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fix(server): a Claude wake folded into a queued prompt no longer hangs - #34
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When a background task finished while the thread was idle, Claude opened its own wake turn and the adapter buffered its `init`, queueing a wake run. If a queued prompt started in the same moment, Claude answered it inside that wake turn (or ran the wake turn first), so the turn's result went to the prompt's run. The wake run then drained the stale `init` and waited for output that had already been delivered, staying "running" until the next message. Drop the buffered wake-turn frames once a result ends that turn inside an attached prompt turn, so the wake run settles as soon as it starts. Co-Authored-By: Claude Opus 5.5 <[email protected]>
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| const messages = entry.messages.filter( | ||
| (m, index) => | ||
| index < lastResult || | ||
| !( | ||
| isClaudeTurnStartMessage(m) || | ||
| ((m.type === "assistant" || m.type === "user") && | ||
| parentToolUseIdFromSdkMessage(m) === null) | ||
| ), |
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When the wake was triggered by a background subagent rather than an opaque command, this filter leaves the subagent's task_notification in the buffer while removing its init and root output. The queued continuation then replays that notification but has neither a result nor a native wake frame; the only notification-only completion path at lines 8951-8953 requires an opaque-task tombstone, which subagent notifications do not have, so the continuation still remains running indefinitely. Preserve an explicit ended-wake marker or otherwise settle this notification-only subagent drain.
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Valid: a subagent wake left only its task_notification in the buffer, and only an opaque-task tombstone settled a notification-only drain. Fixed in 1c57fbf: endBufferedWakeTurn now marks the buffer entry wakeTurnEnded, and the wake run settles after replaying what is left, for either task kind. A frame buffered afterwards rebuilds the entry and drops the mark. The folded-prompt test now runs for both a command and a subagent wake; the subagent case fails without the fix.
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Review comments at
@apps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.ts:
- Around line 3742-3744: Update the continuation handling around
isClaudeTurnStartMessage and parentToolUseIdFromSdkMessage to retain whether a
buffered subagent wake result was consumed; use that state in startTurn to
settle notification-only replay for both subagent and opaque-task notifications,
and add a subagent case alongside the opaque-task tests.
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apps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.test.tsapps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.ts
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A subagent's wake leaves its task_notification in the buffer for the wake run to replay, and only an opaque command's notification settled a drain with no result or wake frame. Mark the buffer when its wake turn ended inside a prompt turn, so the wake run settles after replay for either task kind. A frame buffered later drops the mark. Co-Authored-By: Claude Opus 5.5 <[email protected]>
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| ); | ||
| const next = new Map(current); | ||
| if (messages.length === 0) next.delete(nativeThreadId); | ||
| else next.set(nativeThreadId, { ...entry, messages, wakeTurnEnded: true }); |
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When the original wake belongs to a subagent, a nested-subagent task_notification or idle rate_limit_event arriving after this marker is set but before the continuation drains causes bufferWakeMessage to reconstruct the entry with only messages and detail, clearing wakeTurnEnded. Neither frame starts a new root wake or guarantees a later result, and the already-requested continuation then drains notification-only data without an opaque tombstone or native wake frame and remains running indefinitely. The fresh evidence in this patch is that the new marker assigned here is intentionally discarded by the existing generic buffer append; preserve it for frames that cannot begin another root wake.
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| ); | ||
| yield* Queue.offer(harness.sdkMessages, task.started); | ||
| yield* Queue.offer(harness.sdkMessages, turnOneResult); | ||
| yield* awaitUntil(() => harness.terminalEvents().length === 1, "first turn terminal"); |
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These new backend tests repeatedly call awaitUntil, whose implementation polls for up to 5,000 scheduler yields; a busy or differently scheduled run can exhaust that arbitrary attempt count even when the behavior is correct. Await the specific terminal event or a Deferred completed by the harness instead, as required for event-sourced server tests.
AGENTS.md reference: AGENTS.md:L103-L103
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Merges upstream nightly v0.1.7-nightly.20261104.4151 (322f654). Adaptations: - selfUpdate: the managed-policy update mirror picks the release base URL; the fork's host update command and its availability polling stay. - ws: withLateConfigDiscovery takes upstream's directEndpoints as its fifth parameter and the fork's availableUpdateVersions stream as its sixth, and merges both late streams. - pullRequestWatch: keeps the fork's thumbs-up news alongside upstream's rule that a conflict a push did not resolve is news for the new head. - timestampFormat: keeps the fork's time-of-day label helpers next to upstream's time-zone-aware numeric dates; both test suites kept. - ClaudeAdapterV2: drops the fork's endBufferedWakeTurn/wakeTurnEnded (#34). Upstream's absorbed-wake fix (pingdotgg#28010) settles the same folded-prompt, folded-subagent, and wake-first runs; the fork's tests for them pass without the fork mechanism and stay. - PullRequestWatchReactor: wake message ids come from SecureRandom, since upstream replaced the crypto service. - Fork tests: ClaudeAdapterV2 and runtimeLayer cases provide NodeCrypto, and the Codex process-exit case mocks PortDiscovery, which the client factory now requires. Co-Authored-By: Claude Opus 5.5 <[email protected]>
Summary
A Claude thread could sit "running" for hours on a background-task wake run that nothing would ever answer. It happens when a background task finishes while the thread is idle and a queued prompt (here a PR-watch update) starts in the same second. Claude opens its own wake turn first, so the adapter buffers its
initand queues a wake run. Claude then answers the prompt inside that wake turn, or runs the wake turn just before the prompt's, and the turn's result goes to the prompt's run. When the wake run started, it drained the staleinitand waited for a result that had already gone to the prompt's run.The two call sites are in
ClaudeAdapterV2.ts: the accepted task-notification result, and the result-for-another-turn branch. A bufferedresultstill closes its own turn on replay, so frames before the last buffered result are kept.Seen live on CLI 2.1.301 (
origin: task-notificationplususer_message_uuids: [prompt]on a single result). The existingclaude_background_wake_before_queued_promptfixture (CLI 2.1.281) never buffered theinit, so it did not hit this.Evidence
Timed out waiting for wake run terminal.After: all pass. Also
ClaudeAdapterV2.test.ts266/266 apart frommoves the root's foreground subagents … (never answers), which times out intermittently ondev_vmtoo,OrchestratorReplayFixtures.integration.test.ts140/140, server typecheck, lint, and fmt pass.Merge Danger
Door: two-way
Blast Radius: narrow
Claude adapter only. The change touches only wake-buffer frames that come after the last buffered result, and only when a result has just ended that wake turn inside a prompt turn. Worst case: a couple of wake output frames that arrived before the prompt turn attached are not rendered. Claude's
initnormally comes seconds before any output.Model: Claude Opus 5.5, via Claude Code in T3 Code.
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