		if err != nil || !e.IsDir() {
+			continue
+		}
+		dir := filepath.Join(procRoot, e.Name())
+		info, err := os.Stat(dir)
+		if err != nil {
+			continue
+		}
+		if st, ok := info.Sys().(*syscall.Stat_t); !ok || int(st.Uid) != myUID() {
+			continue
+		}
+		raw, err := os.ReadFile(filepath.Join(dir, "environ"))
+		if err != nil {
+			continue
+		}
+		var display, auth string
+		for _, kv := range strings.Split(string(raw), "\x00") {
+			switch {
+			case strings.HasPrefix(kv, "DISPLAY="):
+				display = strings.TrimPrefix(kv, "DISPLAY=")
+			case strings.HasPrefix(kv, "XAUTHORITY="):
+				auth = strings.TrimPrefix(kv, "XAUTHORITY=")
+			}
+		}
+		if display == "" {
+			continue
+		}
+		if s := socketOf(display); s == "" || !exists(s) {
+			continue
+		}
+		comm, _ := os.ReadFile(filepath.Join(dir, "comm"))
+		name := strings.TrimSpace(string(comm))
+		key := display + "\x00" + auth
+		if found[key] == nil {
+			found[key] = &seen{Session: Session{Display: display, XAuthority: auth, FoundBy: fmt.Sprintf("process %d (%s)", pid, name)}}
+		}
+		f := found[key]
+		f.count++
+		if sessionWMs[name] && !f.wm {
+			f.wm = true
+			f.FoundBy = fmt.Sprintf("process %d (%s)", pid, name)
+		}
+	}
+	if len(found) > 0 {
+		all := make([]*seen, 0, len(found))
+		for _, f := range found {
+			all = append(all, f)
+		}
+		sort.Slice(all, func(i, k int) bool {
+			if all[i].wm != all[k].wm {
+				return all[i].wm
+			}
+			if all[i].count != all[k].count {
+				return all[i].count > all[k].count
+			}
+			return all[i].Display < all[k].Display
+		})
+		return all[0].Session, nil
+	}
+	sockets, _ := filepath.Glob(filepath.Join(x11Sockets, "X*"))
+	if len(sockets) == 1 {
+		s := Session{Display: ":" + strings.TrimPrefix(filepath.Base(sockets[0]), "X"), FoundBy: "socket"}
+		if a := filepath.Join(accountHome(), ".Xauthority"); exists(a) {
+			s.XAuthority = a
+		}
+		return s, nil
+	}
+	if len(sockets) > 1 {
+		return Session{}, fmt.Errorf("no process of this account names its X display, and there are %d X sockets in %s: which one is the operator's session cannot be told", len(sockets), x11Sockets)
+	}
+	return Session{}, fmt.Errorf("no graphical session of this account is running on this machine: no process of the account has DISPLAY set, and there is no X socket in %s. A desktop tool acts only while the operator is logged in to the graphical session", x11Sockets)
+}

modules/dmenu/cmd/dmenu-tools/session_test.go

@@ -0,0 +1,94 @@
+package main
+
+import (
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"testing"
+)
+
+// aMachine gives findSession a /proc and an X socket directory of the test's own.
+func aMachine(t *testing.T, env map[string]string) (proc, sockets string) {
+	t.Helper()
+	root := t.TempDir()
+	proc, sockets = filepath.Join(root, "proc"), filepath.Join(root, "x11")
+	for _, d := range []string{proc, sockets} {
+		if err := os.MkdirAll(d, 0o755); err != nil {
+			t.Fatal(err)
+		}
+	}
+	wasProc, wasX, wasEnv := procRoot, x11Sockets, getenv
+	procRoot, x11Sockets = proc, sockets
+	getenv = func(k string) string { return env[k] }
+	t.Cleanup(func() { procRoot, x11Sockets, getenv = wasProc, wasX, wasEnv })
+	return proc, sockets
+}
+
+func aProcess(t *testing.T, proc string, pid int, comm string, env ...string) {
+	t.Helper()
+	dir := filepath.Join(proc, strconv.Itoa(pid))
+	if err := os.MkdirAll(dir, 0o755); err != nil {
+		t.Fatal(err)
+	}
+	_ = os.WriteFile(filepath.Join(dir, "comm"), []byte(comm+"\n"), 0o644)
+	_ = os.WriteFile(filepath.Join(dir, "environ"), []byte(strings.Join(env, "\x00")+"\x00"), 0o644)
+}
+
+func aSocket(t *testing.T, dir, name string) {
+	t.Helper()
+	if err := os.WriteFile(filepath.Join(dir, name), nil, 0o644); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestSessionTheWindowManagersDisplayAndCookieAreTheSessions(t *testing.T) {
+	proc, sockets := aMachine(t, map[string]string{"MESH_OPERATOR_HOME": "/home/op"})
+	aSocket(t, sockets, "X1")
+	aProcess(t, proc, 3, "bash", "DISPLAY=:9", "XAUTHORITY=/stale")
+	aProcess(t, proc, 4, "kitty", "DISPLAY=:1", "XAUTHORITY=/home/op/.Xauthority")
+	aProcess(t, proc, 5, "i3", "DISPLAY=:1.0", "XAUTHORITY=/home/op/.Xauthority")
+	aProcess(t, proc, 6, "sshd", "PATH=/bin")
+	s, err := findSession()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if s.Display != ":1.0" || s.XAuthority != "/home/op/.Xauthority" || !strings.Contains(s.FoundBy, "i3") {
+		t.Fatalf("%+v: a display without a socket (:9) is skipped, and the window manager's is preferred", s)
+	}
+	if got := strings.Join(s.Env(), " "); got != "DISPLAY=:1.0 XAUTHORITY=/home/op/.Xauthority" {
+		t.Fatalf("env %s", got)
+	}
+}
+
+func TestSessionTheOnlySocketWithTheHomesCookieIsTheFallback(t *testing.T) {
+	home := t.TempDir()
+	_ = os.WriteFile(filepath.Join(home, ".Xauthority"), []byte("c"), 0o600)
+	_, sockets := aMachine(t, map[string]string{"MESH_OPERATOR_HOME": home})
+	aSocket(t, sockets, "X0")
+	s, err := findSession()
+	if err != nil || s.Display != ":0" || s.XAuthority != filepath.Join(home, ".Xauthority") || s.FoundBy != "socket" {
+		t.Fatalf("%+v %v", s, err)
+	}
+}
+
+func TestSessionNoSessionIsSaidNotGuessed(t *testing.T) {
+	_, sockets := aMachine(t, map[string]string{})
+	if _, err := findSession(); err == nil || !strings.Contains(err.Error(), "no graphical session") {
+		t.Fatalf("none: %v", err)
+	}
+	aSocket(t, sockets, "X0")
+	aSocket(t, sockets, "X1")
+	if _, err := findSession(); err == nil || !strings.Contains(err.Error(), "2 X sockets") {
+		t.Fatalf("two: %v", err)
+	}
+}
+
+func TestSessionTheProcessesOwnDisplayComesFirst(t *testing.T) {
+	_, sockets := aMachine(t, map[string]string{"DISPLAY": ":2", "XAUTHORITY": "/a"})
+	aSocket(t, sockets, "X2")
+	s, err := findSession()
+	if err != nil || s.Display != ":2" || s.FoundBy != "environment" {
+		t.Fatalf("%+v %v", s, err)
+	}
+}