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fix(write-to-file): capture streaming failure once, report it once (split 3/6 of #1066) - #1930
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📝 Summary
Merge Risk: 🟡 Moderate · up to When a malformed file-write call is cleaned up, a failure while saving the error message can prevent the tool result from being sent, which can leave the conversation stuck. When rollback fails, the model is also not told that its call was malformed. Fix the result-emission ordering before merging; the diagnostic gap is smaller. Pre-merge checks |
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Lifecycle Resource Cleanup |  |
The changed cancellation path can perform diff-view work after cancellation. handlePartial() checks isStreamCancelled() before open() at src/core/tools/WriteToFileTool.ts:581-589, but it does … |
Make the diff-view phase cancellation-aware. Re-check isStreamCancelled(task) after open() and after update() before the next visible operation. When cancellation is detected, stop the partial operation and ensure the diff view is rev… |
✅ Passed checks (7 passed)
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Check name Status Explanation Linked Issues check Issue [ #1935] requires one captured streaming failure, one report, and the authoritativeexecute()error.WriteToFileToolstores failure state per task, suppresses failed retries, releases state o…Out of Scope Changes check The BaseToolhook is required when malformed input skipsexecute().presentAssistantMessagechanges are required to release stream state before its own result.DiffViewProviderrollback change…Regression Evidence Focused regression coverage is present for the changed behavior. writeToFileTool.spec.tscovers streaming failure capture, suppression of duplicate reports, parse-failure reporting, rollback failure…Security Boundaries No changed path introduces a security-boundary failure. In src/core/tools/WriteToFileTool.ts,execute()still validatesrelPathwithrooIgnoreController.validateAccess()before its guarded fil…Persistence Integrity No changed persistence defect meets the check. The new rollback path awaits revertChanges(),applyEdit(), buffer saves, tab closes,fs.unlink(), andfs.rmdir(). `DiffViewProvider.revertChanges…Title check The title clearly identifies the main change: capturing and reporting write-to-file streaming failures once. It is concise and related to the changeset. Description check The description provides the linked issue, implementation scope, design details, test results, coverage, lint status, and reviewer context. It does not use every template heading and omits the explici…
Full details: Lifecycle Resource Cleanup
-
Explanation
The changed cancellation path can perform diff-view work after cancellation.
handlePartial()checksisStreamCancelled()beforeopen()atsrc/core/tools/WriteToFileTool.ts:581-589, but it does not check again after the awaitedopen()orupdate()at lines 591-598. IfopenDiffEditor()orapplyEdit()remains pending whenTask.abortTask()emitsTaskAborted, the new abort listener removes the task state, but the suspended call resumes and still updates the diff view. This duplicates work after cancellation and can race withTask.dispose()rollback and reset. The added cancellation tests covergetState(), the file probe, andask(), but not these diff-view awaits.Resolution
Make the diff-view phase cancellation-aware. Re-check
isStreamCancelled(task)afteropen()and afterupdate()before the next visible operation. When cancellation is detected, stop the partial operation and ensure the diff view is reverted/reset in a guarded cleanup path. Also prevent a stale in-flight partial operation from acting after its per-task state has been removed, for example by capturing a state-generation token and validating it beforeopen()/update()and in the completion path. Add regression tests that abort whileopen()and whileupdate()are pending, then assert that no later diff update occurs and that the diff-view resources and per-task state are released.
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Review statusThanks for contributing. This comment tracks the review sequence and the next action. Current step: Address automated review findings and push fixes. After fixes are pushed and required CI passes, automated review restarts. Review-state labels are managed by this workflow; do not edit them manually. |
…rtial-path case The core project passes locally at this head (174 files, 3274 tests) and the case passes in isolation and with the whole core/tools directory. The ubuntu run reported 0 calls to createDirectoriesForFile on the stabilized-path assertion, which does not reproduce; re-running to confirm.
… no-filesystem contract
platform-unit-test (ubuntu-latest) fails on this branch while it passes locally, because the failing case
is it.skipIf(process.platform === "win32"): Windows CI and every local run skip it.
The case predates this unit. It asserted that the second streaming delta calls createDirectoriesForFile,
which is exactly the call this unit removes: an unguarded mkdir in handlePartial threw EROFS up into
BaseTool.handle(), which never set didRejectTool/didAlreadyUseTool, so presentAssistantMessage's
advancement gate was never reached and the agent loop stalled. The unit's own regression test ("EROFS in
handlePartial does not stall agent loop") pins the new contract; this older case still asserted the old
one, so the two contradicted and only Linux CI noticed.
Rewritten as "defers parent directory creation to execute() while streaming": no filesystem work during
streaming, and the directories are still created by the authoritative non-partial execute(). Same intent,
new contract.
Local run: 34 passed / 5 skipped in the file; the rewritten case also passes when the win32 skip is
lifted temporarily, so the flow is verified on this machine too.
Codecov Report❌ Patch coverage is 📢 Thoughts on this report? Let us know! |
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Inline comments:
Review comments at @src/core/tools/WriteToFileTool.ts:
- Around line 162-183: Add task-scoped cleanup after each completed
write_to_file block by overriding WriteToFileTool.handle() and, in a finally
block when block.partial is false, reset inherited path-tracking state and call
clearTaskState(task). Do not call global resetPartialState() for this path;
leave partial blocks untouched and preserve the existing streaming-failure
cleanup.
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Check persistence and lifecycle invariants: awaited atomic writes, rollback or explicit partial-failure behavior, cross-window state consistency, stale listeners/watchers, cancellation, idempotency, and safe restart/resume without lost or d...
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src/core/task/Task.ts (1)
2753-2783: LGTM!src/core/task/__tests__/Task.spec.ts (1)
5927-6323: LGTM!src/core/assistant-message/__tests__/presentAssistantMessage-custom-tool.spec.ts (1)
92-92: LGTM!src/core/tools/WriteToFileTool.ts (1)
356-441: LGTM!src/core/tools/__tests__/writeToFileTool.spec.ts (1)
448-814: LGTM!src/core/webview/ClineProvider.ts (1)
640-643: LGTM!src/__tests__/removeClineFromStack-delegation.spec.ts (1)
212-250: LGTM!src/core/tools/__tests__/writeToFileTool-partial-state-cleanup.spec.ts (1)
1-100: LGTM!
… other tasks BaseTool.handle()'s parameter-parse branch reported the error and returned without any teardown, so a task whose streaming delta had failed kept streamFailed in this singleton: every later write_to_file in that task then skipped the diff preview. execute() never runs on that path, so nothing else released it. Adds a protected BaseTool.clearTaskStreamState(task) hook (no-op by default) called from that catch, and WriteToFileTool overrides it with resetTaskPartialState(task). The hook is per-task on purpose: these tool instances are singletons shared by concurrent tasks, and the existing global resetPartialState() clears the whole taskPartialStreamState map. The same cross-task hazard applies inside execute(), which called that map-wide reset on both its success and error paths: task A's write was deleting task B's streamFailed/streamError while B was still streaming (duplicate partial ask, lost error). execute() now calls super.resetPartialState() for the genuinely instance-global base field plus resetTaskPartialState(task). The error path also finalizes the partial ask that the diff-view branch opened, so a failed write no longer leaves the spinner and Save/Reject live. Tests (writeToFileTool.spec.ts, per-task stream state isolation): parse-failure teardown releases this task and keeps the other task's entry; another task's streamFailed/streamError survive execute(); a failing save finalizes the ask with the exact partial payload. All three fail on the pre-fix code (3 failed / 34 passed) and pass after (37 passed). Local: eslint clean on all three files with --prune-suppressions (no suppression change), package tsc clean.
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Checked this unit against the Persistence Integrity explanation, which names
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… early DiffViewProvider.open() creates the parent directories and writes an empty placeholder BEFORE it awaits openDiffEditor(). If that await rejects there is no activeDiffEditor, and revertChanges() bailed out on `!this.activeDiffEditor` - leaving the placeholder and the new directories on disk. The next execute() then saw an empty file and treated the requested new file as an existing one, so a denial preserved the debris instead of removing it. The streaming-failure cleanup in handlePartial() calls exactly this rollback, so the debris was reachable from the new path in this unit. The filesystem rollback now runs regardless of the editor: only the document work (save the dirty buffer, close the diff views and the tab) needs one. removeCreatedFile/removeCreatedDir tolerate ENOENT, since the failed open may never have written the placeholder - that must not abort the rest of the cleanup. Tests: 'revertChanges() removes the placeholder and created dirs when open() failed before the editor existed' (unlink for the relPath, rmdir in reverse order) and 'revertChanges() tolerates a placeholder that was never written' (ENOENT rejection does not propagate, delete still attempted). Pin: restoring the old `!this.activeDiffEditor` early return fails both. Local: integrations/editor + writeToFileTool.spec + core/task + assistant-message = 786 passed (the single remaining failure, saveChanges default delay, reproduces without these changes); tsc 0; eslint 0 err / 0 warn on both files.
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The pre-merge table still reported the Persistence Integrity error at the previous head. The last round fixed one call site - the new-file rollback - but the defect class has a second call site: the existing-file branch of revertChanges() built its own WorkspaceEdit, discarded the boolean result of workspace.applyEdit(), and saved unconditionally, so a refused restore wrote unapproved streamed content into an existing file. Fixing one call site is not fixing the defect class. The branch now runs through the same callee-owned contract as the new-file rollback instead of adding a third inline copy of the check: restorePreStreamBuffer() throws when the editor refuses the restore, so the save that follows cannot run, and saveBufferClean() now treats a save that did not happen as a failure rather than a success. Both methods accept the document explicitly, because this branch reached it through activeDiffEditor; resolving it again by path could pick a different buffer or none, and none would skip the restore in silence. One test leaves the path lookup empty on purpose so that assumption is pinned rather than assumed. Same-class call sites in the same file that this change deliberately does not sweep, registered here rather than changed: the save in showEditedFileWithoutDisruptingFocus, the three applyEdit calls in saveChanges and its append path, the save in saveChanges, and the save in keepOrCloseEditedFile. None is on the rollback path this unit changed; each needs its own row or issue. Nine test fixtures mocked TextDocument.save() as resolving undefined; the API resolves a boolean, so they now resolve true - the new failure check would otherwise be reading a fixture inaccuracy. Verified: integrations/editor 95 passed (three new tests: real restore-and-save for an existing file, no save on a refused restore, failure on a save that did not happen), core/tools 669, core/task 829; eslint . --ext=ts --max-warnings=0 exit 0 with no suppression count increase; tsc --noEmit 0 errors; prettier --check . reports 0 offenders in a worktree checked out with core.autocrlf=false. Negative controls, each restored byte-for-byte: dropping the refused-restore check turns exactly the two refused-restore tests red (the contract now guards both branches); dropping the failed-save check turns exactly its own test red; resolving the existing-file document by path again turns three tests red, which is the evidence that passing the document explicitly is load-bearing.
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…er parse-failure no-state branch Clears the two actionable rows of the CodeRabbit pre-merge table at head 9c54765. Persistence Integrity (error): handlePartial() recorded a refused rollback only as the stream error and always continued to resetDiffViewAfterWrite(), so the next execute() re-opened the diff view and could save the dirty, never-approved streamed buffer before approval (reset() cannot close a dirty diff tab). The refused rollback is now recorded as an unrecoverable per-task failure (rollbackFailure). execute() checks it before any write path - no open/update/save, no directory creation - reports the recorded failure exactly once, and releases the per-task state. The parse-failure path keeps reporting the same failure once when the final block never parses, because execute() released the state on its way out. Regression Evidence (warning): the parse-failure hook's no-state branch had no focused test - every parse-path test seeded a stream-state entry first. Added a handle() test that submits a completed block without nativeArgs before any partial delta and counts handleError calls by context: exactly one "parsing write_to_file args", no "writing file", an empty per-task state map, and the diff view untouched. Negative controls: dropping the record line or neutering the execute() guard reddens only the new fail-closed test; flipping the no-state branch to return true reddens only the new parse-error test and stays green against the previous spec, proving that branch was uncovered. The new fail-closed test is red against the pre-fix head. Test doubles for the widened TaskPartialStreamState are completed in this commit.
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Accepting the four-exit rollback row as a known gap on this unit rather than inventing the shape here. The row asks that approval denial, parse failure, streaming failure and task abort share one fail-closed rollback path. That shape is defined by a unit earlier in the merge order - 1928, then 1931, then 1929, then this unit, then 1932 - so introducing a competing version of it in this branch would give the chain two definitions of the same contract and guarantee a conflict at merge time. What this unit does carry is the streaming-failure half of that contract: the capture-to-report path records the original streaming error, keeps it reachable when the rollback itself fails, and reports it exactly once. The remaining exits are ported forward from the defining unit, re-derived per branch rather than copied byte for byte, because each unit branch has a different surrounding scope and a copied hunk would silently bind to the wrong state. Registered as a chain-level defect on tracking issue 1989 rather than argued away here; the row is accepted, not disputed. |
…ompletion caller The parse-failure teardown this unit added is reached only from BaseTool.handle(), but the production malformed-completion path never gets there: presentAssistantMessage emits its own tool_result and returns for a completed known-tool block that has no nativeArgs, so tool.handle() - and with it releaseStreamStateOnParseFailure() - never runs. The per-task stream entry and its TaskAborted listener were retained for the life of the task, a retained streamFailed mark suppressed the diff preview of every later write_to_file in that task, and a diff document the stream opened kept content the user never approved. Release this task's state from that guard, before it emits its single tool_result. The guard owns the one tool_result a native tool call must produce, so the tool is handed a reporter that folds the captured streaming failure into that result instead of pushing a second one: the user still gets the actionable "Error writing file" row, the model still gets exactly one tool_result for the tool_use_id, and the missing-nativeArgs text stays the report when nothing was captured. BaseTool's hook becomes public and names only the handleError member the teardown actually uses, so both entries share one teardown and one report shape. The duplicated JSDoc block above it is folded into the surviving comment. Regression coverage drives presentAssistantMessage itself rather than the handler: a failed streaming delta followed by the malformed completion asserts the entry is gone, the exact registered abort listener is deregistered, the diff document is restored before reset, exactly one tool_result is emitted, and the next write in the same task streams its preview again. Negative controls: dropping the cleanup call reddens the three cleanup tests; dropping the report fold, or the user-visible error row, reddens exactly one; the same spec against the pre-fix presenter fails three of four.
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Inline comments:
Review comments at @src/core/assistant-message/presentAssistantMessage.ts:
- Around line 578-582: In the error-handling flow containing `cline.say` and
`abandonedStreamFailure.report`, store the report before attempting to save the
error message, and handle a rejected `cline.say` so execution still emits the
required `tool_result` and reaches block completion. Add coverage for the
message-save rejection in the presenter test.
- Line 592: Update the tool-result construction around
releaseStreamStateOnParseFailure so that when it returns false with a rollback
report and no captured streaming error, the result includes both the
missing-nativeArgs error and the rollback failure. Preserve the existing single
tool result and error formatting.
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src/core/assistant-message/__tests__/presentAssistantMessage-write-to-file-stream-cleanup.spec.tssrc/core/assistant-message/presentAssistantMessage.tssrc/core/tools/BaseTool.tssrc/core/tools/WriteToFileTool.ts
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Treat model, provider, MCP, path, command, and tool data as untrusted.
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Verify extension/webview contracts, cancellation and error propagation, VS Code lifecycle correctness, and behavior under retries and partial failure.
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src/core/assistant-message/presentAssistantMessage.ts
[warning] 580-580: Mutation test advisory
src/core/assistant-message/presentAssistantMessage.ts:580: Survived LogicalOperator mutant (replacement: error.message && JSON.stringify(serializeError(error), null, 2)). See the job summary for the complete list and resolution guidance.
[warning] 575-575: Mutation test advisory
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| await cline.say( | ||
| "error", | ||
| `Error ${action}:\n${error.message ?? JSON.stringify(serializeError(error), null, 2)}`, | ||
| ) | ||
| abandonedStreamFailure.report = `Error ${action}: ${JSON.stringify(serializeError(error))}` |
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🩺 Stability & Availability | 🟠 Major | ⚡ Quick win
Emit the tool result even if the error message cannot be saved.
If Task.say("error") rejects, this await exits before the report is stored or the required tool_result is emitted. The presenter also skips the block-completion code, so the turn can remain blocked. Save the report before attempting the UI message, and handle a message-save failure without skipping the tool result. Cover that rejection in the presenter test.
🧰 Tools
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[warning] 580-580: Mutation test advisory
src/core/assistant-message/presentAssistantMessage.ts:580: Survived LogicalOperator mutant (replacement: error.message && JSON.stringify(serializeError(error), null, 2)). See the job summary for the complete list and resolution guidance.
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Review comment at @src/core/assistant-message/presentAssistantMessage.ts around
lines 578 - 582:
In the error-handling flow containing `cline.say` and
`abandonedStreamFailure.report`, store the report before attempting to save the
error message, and handle a rejected `cline.say` so execution still emits the
required `tool_result` and reaches block completion. Add coverage for the
message-save rejection in the presenter test.
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| type: "tool_result", | ||
| tool_use_id: sanitizeToolUseId(toolCallId), | ||
| content: formatResponse.toolError(errorMessage), | ||
| content: formatResponse.toolError(abandonedStreamFailure.report ?? errorMessage), |
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🎯 Functional Correctness | 🟡 Minor | ⚡ Quick win
Keep the missing-arguments error when rollback also fails.
If an open preview has no captured streaming error and revertChanges() fails, releaseStreamStateOnParseFailure() reports the rollback failure and returns false. This expression uses the rollback report alone. The model never receives the missing-nativeArgs error. When the hook returns false with a report, include both errors in the single tool result.
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only still-valid issues, skip the rest with a brief reason, keep changes
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Review comment at @src/core/assistant-message/presentAssistantMessage.ts at line
592:
Update the tool-result construction around releaseStreamStateOnParseFailure so
that when it returns false with a rollback report and no captured streaming
error, the result includes both the missing-nativeArgs error and the rollback
failure. Preserve the existing single tool result and error formatting.
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U5 — streaming failure capture + single error reporting
Part of the upstream PR 1066 split. Own issue: 1935. Content source of record:
72143527fd33306e5541116093c2cbf803cce9e0..pr-1066-audit).Why this unit exists: handlePartial captures the streaming failure once and reports it once - no duplicate error bubble; the authoritative execute() error is the one surfaced.
Boundaries
52699c6cd4b23b6a2772143527fd33306e5541116093c2cbf803cce9e0..pr-1066-audit(local)Fidelity (machine-verified)
Result: PASS — standalone 283 a+d / 2 files (UNDER-SOFT)
src/core/tools/WriteToFileTool.ts: OK (content subset of source)src/core/tools/__tests__/writeToFileTool.spec.ts: OK (content subset of source)Design contract
Chain position
Merge order is fixed: U12 (1927) -> U4 -> U5 -> U3 -> U6 -> U7 -> FINAL (1928). This PR is opened against
mainbecause the split branches live on the fork; the diff GitHub shows is therefore cumulative through this unit. The unit's own content is the delta from the previous unit head (U4), listed under Fidelity above. The sole merge target of the series is the FINAL integration PR (1928); merging the chain in order keeps every bot-visible diff clean.Verification (this unit, as pushed)
.changesetfile, no CHANGELOG edit.Recreate policy
If the bot stalls on a pre-merge check and the existing head cannot obtain bot review/approval (empty-commit re-trigger attempted and failed), the unit is recreated from the tagged content source of record — never from a per-PR head. At most 1 PR per issue.
Linked issue
Closes #1935 (unit U5 of the upstream PR 1066 split).
Round update — Lifecycle Resource Cleanup + regression evidence for the rollback this unit changed
Shared root cause behind the
Lifecycle Resource Cleanuprow (all five units of 1066).handlePartial()registers this task's partial-stream entry — and itsTaskAbortedlistener — before it checks the prevent-focus-disruption experiment. With the experiment enabled the delta returns without ever showing a preview and never reachesexecute()'s teardown, so the entry and the listener stay attached for the rest of the task's life, and astreamFailedmark armed by an earlier failed delta keeps suppressing this task's later diff previews. The sibling units carry the same release in their own PRs, each verified red-first with a negative control.This unit (U5):
execute()is covered by thefinallyblock, so only the suppressed-preview return inhandlePartial()lacked a release; it now has one.Red first: the new test failed with
expected 1 to be +0. Green: 40 passed / 5 skipped. Negative control: removing the release turns exactly that one test red; restored green.Regression evidence for the
revertChanges()rollback this unit changed, added at the owning layer (DiffViewProvider.spec.ts):activeDiffEditorstops at the guard instead of dereferencing it — negative control: removing the guard makes the call reject withTypeError: Cannot read properties of undefined (reading 'document'), i.e. the guard is observably what stops it;rmdirENOENT) does not abort the remaining rollback — negative control: dropping the ENOENT tolerance turns exactly that test red;rmdirfailure still reaches the caller — negative control: widening the tolerance to swallow every error turns exactly that test red. Together these pin fail-closed behaviour against over-tolerance.Main refresh. Merged org main
036245c5e(U1 1927). U1's content no longer appears in this diff: 11 files +1471/−40 → 8 files +1091/−35, 0 behind main. Conflicts were confined tosrc/core/task/__tests__/Task.spec.ts(andTask.tson U7) — the region U1 rewrote; resolved by taking main's version of the shared save-stage tests (try/finally plus the fixed-task-idui_messages.jsoncleanup fromcf9206a42) rather than re-implementing U1.Verification after the merge: Task.spec 172 passed, writeToFileTool.spec 40/5, DiffViewProvider.spec 76 passed / 0 failed (the
saveChangesdefault-values failure that was red locally on this branch is fixed by main), eslint 0/0.