Officer's hour-long idle timer was doing two unrelated jobs: collecting its own in-memory binding, which
is its business, and terminating the agent, which is the sidecar's. It could not do the first without
the second, because `unsub` was a closure reachable only through `kill`.
So a browser that went away killed a live agent an hour later — including one the sidecar had
deliberately protected. The sidecar already refuses to collect a session that is mid-turn or holding
background tasks: `task:started` disarms its idle GC, and `armIdle` re-checks and re-arms rather than
firing once. Officer had no view of any of that. A laptop running out of battery overnight took a
`run_in_background` job with it for no reason.
`detach` now sits beside `kill` on both streaming handles, and `_sidecarUnsub` — declared and called for
a long time, never once assigned — is populated at all three sites. `releaseSession` unsubscribes and
forgets the record without killing; the idle timer points at it. `deleteSession` is unchanged, so an
explicit disconnect still ends the session.
The third assignment site was not in the plan: `adoptOrphanedSession` sets `_claudeKill` but nothing
else, so an adopted session that later idled out would have dropped its record while the listener stayed
subscribed — a leak of one per adopt-then-leave.
No double subscription: releasing unsubscribes first, so a returning browser either adopts with a fresh
listener or starts a first turn with none behind it.
Step 1 of docs/chat-session-lifetime.md. Step 2 (a list verb, so running sessions can be found after a
restart) is still open.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
pastilhasandClaude Opus 5
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