Regression from my own B7 change, reported within the hour: turns collapsing to "turn
completed without output" and coming back only on refresh.
B7 stopped resume-cursor defaulting an unidentified session to claude-code. Correct for the
durable cut-off row, wrong for adoption: useChat sends model only if modelRef.current is
set, so a reconnect without one is routine, not exotic. Declining to adopt left the socket
unbound to the live session, so the running turn output went nowhere — and a refresh looked
like a fix because it rebuilds from the durable log.
Adoption is about DELIVERY and must be generous; only the durable write needs certainty. So
adopt on the default again, mark it as an assumption, and skip the cut-off check on it.
That keeps B7 fixed — no false "agent went away" written against an opencode session — with
no unbound sockets.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
B7. `msg.model || DEFAULT_MODEL` declared every session without an explicit model to be
claude-code, and the parity doc recorded only the visible half of what that cost.
The durable false cut-off is real: endTurnIfAgentIsGone asked the claude sidecar about a
key it had never held, was told false, and wrote "the agent went away" into a turn that
was running fine. It survives reload, because surviving reload is what that row is for.
The same default also handed the session to adoptOrphanedSession as a claude one, which
subscribes it to that sidecar bus and pins session.model — so an opencode turn output
never arrived, and stopping it called killClaude on a key that sidecar never had. A stop
button that silently does nothing.
decideResume makes both rules explicit: the server record beats the client claim, and an
unknown harness stays unknown — no adoption, no cut-off check, just the replay. Silence
is the safe failure when the wrong answer is written durably.
DEFAULT_MODEL stays in handleAttach and is now commented as to why: that path reached its
sessionId by asking the claude sidecar to resolve a claudeSessionId, so only claude could
have answered.
First test in api/chat, which had none. websocket.ts has no seam to drive the handler
through, so the decision is extracted and tested; the wiring around it is not covered.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
pastilhasandClaude Opus 5