fix(server): restarts keep delegated tasks, queued threads, and stops intact

[maria-rcks]

with "continue threads after restarts" enabled, restart recovery could report a delegated child's interrupted result as final, lose background-work notes, run queued work too early, or continue work the user had stopped.

• recover delegations after reconciliation. hold child results until restart continuations settle, re-offer interrupted completion deliveries, and propagate failed pending-result reads rather than acknowledging them.
• preserve stop intent, held queues and interrupted control commands. activate scheduled work after recovery. retain cancellation notes until a provider turn completes, including an earlier attempt replaced by a steer.
• use execution order rather than run ordinal for resumed runs, including task_status terminal summaries. retain each provider thread's background-work owner and select those owners once, not once per historical run.
• capture shutdown intent before process-group signals let provider exits overwrite recoverable state.

verification

blacksmith: server typecheck and targeted lint passed; 85 focused orchestration/mcp tests passed, followed by 44 projection/recovery tests and both recovery benchmark tests after the query change, then 43 note/continuation/provider-start tests after the attempt-delivery fix. existing tests cover repeated restarts, failed continuations, interrupted deliveries, per-provider ownership, queue ordering and explicit stops.

the real web client and codex provider were exercised through a process-group SIGTERM and restart. the child's interrupted run was cancelled, its linked restart continuation completed, the parent received the final result, and its task_status call returned completed with latestTerminalStatus: completed. the complete flow and this capture were repeated on final head ad0bf37ff4. no web, desktop-shell or mobile UI code changed.

recovery benchmark

same blacksmith worker, same seeded workload and in-memory sqlite. target baseline 70e5a40c20 versus candidate b8c3d46ead, milliseconds. each row is one measurement, not a statistical estimate. the baseline's candidate-count expectation was adjusted for its older held-queue selection; the timed matrix passed. candidate correctness and idempotence checks passed unchanged. disk/fsync costs are not measured.

settled / active threads	selection, baseline → candidate	crash recovery, baseline → candidate	second recovery, baseline → candidate
5,000 / 10	0.7 → 1.1	87.7 → 73.1	33.4 → 2.5
5,000 / 100	1.0 → 1.4	242.5 → 208.3	61.3 → 17.3
5,000 / 1,000	4.0 → 4.6	2,121.7 → 2,113.4	752.7 → 617.1
50,000 / 10	4.9 → 10.1	621.0 → 500.6	308.2 → 9.1
50,000 / 100	5.1 → 10.4	929.2 → 699.6	460.8 → 27.3
50,000 / 1,000	8.5 → 14.0	3,787.9 → 3,077.0	2,080.5 → 609.2

at 50,000 settled / 1,000 active threads, crash recovery decreased 18.8% and repeat recovery decreased 70.7%; candidate selection itself increased 5.5ms. these measurements include the intentional reduction in recovery candidates when queues are held.

the final SQL fix was also measured against the preceding PR head (37f5e915dc), using the actual selection queries, matching sqlite indexes, one pending roster and identical returned rows. 2,000 / 5,000 / 10,000 runs took 568.59 / 3,732.02 / 14,631.07ms before and 0.69 / 1.44 / 2.71ms after. this isolates query scaling, not whole-server restart latency.

two servers sharing one database remain out of scope; preventing that requires a single-instance lock.

implementation: opus 5.5 (high) via claude code and gpt-6-astra (high) via pi in t3 code. both independent gpt-6-astra (xhigh) reviewers approved final head ad0bf37ff4. github checks passed and all review threads were resolved.

[macroscopeapp]

Approvability

Verdict: Not approved

Macroscope's review found this PR not approvable — This PR substantially changes production restart, queue, scheduling, provider-session, and delegated-task recovery semantics across shared orchestration infrastructure. The new startup recovery workflow and work-gating behavior have a broad lifecycle blast radius that warrants human review.

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📒 Files selected for processing (5)

• apps/server/src/orchestration-v2/ProjectionStore.ts
• apps/server/src/orchestration-v2/ProviderTurnStartService.ts
• apps/server/src/orchestration-v2/RestartBackgroundNote.test.ts
• apps/server/src/orchestration-v2/RestartBackgroundNote.ts
• apps/server/src/orchestration-v2/RestartContinuation.ts

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📝 Walkthrough

Walkthrough

This change updates restart recovery, continuation handling, delegated-task reconciliation, and scheduler activation. Run selection now uses completion-aware ordering. Delegated child work can remain pending during continuation recovery, and startup recovers delegated tasks before starting the effect worker.

Changes

Restart and delegated-task recovery

Layer / File(s)	Summary
Recovery candidates and provider shutdown packages/shared/src/orchestrationV2ThreadError.ts, apps/server/src/orchestration-v2/ProjectionStore.ts, apps/server/src/orchestration-v2/ProjectionRecovery.test.ts, apps/server/src/orchestration-v2/ProjectionStore.test.ts, apps/server/src/orchestration-v2/ProviderRuntimeRecoveryService.ts, apps/server/src/orchestration-v2/ProviderRuntimeRecoveryService.test.ts, apps/server/src/orchestration-v2/ProviderRuntimeRecoveryPerformance.test.ts, apps/server/src/orchestration-v2/ProviderSessionManager.ts	Run ordering uses completion timestamps, with ordinal tie-breaking. Runtime recovery excludes held queued runs and retains relevant run history for provider threads with pending background tasks. Provider recovery leaves app-owned delegated tasks open, isolates per-thread continuation-preparation failures, and tracks shutdown signals. Tests cover recovery behavior and performance.
Restart continuation selection and notes apps/server/src/orchestration-v2/SubagentProjection.ts, apps/server/src/orchestration-v2/RestartBackgroundNote.ts, apps/server/src/orchestration-v2/RestartContinuation.ts, apps/server/src/orchestration-v2/RestartContinuation.test.ts, apps/server/src/orchestration-v2/RestartBackgroundNote.test.ts, apps/server/src/orchestration-v2/ProviderTurnStartService.ts, docs/internals/server-updates.md	Continuation selection skips queued runs and uses completion-aware ordering. It checks for user interrupts and native maintenance commands. Restart notes carry cancelled background work across continuation attempts and count delivery when a completed provider turn exists.
Delegated-task reconciliation and startup apps/server/src/orchestration-v2/Orchestrator.ts, apps/server/src/orchestration-v2/DelegatedCompletionDelivery.test.ts, apps/server/src/orchestration-v2/EffectWorker.ts, apps/server/src/orchestration-v2/EffectWorker.test.ts, apps/server/src/orchestration-v2/ThreadManagementService.ts, apps/server/src/orchestration-v2/testkit/ProviderReplayHarness.ts, apps/server/src/mcp/OrchestratorMcpService.ts, apps/server/src/mcp/OrchestratorMcpService.test.ts, apps/server/src/serverRuntimeStartup.ts, apps/server/src/serverRuntimeStartup.test.ts, apps/server/src/relay/AgentAwarenessRelay.test.ts	The orchestrator holds child results and completion deliveries while restart continuations are pending. Startup recovers delegated tasks before the effect worker starts. Continuation failures recover delegated tasks when no retry will occur. MCP task reads report working while a delegated result is pending.
Scheduler activation gate apps/server/src/scheduling/Scheduler.ts, apps/server/src/scheduling/Scheduler.test.ts	Scheduler sources and the recurring tick loop start with parked forks. A test checks that due work waits until server activation.

Priority: ➖ Normal

Estimated code review effort: 4 (Complex) | ~60 minutes

Change: Bug fix

Suggested reviewers: juliusmarminge

Sequence Diagram(s)

sequenceDiagram
  participant ServerRuntimeStartup
  participant Orchestrator
  participant EffectWorker
  participant RestartContinuation
  participant ThreadManagementService
  ServerRuntimeStartup->>Orchestrator: recoverDelegatedTasks
  ServerRuntimeStartup->>EffectWorker: start after delegated recovery
  EffectWorker->>RestartContinuation: process continuation effect
  RestartContinuation->>ThreadManagementService: recoverDelegatedTask(threadId, sourceRunId)
  ThreadManagementService->>Orchestrator: forward per-task recovery

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Merge Risk: 🔵 Low · up to ad0bf

A shutdown signal can suppress provider events before the session layer closes. This is a bounded risk that warrants owner awareness before merging.

Security Architecture Review

Security architecture risk: 🔵 Low · up to ad0bf

Restart recovery changes when previously authorized work resumes and when results become final. The inspected paths preserve explicit stops and ownership checks, without a demonstrated expansion of access. Guarantees under concurrent recovery and some recovery failures remain partially established.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — The relevant failure scope includes saved delegated tasks, queued work and provider sessions recovered by a server against its database, rather than only the changed helper. Shutdown-signal suppression applies to that manager's provider event pumps. Tenant isolation and coordination between multiple recovery processes were not established.

Trust Boundaries and Controls

• observed — Restart notes do not introduce a new caller principal or provider authority in the inspected path. They are server-generated prompt text delivered through the existing session-start boundary. Eligibility checks match provider-thread ownership, provider instance and native-thread identity before selecting recoverable work.

Resilience and Maintainability Implications

• observed — After SIGINT or SIGTERM, provider events and ordinary stream-exit release handling are suppressed so shutdown owns release and recovery capture. Startup recovery and continuation-settlement callbacks log recovery failures; completing their invocation therefore does not prove that every delegated result was settled.

Hardening Proposals

• proposed — Consider durable retry or explicit degraded-recovery status when delegated settlement fails after a continuation declines or exhausts its retries. This would strengthen failure containment without depending on a later terminal event or another restart. It is a hardening proposal, not a verified security regression.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 52.17% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 23 functions across 28 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly summarizes the main change: preserving delegated tasks, queued work, and stop intent during server restarts.
Description check	✅ Passed	The description explains the problem, changes, and detailed verification, including test results and benchmark limits. It does not provide the template’s Scope and approval information, such as a link…

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Inline comments:
Review comments at @apps/server/src/orchestration-v2/ProjectionStore.ts:
- Around line 3812-3832: Update the ended-run ordering in the background roster
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📒 Files selected for processing (23)

• apps/server/src/mcp/OrchestratorMcpService.test.ts
• apps/server/src/mcp/OrchestratorMcpService.ts
• apps/server/src/orchestration-v2/DelegatedCompletionDelivery.test.ts
• apps/server/src/orchestration-v2/EffectWorker.test.ts
• apps/server/src/orchestration-v2/EffectWorker.ts
• apps/server/src/orchestration-v2/Orchestrator.ts
• apps/server/src/orchestration-v2/ProjectionRecovery.test.ts
• apps/server/src/orchestration-v2/ProjectionStore.ts
• apps/server/src/orchestration-v2/ProviderRuntimeRecoveryPerformance.test.ts
• apps/server/src/orchestration-v2/ProviderRuntimeRecoveryService.test.ts
• apps/server/src/orchestration-v2/ProviderRuntimeRecoveryService.ts
• apps/server/src/orchestration-v2/RestartBackgroundNote.test.ts
• apps/server/src/orchestration-v2/RestartBackgroundNote.ts
• apps/server/src/orchestration-v2/RestartContinuation.test.ts
• apps/server/src/orchestration-v2/RestartContinuation.ts
• apps/server/src/orchestration-v2/ThreadManagementService.ts
• apps/server/src/orchestration-v2/testkit/ProviderReplayHarness.ts
• apps/server/src/relay/AgentAwarenessRelay.test.ts
• apps/server/src/scheduling/Scheduler.test.ts
• apps/server/src/scheduling/Scheduler.ts
• apps/server/src/serverRuntimeStartup.test.ts
• apps/server/src/serverRuntimeStartup.ts
• docs/internals/server-updates.md

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Inline comments:
Review comments at @apps/server/src/mcp/OrchestratorMcpService.ts:
- Line 1063: Update the orchestrator flow around delegatedTaskResultPending so a
child-record read failure propagates instead of being treated as a settled task;
map that failure to an MCP error before reporting the terminal result or
acknowledging completion delivery.

Review comments at @apps/server/src/orchestration-v2/ProviderSessionManager.ts:
- Around line 365-383: Update the shutdownSignal handling used by startEventPump
so shutdownSignal.received is set only when the layer is actually closing, not
merely when SIGINT or SIGTERM is received. Keep provider events and
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📒 Files selected for processing (16)

• apps/server/src/mcp/OrchestratorMcpService.test.ts
• apps/server/src/mcp/OrchestratorMcpService.ts
• apps/server/src/orchestration-v2/DelegatedCompletionDelivery.test.ts
• apps/server/src/orchestration-v2/EffectWorker.ts
• apps/server/src/orchestration-v2/Orchestrator.ts
• apps/server/src/orchestration-v2/ProjectionStore.ts
• apps/server/src/orchestration-v2/ProviderRuntimeRecoveryService.ts
• apps/server/src/orchestration-v2/ProviderSessionManager.ts
• apps/server/src/orchestration-v2/RestartBackgroundNote.ts
• apps/server/src/orchestration-v2/RestartContinuation.ts
• apps/server/src/orchestration-v2/SubagentProjection.test.ts
• apps/server/src/orchestration-v2/SubagentProjection.ts
• apps/server/src/orchestration-v2/ThreadManagementService.ts
• apps/server/src/orchestration-v2/testkit/ProviderReplayHarness.ts
• apps/server/src/relay/AgentAwarenessRelay.test.ts
• packages/shared/src/orchestrationV2ThreadError.ts

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• apps/server/src/orchestration-v2/RestartBackgroundNote.ts

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• apps/server/src/mcp/OrchestratorMcpService.test.ts
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• apps/server/src/orchestration-v2/ProjectionRecovery.test.ts
• apps/server/src/orchestration-v2/ProjectionStore.test.ts
• apps/server/src/orchestration-v2/ProjectionStore.ts
• apps/server/src/orchestration-v2/RestartBackgroundNote.test.ts
• apps/server/src/orchestration-v2/RestartBackgroundNote.ts

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