fix(sdk): invalidate read cache on write attempts - #450
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Session-Id: 01a044d6-9721-7000-aa64-b199686195b3
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📝 WalkthroughWalkthroughThe TypeScript SDK now invalidates file-read cache entries before and after write attempts. Tests cover revision conflicts for all affected mutation methods. Trajectory records document the completed change. ChangesSDK cache invalidation
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🔵 Low · up to The cache behavior fix is localized and verified, but the PR also commits a developer workstation path that exposes a local username and directory layout to repository readers; remove or redact that path before merging. Suggested reviewers: Poem
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 16.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 6 functions across 2 files. (3 skipped: 3 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Relayfile Eval ReviewRun: Passed: 4 | Needs human: 0 | Reviewable: 0 | Missing output: 0 | Failed: 0 | Skipped: 0 Human Review CasesNo reviewable human-review cases captured Relayfile output. |
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Inline comments:
In @.trajectories/completed/2026-08/traj_7n063n1f3wai.json:
- Line 47: Replace the absolute workstation path in the trajectory artifact’s
projectId field with a repository-scoped identifier, or remove projectId if it
is not required by consumers; do not retain local username or directory
information.
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.trajectories/completed/2026-08/traj_7n063n1f3wai.json.trajectories/completed/2026-08/traj_7n063n1f3wai.md.trajectories/index.jsonpackages/sdk/typescript/src/client.test.tspackages/sdk/typescript/src/client.ts
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All reported issues were addressed across 5 files
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Session-Id: 01a044d6-9721-7000-aa64-b199686195b3
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Summary
Strategy
A write attempt invalidates the client knowledge of the path revision regardless of the outcome. A 409 is positive evidence that the cached revision is stale.
This uses pre-request plus finally eviction. Pre-request eviction prevents new callers from hitting knowledge invalidated by the attempt. The finally eviction removes any entry or tracked in-flight read that a concurrent reader may have created while the mutation was pending. The tradeoff is an extra refetch after unrelated failures such as auth or network errors; that is intentionally conservative because a network failure does not always prove the server rejected the mutation.
Conflict-specific eviction was rejected because it relies on recognizing every present and future conflict shape and leaves ambiguous network outcomes cached.
Sibling audit
All cache-aware mutation paths in client.ts had success-only ordering and shared the defect: writeFile, mergeFile, bulkWrite, and deleteFile. They now use the same invalidation bracket.
Evidence
Source ablation with the five new tests unchanged:
Full package verification:
Limits
The mocked tests prove SDK request/cache behavior, including that the cache is populated before the conflict and that the next read performs a GET. Without a live relayfile server they cannot prove server-side CAS timing, propagation latency, or adapter-core end-to-end convergence under real concurrent writers.