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+---
+status: open
+opened: 2026-09-29
+located-in: []
+---
+
+# 147 — the operator's tools still dial the bus that was removed
+
+## What was observed
+
+Every tool call an operator makes against the mesh fails, on every machine, with the same answer:
+
+```
+AMQP not connected — cannot reach hal/mesh@novox
+AMQP not connected — cannot reach hal/mesh@shanks
+```
+
+The mesh moved to one bus and the previous transport was deleted
+([ADR 0131](../../02-DECISIONS/0131-everything-on-the-mesh-speaks-to-the-broker-seat.md), cut over
+2026-09-28). The surface an operator drives the mesh through — the tool bridge their assistant
+speaks to — still opens an AMQP connection, so it cannot reach anything. Not one node answers,
+including the machine the operator is sitting at.
+
+**What that leaves.** The mesh itself is healthy: nodes are current, modules run, the bus carries
+the mesh's own traffic. What is gone is the way a person asks it anything. Every question — what a
+node runs, what is assigned, what a module's settings are — has to be asked by opening a shell on
+the machine and running the control plane's binary inside its container, which is precisely the
+path the tool surface exists to remove, and which nothing checks, records or permits.
+
+It also silently changes how work gets done: an assistant told to use the mesh's tools finds them
+dead, falls back to `ssh` and `docker exec`, and the operator discovers the fallback rather than
+the fault.
+
+## Why this is here and not a note in the knowledge base
+
+The rule is that everything happens over the mesh's bus. A surface that cannot reach that bus is
+that rule enforced by nothing — and the mesh reports itself healthy throughout, because what broke
+is not a module, a node or a provision but the thing standing outside asking them questions.
+
+The same cut-over removed the assistant's long-term memory (`recall`, `memorize`) for the same
+reason, which is why lessons from the last two days were written into this repository by hand.
+
+## What would have prevented it
+
+- **The tool surface as a consumer of the bus like any other**, so moving the bus moves it — rather
+  than a separate bridge with its own connection settings that nothing resolves.
+- **A check that a tool call reaches a node**, run where the mesh's other checks run. Every check
+  the mesh makes today is about the relationship between the mesh and a machine; none asks whether
+  a person can ask it anything ([issue 145](../145-a-machine-reads-healthy-while-its-modules-cannot-reach-each-other/00-report.md),
+  the same shape one level out).
+
+## Evidence to carry into diagnosis
+
+- The failure text names `hal/mesh@<node>`, so the bridge is resolving a node and then dialling the
+  old transport.
+- It fails identically for the local machine, which rules out reachability and points at the
+  transport alone.
+- The mesh's own traffic over the new bus is unaffected: nodes report, declarations apply.