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+---
+layer: to-be
+status: designed
+code: []
+updated: 2026-08-30
+decisions:
+  - 02-DECISIONS/0008-a-context-owns-its-store.md
+  - 02-DECISIONS/0001-mesh-brokers-nodes-host-agents-think.md
+---
+
+# A board
+
+**A place to see the mesh.** Read from a survey of the one that exists, so what is proposed here
+is a shorter list than what is there, deliberately.
+
+## What the existing board does, and what of it belongs here
+
+Eight sections. Four are about work and workers and are held back with the rest of that domain;
+the other four are about the mesh itself.
+
+| | what it shows | where it stands here |
+|---|---|---|
+| **the mesh** | every node, what each runs, what each takes from another, module versions | **everything behind it exists** — it is a reader, not a second source |
+| **builds** | a build, its stages, its log | needs the builder |
+| **sessions** | model sessions, their usage, and switching between accounts | [ADR 0024](../../02-DECISIONS/0024-model-access-is-a-provision.md) |
+| **channels** | nodes messaging each other | the agent layer |
+
+## The constraint that matters, and it is not a feature
+
+**The existing board is one service that reads every context's database.** It joins nodes to
+provisions to modules to sessions by querying each store directly, because that is the shortest
+path to a page that shows all of them at once.
+
+That is [ADR 0008](../../02-DECISIONS/0008-a-context-owns-its-store.md) violated by the one
+component with a reason to violate it, and the cost is not hypothetical — it is the same cost the
+shared library has: **a boundary nothing may cross is a boundary that can move; one thing crossing
+it is enough to freeze it.** A board that reads the provisioning tables directly is a board that
+breaks when provisioning changes its tables, and the change then gets weighed against the board.
+
+**So a board reads through interfaces and holds nothing.** Everything on the mesh page above is
+already answerable by asking the control plane — what nodes exist, what each resolves to, what it
+takes from elsewhere, which module came from which commit. A board that asks those questions is a
+client. A board that queries `inventory` is a second control plane with a worse contract.
+
+**It stores nothing of its own.** No cache that can disagree, no table of "what the mesh looked
+like last time". If a question is slow to answer, the answer belongs in the context that owns it,
+where everything else asking gets it too.
+
+## What it is not
+
+- **Not the way to change things.** Reading is the whole of it to begin with. Every action the
+  board could offer already exists as a command, and a button that does something no command does
+  is a second implementation of a decision.
+- **Not a dashboard of graphs.** What a person needs from a mesh is *which machine is not doing
+  what it was told*, and that is a list, not a chart.