diff --git a/checks/noplacement/main.go b/checks/noplacement/main.go
index e7af4e27..3de240c4 100644
--- a/checks/noplacement/main.go
+++ b/checks/noplacement/main.go
@@ -1,11 +1,13 @@
-// Command noplacement refuses what the repository path of placement left behind (novox/hq ADR 0567 §1, §8, §10).
+// Command noplacement refuses what the repository path of placement left behind (novox/hq ADR 0567 §10, §12).
 //
 // Placement, which module runs on which node, is bus state held by the seat mesh-placement; no file of the
 // catalogue says it, and no manifest reads it from the delivery indexer, which no longer keeps it. It refuses:
 //
 //  1. a `placement` directory (or file) at the root of the catalogue;
 //
-//  2. a manifest naming a state, stream, event or bucket of the indexer's placement (`mesh-delivery-indexer.placement…`
+//  2. a `particulars` file at the root (the mesh's node names come from the checker's run, §16);
+//
+//  3. a manifest naming a state, stream, event or bucket of the indexer's placement (`mesh-delivery-indexer.placement…`
 //     or `mesh-delivery-indexer_placement…`) in any string value, such as `reads`.
 //
 //     go run . <catalogue root>
@@ -29,7 +31,10 @@ var Prefixes = []string{"mesh-delivery-indexer.placement", "mesh-delivery-indexe
 func Findings(root string) ([]string, error) {
 	var out []string
 	if _, err := os.Lstat(filepath.Join(root, "placement")); err == nil {
-		out = append(out, "placement: the repository holds no placement; it is bus state of the seat mesh-placement (novox/hq ADR 0567 §1)")
+		out = append(out, "placement: the repository holds no placement; it is bus state of the seat mesh-placement (novox/hq ADR 0567 §10)")
+	}
+	if _, err := os.Lstat(filepath.Join(root, "particulars")); err == nil {
+		out = append(out, "particulars: the repository lists no node names; the checker hands them to the check (novox/hq ADR 0567 §16)")
 	}
 	manifests, err := filepath.Glob(filepath.Join(root, "modules", "*", "module.json"))
 	if err != nil {
@@ -47,7 +52,7 @@ func Findings(root string) ([]string, error) {
 		}
 		module := filepath.Base(filepath.Dir(file))
 		for _, s := range named(doc, nil) {
-			out = append(out, fmt.Sprintf("%s: names %q, which the indexer no longer keeps; placement is the seat mesh-placement's (novox/hq ADR 0567 §8)", module, s))
+			out = append(out, fmt.Sprintf("%s: names %q, which the indexer no longer keeps; placement is the seat mesh-placement's (novox/hq ADR 0567 §12)", module, s))
 		}
 	}
 	return out, nil
diff --git a/checks/noplacement/main_test.go b/checks/noplacement/main_test.go
index db3caf85..0ffc320f 100644
--- a/checks/noplacement/main_test.go
+++ b/checks/noplacement/main_test.go
@@ -15,6 +15,7 @@ func TestFindingsRefuseWhatThePlacementPathLeft(t *testing.T) {
 	}{
 		{"clean", map[string]string{"modules/a/module.json": `{"module":"a","reads":["mesh-controller.assignments"]}`}, ""},
 		{"a placement directory", map[string]string{"placement/ace.json": `{}`}, "placement: the repository holds no placement"},
+		{"a particulars file", map[string]string{"particulars": "ace\n"}, "particulars: the repository lists no node names"},
 		{"a read of the indexer's placement", map[string]string{"modules/a/module.json": `{"module":"a","reads":["mesh-delivery-indexer.placement"]}`}, `a: names "mesh-delivery-indexer.placement"`},
 		{"a read of its candidates", map[string]string{"modules/b/module.json": `{"module":"b","reads":["mesh-delivery-indexer.placement-candidates"]}`}, "placement-candidates"},
 		{"its event", map[string]string{"modules/c/module.json": `{"module":"c","on":[{"event":"mesh-delivery-indexer.placement-changed"}]}`}, "placement-changed"},
diff --git a/checks/particulars/main.go b/checks/particulars/main.go
index 42525c96..e2f6d32e 100644
--- a/checks/particulars/main.go
+++ b/checks/particulars/main.go
@@ -3,7 +3,7 @@
 // fixture of a covered module names a node of this one.
 //
 // The names are the mesh's own, not the repository's: the checker hands them in the environment value
-// MESH_NODE_NAMES, comma-separated, from the node records it reads (novox/hq ADR 0567 §11). A run with none fails
+// MESH_NODE_NAMES, comma-separated, from the node records it reads (novox/hq ADR 0567 §16). A run with none fails
 // loudly, since it would pass on anything. The modules covered are in `covered` at checks/particulars/covered, one a line. A name is matched
 // whole and in any case; a hyphen, an underscore or a CamelCase boundary parts one, so a longer word holding a name is another word.
 // The forge is not a node name: its host (git.novox.be) and the organisation path (novox/<repo>) are blanked
diff --git a/modules/mesh-build-go/cmd/mesh-build-go/asks_test.go b/modules/mesh-build-go/cmd/mesh-build-go/asks_test.go
index 7759b452..d9efe887 100644
--- a/modules/mesh-build-go/cmd/mesh-build-go/asks_test.go
+++ b/modules/mesh-build-go/cmd/mesh-build-go/asks_test.go
@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"os"
+	"regexp"
 	"slices"
 	"strings"
 	"testing"
@@ -126,7 +127,8 @@ func TestManifestClaimsTheGoBuildSeatAndReadsItsCapacity(t *testing.T) {
 	raw, _ := os.ReadFile(moduleDir + "/module.json")
 	var doc struct {
 		Config map[string]struct {
-			Default json.RawMessage `json:"default"`
+			Default              json.RawMessage `json:"default"`
+			Pattern, Description string
 		} `json:"config"`
 	}
 	_ = json.Unmarshal(raw, &doc)
@@ -144,6 +146,16 @@ func TestManifestClaimsTheGoBuildSeatAndReadsItsCapacity(t *testing.T) {
 	if w, fault := buildstep.NodeBuildHours(moduleDir+"/files/settings.json", "g14", t.Errorf)(); w != nil || fault != "" {
 		t.Errorf("the settings template holds build hours %v (%s)", w, fault)
 	}
+	// ADR 0567 §15: build-hours names no node (one window, or empty for any hour) and capacity defaults to 0.
+	window := regexp.MustCompile("^(?:" + doc.Config[buildstep.BuildHoursSetting].Pattern + ")$")
+	for value, ok := range map[string]bool{"": true, "18:00-06:00": true, "g14=18:00-06:00": false, "18:00": false} {
+		if window.MatchString(value) != ok {
+			t.Errorf("build-hours pattern on %q: accepted %v, want %v", value, !ok, ok)
+		}
+	}
+	if strings.Contains(doc.Config[buildstep.BuildHoursSetting].Description, "=") {
+		t.Errorf("the build-hours description names a node pair")
+	}
 	var capacity float64
 	_ = json.Unmarshal(doc.Config[buildstep.CapacitySetting].Default, &capacity)
 	if capacity != 0 {
diff --git a/modules/mesh-build-go/cmd/mesh-build-go/digest.go b/modules/mesh-build-go/cmd/mesh-build-go/digest.go
index dc6b4858..c3494d08 100644
--- a/modules/mesh-build-go/cmd/mesh-build-go/digest.go
+++ b/modules/mesh-build-go/cmd/mesh-build-go/digest.go
@@ -38,7 +38,7 @@ const DigestVersion = "6"
 const besideVariable = "MESH_CHECK_BESIDE"
 
 // namesVariable is the same for the mesh's node names: a package whose tests reach a file naming it depends on the node
-// list the ask carries, so its digest holds the sorted names and a new node misses a kept verdict (ADR 0567 §12).
+// list the ask carries, so its digest holds the sorted names and a new node misses a kept verdict (ADR 0567 §15).
 const namesVariable = "MESH_NODE_NAMES"
 
 // ReadsOutsideMarker is the name of a file in a package's directory that says its tests read files outside it (a
diff --git a/modules/mesh-build-go/cmd/mesh-build-go/digest_test.go b/modules/mesh-build-go/cmd/mesh-build-go/digest_test.go
index 49d3f9a1..0a449589 100644
--- a/modules/mesh-build-go/cmd/mesh-build-go/digest_test.go
+++ b/modules/mesh-build-go/cmd/mesh-build-go/digest_test.go
@@ -189,7 +189,7 @@ func TestAModuleOutsideTheTreeCountsByVersionAndChecksum(t *testing.T) {
 	if d3 := digest(); d3 == d1 {
 		t.Errorf("a new version left the digest as it was")
 	}
-	// A different node list misses the cache only for a package whose tests read MESH_NODE_NAMES (ADR 0567 §12).
+	// A different node list misses the cache only for a package whose tests read MESH_NODE_NAMES (ADR 0567 §15).
 	names = []string{"node-names a"}
 	d4 := digest()
 	names = []string{"node-names a", "node-names b"}
diff --git a/modules/mesh-build-go/module.json b/modules/mesh-build-go/module.json
index 6c72f508..88fbba9b 100644
--- a/modules/mesh-build-go/module.json
+++ b/modules/mesh-build-go/module.json
@@ -33,7 +33,7 @@
     "build-hours": {
       "type": "string",
       "description": "When this node may take this module's build asks: one window HH:MM-HH:MM in the node's local time (an end before its start crosses midnight, 18:00-06:00). Outside it the node takes no new step and finishes the ones it runs; an empty value builds at any hour. It is set per node in the mesh's configuration.",
-      "pattern": "|[a-z0-9_-]+=([01][0-9]|2[0-3]):[0-5][0-9]-([01][0-9]|2[0-3]):[0-5][0-9](,[a-z0-9_-]+=([01][0-9]|2[0-3]):[0-5][0-9]-([01][0-9]|2[0-3]):[0-5][0-9])*",
+      "pattern": "|([01][0-9]|2[0-3]):[0-5][0-9]-([01][0-9]|2[0-3]):[0-5][0-9]",
       "default": ""
     },
     "cores-per-step": {
diff --git a/modules/mesh-build-image/cmd/mesh-build-image/manifest_test.go b/modules/mesh-build-image/cmd/mesh-build-image/manifest_test.go
index 9b424a22..b6da5a0a 100644
--- a/modules/mesh-build-image/cmd/mesh-build-image/manifest_test.go
+++ b/modules/mesh-build-image/cmd/mesh-build-image/manifest_test.go
@@ -1,8 +1,10 @@
 package main
 
 import (
+	"encoding/json"
 	"os"
 	"path/filepath"
+	"regexp"
 	"slices"
 	"strings"
 	"testing"
@@ -121,6 +123,30 @@ func TestManifestKeepsItsStatesClaimsItsBuildSeatAndDeclaresItsHealthTool(t *tes
 	if strings.TrimSpace(string(tpl)) != "${seat:mesh-artifact-store:reach}" {
 		t.Errorf("registry template = %q", tpl)
 	}
+	raw, _ = os.ReadFile(filepath.Join(moduleDir, "module.json"))
+	var doc struct {
+		Config map[string]struct {
+			Default              json.RawMessage `json:"default"`
+			Pattern, Description string
+		} `json:"config"`
+	}
+	_ = json.Unmarshal(raw, &doc)
+	var capacity float64 = -1
+	_ = json.Unmarshal(doc.Config["capacity"].Default, &capacity)
+	if capacity != 0 {
+		t.Errorf("the capacity's default = %g, want 0", capacity)
+	}
+	// ADR 0567 §15: build-hours names no node (one window, or empty for any hour) and capacity defaults to 0.
+	window := regexp.MustCompile("^(?:" + doc.Config["build-hours"].Pattern + ")$")
+	for value, ok := range map[string]bool{"": true, "18:00-06:00": true, "g14=18:00-06:00": false, "18:00": false} {
+		if window.MatchString(value) != ok {
+			t.Errorf("build-hours pattern on %q: accepted %v, want %v", value, !ok, ok)
+		}
+	}
+	if strings.Contains(doc.Config["build-hours"].Description, "=") {
+		t.Errorf("the build-hours description names a node pair")
+	}
+
 }
 
 // Every tool the manifest names is served, and every tool served is named.
diff --git a/modules/mesh-build-image/module.json b/modules/mesh-build-image/module.json
index 3e5321ff..54bc2fb0 100644
--- a/modules/mesh-build-image/module.json
+++ b/modules/mesh-build-image/module.json
@@ -28,7 +28,7 @@
     "build-hours": {
       "type": "string",
       "description": "When this node may take this module's build asks: one window HH:MM-HH:MM in the node's local time (an end before its start crosses midnight, 18:00-06:00). Outside it the node takes no new step and finishes the ones it runs; an empty value builds at any hour. It is set per node in the mesh's configuration.",
-      "pattern": "|[a-z0-9_-]+=([01][0-9]|2[0-3]):[0-5][0-9]-([01][0-9]|2[0-3]):[0-5][0-9](,[a-z0-9_-]+=([01][0-9]|2[0-3]):[0-5][0-9]-([01][0-9]|2[0-3]):[0-5][0-9])*",
+      "pattern": "|([01][0-9]|2[0-3]):[0-5][0-9]-([01][0-9]|2[0-3]):[0-5][0-9]",
       "default": ""
     },
     "cores-per-step": {
diff --git a/modules/mesh-build-node/cmd/mesh-build-node/asks_test.go b/modules/mesh-build-node/cmd/mesh-build-node/asks_test.go
index 5a2f0172..75a03f2e 100644
--- a/modules/mesh-build-node/cmd/mesh-build-node/asks_test.go
+++ b/modules/mesh-build-node/cmd/mesh-build-node/asks_test.go
@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"os"
+	"regexp"
 	"strings"
 	"testing"
 	"time"
@@ -84,7 +85,8 @@ func TestManifestTakesTheBuildCapacity(t *testing.T) {
 	raw, _ := os.ReadFile(moduleDir + "/module.json")
 	var doc struct {
 		Config map[string]struct {
-			Default json.RawMessage `json:"default"`
+			Default              json.RawMessage `json:"default"`
+			Pattern, Description string
 		} `json:"config"`
 	}
 	_ = json.Unmarshal(raw, &doc)
@@ -102,6 +104,16 @@ func TestManifestTakesTheBuildCapacity(t *testing.T) {
 	if w, fault := buildstep.NodeBuildHours(moduleDir+"/files/settings.json", "g14", t.Errorf)(); w != nil || fault != "" {
 		t.Errorf("the settings template holds build hours %v (%s)", w, fault)
 	}
+	// ADR 0567 §15: build-hours names no node (one window, or empty for any hour) and capacity defaults to 0.
+	window := regexp.MustCompile("^(?:" + doc.Config[buildstep.BuildHoursSetting].Pattern + ")$")
+	for value, ok := range map[string]bool{"": true, "18:00-06:00": true, "g14=18:00-06:00": false, "18:00": false} {
+		if window.MatchString(value) != ok {
+			t.Errorf("build-hours pattern on %q: accepted %v, want %v", value, !ok, ok)
+		}
+	}
+	if strings.Contains(doc.Config[buildstep.BuildHoursSetting].Description, "=") {
+		t.Errorf("the build-hours description names a node pair")
+	}
 	var capacity float64
 	_ = json.Unmarshal(doc.Config[buildstep.CapacitySetting].Default, &capacity)
 	if capacity != 0 {
diff --git a/modules/mesh-build-node/module.json b/modules/mesh-build-node/module.json
index bbd38287..25f8611b 100644
--- a/modules/mesh-build-node/module.json
+++ b/modules/mesh-build-node/module.json
@@ -29,7 +29,7 @@
     "build-hours": {
       "type": "string",
       "description": "When this node may take this module's build asks: one window HH:MM-HH:MM in the node's local time (an end before its start crosses midnight, 18:00-06:00). Outside it the node takes no new step and finishes the ones it runs; an empty value builds at any hour. It is set per node in the mesh's configuration.",
-      "pattern": "|[a-z0-9_-]+=([01][0-9]|2[0-3]):[0-5][0-9]-([01][0-9]|2[0-3]):[0-5][0-9](,[a-z0-9_-]+=([01][0-9]|2[0-3]):[0-5][0-9]-([01][0-9]|2[0-3]):[0-5][0-9])*",
+      "pattern": "|([01][0-9]|2[0-3]):[0-5][0-9]-([01][0-9]|2[0-3]):[0-5][0-9]",
       "default": ""
     },
     "cores-per-step": {