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ApprovabilityVerdict: Approved at Macroscope's review found this PR approvable — This is a focused server concurrency fix that isolates slow VCS repository checks while preserving ordered lifecycle and checkpoint handling. The added regression coverage exercises blocked detection, turn settlement, and late-result behavior without introducing schema, configuration, or new product capability changes. You can add or adjust custom eligibility rules. Learn more. |
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Included review availability: Your plan provides up to 10 included reviews per hour; 8 remain after this review. 📝 WalkthroughWalkthroughProvider diff events now use a dedicated detection and lifecycle path. The lifecycle records missing-checkpoint placeholders only for eligible running turns. The decider rejects placeholders that would overwrite captured checkpoints. Tests cover blocked detection and checkpoint races. ChangesProvider diff ingestion and checkpoint protection
Priority: ⬇️ Low Estimated code review effort: 4 (Complex) | ~45 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant ProviderRuntimeIngestion
participant diffWorker
participant CheckpointStore
participant worker
participant Decider
ProviderRuntimeIngestion->>diffWorker: enqueue turn.diff.updated
diffWorker->>CheckpointStore: call isGitRepository
diffWorker->>worker: enqueue validated diff input
worker->>Decider: dispatch missing checkpoint completion
Decider->>Decider: reject placeholder if captured checkpoint exists
Suggested reviewers: Merge Risk: ⚪ Minimal · up to The change includes protection against late checkpoint placeholders and regression coverage for blocked repository detection. No current merge-blocking risk is identified. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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In `@apps/server/src/orchestration/Layers/ProviderRuntimeIngestion.ts`:
- Line 2254: Make checkpoint admission atomic with placeholder creation in
recordProviderDiff: move the same-turn checkpoint existence check into the
serialized command transaction or otherwise combine it with placeholder
creation, so a concurrently committed real checkpoint cannot be overwritten by a
later placeholder. Preserve the existing behavior of skipping creation when
checkpointContext is absent or the turn already has a checkpoint.
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apps/server/src/orchestration/Layers/ProviderRuntimeIngestion.test.tsapps/server/src/orchestration/Layers/ProviderRuntimeIngestion.ts
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On the docstring coverage warning: leaving as is. The repo's convention (AGENTS.md, "Taste") is comments that describe how a thing is used rather than docstrings on every function, and the two touched functions are private, single-purpose helpers whose names and call sites already say what they do. Adding JSDoc blocks solely to satisfy the threshold would be noise. |
Provider diff events detect the Git repository through VCS subprocesses. When git was slow or hung, that single event stalled the serial ingestion worker and turn.completed sat behind it, so the turn never settled. Route turn.diff.updated to its own drainable worker so diff bookkeeping cannot delay lifecycle and message events. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
With diff bookkeeping on its own worker, repository detection can return after the turn completed or a newer turn started. The placeholder checkpoint then rewrote a failed turn as completed and moved the latest-turn pointer back to the old turn. Re-read the turn after detection and skip the placeholder unless it is still running. The checkpoint reactor owns the checkpoint after that. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Reading the turn state on the diff worker and then dispatching left a window where the lifecycle worker could settle the turn in between, so the placeholder still landed on a finished turn. The diff worker now only performs repository detection and hands the confirmed diff back to the lifecycle worker, which runs the running-turn check and the dispatch in order with the turn's terminal events. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Provider diff ingestion checks for an existing checkpoint before dispatching a placeholder, but CheckpointReactor can commit the real capture between that read and the dispatch. Enforce the rule in the decider, which runs under the engine's command lock, so a late placeholder can no longer clobber a captured checkpoint in the SQL projection. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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What Changed
Provider
turn.diff.updatedevents are now handled by a dedicated ingestion worker for the slow part only: resolving the workspace path and running Git repository detection through the VCS subprocess layer. When the workspace is a repository, the diff is handed back to the lifecycle worker, which performs the running-turn check, the existing-checkpoint check, and the placeholder dispatch in order with the turn's terminal events.A placeholder that resolves after the turn already settled is dropped. The checkpoint reactor owns the checkpoint from that point on.
Drain empties the diff worker before the lifecycle worker, since the diff worker feeds it.
One new test blocks repository detection with a deferred, completes the turn as failed and starts a newer turn while it is blocked, then releases detection. It asserts the session settled and the final reply persisted while blocked, that no checkpoint was created for the finished turn, that the newer turn stays the latest turn, and that the failed turn still reads as
error.Why
All provider events were ingested by a single serial worker. Handling a diff event calls
isGitRepository, which spawns git subprocesses behind a bounded semaphore. When git was slow or hung, that one event stalled the worker, soitem.completedandturn.completedsat in the queue and the turn never settled in the UI even though the agent had finished.Moving detection off the lifecycle worker fixes the stall. Handing the confirmed diff back to the lifecycle worker, rather than dispatching from the diff worker, keeps the guard and dispatch atomic with respect to
turn.completed: the projection unconditionally sets the thread's latest turn on a diff event and rewrites a non-running turn's state to completed, so a late placeholder would otherwise change a failed turn to completed or move the latest-turn pointer back to an older turn.Not in scope: the checkpoint reactor's real checkpoint dispatch has no late check either, so a very slow capture can still move the latest-turn pointer. That is existing behavior on main and is left for a separate change.
Checklist
Verified with the full
ProviderRuntimeIngestiontest file (79 passed), server typecheck, and format/lint on the touched files.Implemented with Claude Fable 5.1 in Claude Code, running inside T3 Code.
🤖 Generated with Claude Code
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