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fix(server): Stop returns an unread Claude steer to the queue - #15880
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A Claude steer sent while a foreground command runs waits in Claude Code's own queue. Stop closed the Claude process with the steer still there, so it was lost while the thread showed it as delivered. Steers now carry a uuid, and Claude Code's interrupt receipt names the prompts it still held unread. The thread moves each of those steers into a queued run of its own, held when the Stop held the queue, where the user can resume, edit or remove it.
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| attempt.status !== "running" | ||
| ) { | ||
| return; | ||
| return result ? result.unreadSteerMessageIds : []; |
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🟡 Medium orchestration-v2/ProviderTurnControlService.ts:242
When projection terminalization exceeds the 1,000-iteration wait, interruptAndAwaitTerminal throws after interruptTurn has returned unreadSteerMessageIds, so EffectWorker never calls thread.unread-steers.requeue; the retry then takes the settled/no-session path and returns [], permanently dropping those steer messages. Persist or requeue the IDs before the terminalization wait, independently of whether that wait succeeds.
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In file @apps/server/src/orchestration-v2/ProviderTurnControlService.ts around line 242:
When projection terminalization exceeds the 1,000-iteration wait, `interruptAndAwaitTerminal` throws after `interruptTurn` has returned `unreadSteerMessageIds`, so `EffectWorker` never calls `thread.unread-steers.requeue`; the retry then takes the settled/no-session path and returns `[]`, permanently dropping those steer messages. Persist or requeue the IDs before the terminalization wait, independently of whether that wait succeeds.
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A known limit, left as is. If the projection wait times out, the restart itself fails and retries. Claude's query is already closed then, so the retry cannot get the receipt again, and the steer is lost as it was before this PR. Requeueing before the wait would mean splitting interruptAndAwaitTerminal or giving the control service a way to dispatch commands, for a timeout that already means the restart went wrong. I noted the limit in the PR description.
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| providerTurnId: effect.request.providerTurnId, | ||
| }) | ||
| .pipe( | ||
| Effect.flatMap((unread) => requeueUnreadSteers(effect, unread, holdQueue)), |
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🟡 Medium orchestration-v2/EffectWorker.ts:193
When thread.unread-steers.requeue fails after interrupt() returns, the recovered steer is permanently stranded: retrying the outbox effect calls Claude's interrupt again, which returns no unread IDs (or an inactive-turn error), so the message remains marked as a steer but is never delivered. Persist the unread IDs before or with the interrupt effect, or make the requeue independently retryable.
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In file @apps/server/src/orchestration-v2/EffectWorker.ts around line 193:
When `thread.unread-steers.requeue` fails after `interrupt()` returns, the recovered steer is permanently stranded: retrying the outbox effect calls Claude's interrupt again, which returns no unread IDs (or an inactive-turn error), so the message remains marked as a steer but is never delivered. Persist the unread IDs before or with the interrupt effect, or make the requeue independently retryable.
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A known limit, left as is. The unread ids exist only in memory between Claude's interrupt receipt and the requeue commit, so a failure there loses the steer, which is what happened to every such steer before this PR. The requeue fails only when the write to the thread's own event store fails, and persisting the receipt first would need the same kind of write. Other effects that dispatch after a provider call have the same shape: the steer effect writes notification.delivery.accept after the provider took the steer, and if that write fails, the retry offers the steer again. I noted the limit in the PR description.
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| const queueHeld = | ||
| queuedRuns.length > 0 | ||
| ? queuedRuns.some((run) => run.queueHeld === true) | ||
| : command.holdQueue; |
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🟡 Medium orchestration-v2/Orchestrator.ts:8070
When Stop is held and no other runs are queued, a Resume before the interrupt receipt is lost, so this fallback uses command.holdQueue and requeues the steer with queueHeld: true; the steer remains held until a second Resume. Determine the current queue-held state from persisted thread metadata (or otherwise propagate the Resume state) instead of falling back to the stale Stop command.
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In file @apps/server/src/orchestration-v2/Orchestrator.ts around line 8070:
When Stop is held and no other runs are queued, a Resume before the interrupt receipt is lost, so this fallback uses `command.holdQueue` and requeues the steer with `queueHeld: true`; the steer remains held until a second Resume. Determine the current queue-held state from persisted thread metadata (or otherwise propagate the Resume state) instead of falling back to the stale Stop command.
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Leaving this as is. No client sends queue.resume while the queue is empty: web and mobile offer Resume queue only while held queued runs exist, and the MCP queue tools have no resume. When other runs are queued, the requeue takes their current state (line 8067), so a Resume that released them releases the steer too.
When none are, the only Resume a user can press before the steer comes back is the web's continue for the interrupted run. That starts a new turn and does not release a held queue, so the steer waiting held behind it is what the Stop asked for, and Resume queue shows for it. Remembering a release aimed at an empty queue would need a hold flag on the thread, for the moment between the run ending and the requeue landing.
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ApprovabilityVerdict: Not approved Macroscope's review found this PR not approvable — This change modifies the existing Stop/interrupt lifecycle across Claude integration, durable effects, and orchestration, adding nontrivial queued-run recovery and retry semantics rather than a small isolated fix. Unresolved edge cases remain around retries, terminalization timeouts, and queue-hold state, so the production behavior warrants human review. Not approved because:
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Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 4 remain after this review. 📝 WalkthroughWalkthroughThe Claude adapter now reports steer messages that remain unread when an interrupt ends a turn. The orchestration flow requeues eligible messages, respects queue-held state, and can start the next queued run. The composer documentation and held-queue label also change. ChangesUnread steer recovery
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Bug fix · Severity of issue fixed: Medium Sequence Diagram(s)sequenceDiagram
participant ClaudeAdapterV2
participant ProviderTurnControlServiceV2
participant EffectWorker
participant Orchestrator
ClaudeAdapterV2->>ProviderTurnControlServiceV2: Return unread steer message IDs
ProviderTurnControlServiceV2->>EffectWorker: Return IDs after interrupt
EffectWorker->>Orchestrator: Dispatch requeue command with holdQueue
Orchestrator->>Orchestrator: Create queued runs and try to start the next run
Suggested reviewers: Merge Risk: 🟡 Moderate · up to Unread steers can still be lost if requeue dispatch fails after Stop or restart, so the recovery guarantee depends on that dispatch succeeding before the effect is acknowledged. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to Recovery remains scoped to the original thread and adds no client-accessible command. However, a failed queue update after the provider stops can still lose unread messages and can block the replacement turn from starting. Retained concerns
Security review detailsSecurity Blast Radius
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Hardening Proposals
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Review comments at @apps/server/src/orchestration-v2/EffectWorker.ts:
- Line 193: Update the flow around requeueUnreadSteers in EffectWorker so unread
IDs are durably preserved before retrying the interrupt effect. Ensure a failed
threads.dispatch retries the requeue using the original unread IDs rather than
relying on a later Stop receipt or terminal-turn result; avoid repeating the
interrupt as part of that retry.
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apps/mobile/src/features/threads/ThreadQueueControl.tsxapps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.test.tsapps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.tsapps/server/src/orchestration-v2/EffectOutbox.tsapps/server/src/orchestration-v2/EffectWorker.test.tsapps/server/src/orchestration-v2/EffectWorker.tsapps/server/src/orchestration-v2/Orchestrator.tsapps/server/src/orchestration-v2/ProviderAdapter.tsapps/server/src/orchestration-v2/ProviderTurnControlService.tsapps/server/src/orchestration-v2/SteeringCompletion.integration.test.tsdocs/user/composer.mdpackages/contracts/src/orchestrationV2.ts
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A retried thread.unread-steers.requeue returned the stored events without starting the queue, unlike queue.resume. A requeue that the Stop did not hold could then wait until the next run ended.
A steer offered twice into one turn has the same uuid both times, so the interrupt receipt can list it twice. The requeue planned each entry against the same projection and queued the message twice.
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Fixes #15708.
Problem
With Follow-up behavior set to Steer, a Claude steer sent while the agent runs a foreground command waits in Claude Code's own queue until the command returns. Stop closed the Claude process with the steer still in that queue. The thread kept showing it as steered, but Claude never read it, and the next turn did not know about it.
Change
query.interrupt()with a receipt whosestill_queuedlists the prompts it still held unread. The Claude adapter maps those uuids back to the steers' message ids and returns them frominterruptTurn.thread.unread-steers.requeue. The orchestrator moves each steer into a queued run of its own at the back of the queue. Its transcript row stays where it was and shows as queued, as when a message is dispatched again into the queue. From there the user can resume, edit, reorder or remove it.t3_thread_interrupt, or a steer that restarts the turn) lets it run next like any queued message. If the user resumed the queue before the steer came back, it follows the queue's current state.queuedRunRecords, shared with the existing queue path ofmessage.dispatch(same fields, same order).docs/user/composer.mdsays that Stop holds the queue and that an unread Claude steer returns to it.Not changed
clear_pendingin Codex core). It needs its own way to report that, so it is left for a follow-up.Relation to #15720 (#15868, #15799)
Both PRs for #15720 make a user's steer interrupt a running command, so in this issue's scenario the steer is read at once and nothing is left unread when Stop comes. They keep the old offer for steers sent by agents and scheduled tasks (#15799 also while a foreground subagent runs), and fall back to it when the interrupt fails. Those steers still wait in Claude's queue, and Stop still loses them. This PR covers them. The changes are independent; whichever lands second needs a small rebase in
steerTurn.Scope and approval
Triaged bug: #15708 (
bug,via-triage). The triage comment lists giving steers a uuid so the adapter can tell whether Claude read one, and returning an unread steer to the composer or the queue on Stop. This PR does both. The triage leaves the fix direction to a maintainer.Verification
ClaudeAdapterV2.test.ts:interruptTurnreturns exactly the steers the interrupt receipt lists as still queued, and ignores uuids it did not offer.SteeringCompletion.integration.test.ts, with Stop holding the queue and without: the unread steer moves to a new queued run and its row shows as queued. Held, it waits untilqueue.resume. It is then delivered as the next turn with the same message id and text. Both cases fail on main.apps/server(queue order, steering, restart continuation, delegated completion, provider switch, recovery, replay fixtures), rebased on a1d9d72: 497 tests pass. They were run withCLAUDE_CONFIG_DIRunset; with it set,claude_result_is_errorfails, as on main. Typecheck ofapps/serverandpackages/contractspasses.claude-sonnet-5-5, the issue's repro script against an isolated server: on main the follow-up answeredNO_CODEWORD. With this fix, the interrupt receipt listed the steer's uuid, the steer came back held, and after Resume the follow-up answeredCODEWORD=…. The control run without Stop still answers with the codeword.Before / after (iOS Simulator, English, two isolated servers that each hold only a demo project, Claude Code 2.1.289, Sonnet 5.5). Claude runs a
curlthat waits on a held local endpoint. A steer gives it a codeword, then Stop, then a follow-up asks for the codeword. Left, main: the steer keeps itssteerbadge and Claude answersNO_CODEWORD. Middle and right, this fix: after Stop the steer shows asqueuedwith "1 queued". After Resume queue, Claude reads it, and the follow-up answersCODEWORD=PELICAN-7. Waits are sped up and marked in the corner.Video: https://github.com/nekohasekai/t3code/releases/download/pr-evidence-unread-steer-requeue-20261005/steer-stop-before-after.mp4
The recording was made before the label change above, so its queue sheet still reads "Queue held after restart".
Prepared with Claude Opus 5.5 in T3 Code (Claude Code harness).