diff --git a/CLAUDE.md b/CLAUDE.md
index ebc36834..79ddf0f2 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -332,6 +332,24 @@ link-focusable). Half the app still does this; none of the new code should.
   re-exported from `src/workspaces/officerdev/src/index.ts` (named exports only — the barrel
   deliberately avoids `export *` for app modules to keep `appRegistryMetas` from colliding).
 
+## Before you start: check COMMS
+
+`COMMS/<work-stream>/` is a **tracked** channel between the agents working on this repo — several run on
+different machines, and findings used to reach each other by the owner relaying them from memory at the end of
+long sessions.
+
+**If your task touches a work stream with a directory there, read its files first.** They carry what is
+verified, what is merely assumed, what is known broken, and what is waiting on a decision. Newest date wins;
+each directory's `README.md` states the convention.
+
+Current channels:
+
+- `COMMS/sidecar-app-store/` — the app store, per-user Linux accounts, per-user Docker, and the per-user
+  Claude work that follows from them. Paired with `docs/per-user-linux-accounts.md`, which holds the durable
+  reasoning; the handoffs hold the coordination.
+
+Write there instead of asking the owner to pass something along, and delete a handoff once it is spent.
+
 ## Further Reading
 
 - `docs/navigation-audit.md` — **authoritative** on routing/navigation: the opaque-click anti-pattern,