Refuse malformed settings writes with typed recovery - #1331
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Parse the existing settings document under the workspace-history lock and stop configuration writes when its JSON is malformed. Return a stable settings_write_invalid_existing_json error with repair steps before any document or history mutation. Cover the refusal with a real persistence regression and disposable CLI acceptance, update the public error contracts and configuration guidance, and record the Sentry production defect plus verified closeout in pm history and the generated changelog.
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📝 SummarySummary by CodeRabbit
WalkthroughSettings writes now refuse to replace malformed existing ChangesMalformed settings write refusal
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Bug fix Merge Risk: 🔵 Low · up to The changelog misstates the fix, but the documented settings-write refusal is supported by the supplied code context. Correct the entry before release; this does not block merge. Architecture SummaryArchitecture risk: 🔵 Low · up to The change affects 5 systems. Changed systems: Architecture concerns Review detailsSystems and components
Before / after behavior
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches 💡 1🛠️ Fix failing CI checks 💡
📝 Generate docstrings
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Reviewer's GuideThe PR makes configuration writes fail safely and consistently when the existing settings.json is malformed by validating it within the workspace-history mutation, returning a typed exit-2 refusal with repair guidance, and leaving both the malformed file and history untouched. It also adds focused regression coverage and updates the generated SDK contracts, public snapshots, documentation, and changelog metadata. Sequence diagram for safe settings writes with malformed JSONsequenceDiagram
participant CLI
participant writeSettings
participant WorkspaceHistory
participant PmCliError
participant settingsjson
CLI->>writeSettings: writeSettings()
writeSettings->>WorkspaceHistory: mutateWorkspaceJsonWithHistory()
WorkspaceHistory->>settingsjson: read existing settings.json
alt existing JSON is malformed
WorkspaceHistory-->>writeSettings: JSON.parse() throws
writeSettings->>PmCliError: create settings_write_invalid_existing_json
PmCliError-->>CLI: exit 2 with repair nextSteps
WorkspaceHistory-->>settingsjson: preserve file and history
else existing JSON is valid or absent
WorkspaceHistory-->>writeSettings: current settings
writeSettings->>WorkspaceHistory: reconcile settings snapshot
WorkspaceHistory-->>CLI: write succeeds
end
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Actionable comments posted: 1
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
In @CHANGELOG.md:
- Line 9: Update the malformed settings writes entry under “Fixed” to state that
malformed writes now return a typed refusal, replacing the wording that
describes them escaping as unclassified Sentry faults.
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docs/generated/REFUSAL_CLOSURE_CENSUS.mdis excluded by!**/generated/**src/sdk/generated/generated-error-code-catalog-part-1.tsis excluded by!**/generated/**src/sdk/generated/generated-error-code-catalog-part-2.tsis excluded by!**/generated/**
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.agents/pm/extensions/.managed-extensions.json.agents/pm/history/pm-z329kd.jsonl.agents/pm/issues/pm-z329kd.toonCHANGELOG.mddocs/CONFIGURATION.mdsdk/public-surface.jsonsrc/core/store/settings.tstests/fixtures/contracts/full.jsontests/unit/core/store/settings-store.spec.ts
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Rename the closed PM issue to state the delivered behavior, then regenerate CHANGELOG.md from the updated item. This makes the Fixed entry describe the typed refusal rather than the escaped fault.
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Add five open PM issues for the recent command-help, linked-test evidence, history cursor, and two distinct Windows nightly failures. Each intake records its GitHub source, reproduction, acceptance criteria, parent, duplicate check, and typed historical relationships. Keep the two Windows shard failures separate because one timed out during bundled package initialization while the other failed the static inventory unreadable-source assertion. Verify every new history stream and the repository graph before review.
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Summary
settings.jsoncontains malformed JSON, with a stablesettings_write_invalid_existing_jsonerror and repair steps._workspacehistory on refusal. Keep valid writes and settings snapshot reconciliation working.pm-changelogoutput.PM lineage
Verification
SyntaxError, then green after the fix.settings.jsonor creating_workspacehistory; retry succeeded after repair.npxandbunxsmoke passed with nine packages. Docs/skills, graph composition, record integrity, mutation, and changelog checks passed.get364/362 ms,next550/440 ms,create553/398 ms). The benchmark limits are unchanged; hosted gates will provide the clean runner verdict.The Sentry event occurred on the published
2026.9.27release before this fix. A merged commit is not a published release.New GitHub issue intake
These five reports have distinct open PM owners with all-status duplicate checks and typed lineage. They are tracked for follow-up; this PR does not claim to fix them.
All five new history streams verify, graph composition passes, and repository history drift is zero across 2,821 items. No item outside active implementation was put in progress.