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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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Merge Risk: ⚪ Minimal · up to No actionable merge-blocking risk was established for the reviewed changes; the rollback paths inspected preserve the file when saving or closing fails. Pre-merge checks |
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Lifecycle Resource Cleanup |  |
WriteToFileTool.handlePartial() still performs work after cancellation. After the cancellation check at lines 584-587, it awaits diffViewProvider.open() at lines 591-593 and then unconditionally c… |
Re-check isStreamCancelled(task) after diffViewProvider.open() resolves and before calling update(). If cancellation is detected, release the task state and close or revert the diff view before returning. Also add a regression test wi… |
✅ 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 per-task streaming and rollback failures, suppresses later failed d…Out of Scope Changes check The BaseToolhook and presenter changes support the malformed-completion path because that path skipsexecute(). Per-task cleanup, provider disposal cleanup, andDiffViewProviderrollback safegu…Regression Evidence Focused regression coverage is present for the changed behavior. writeToFileTool.spec.tscovers streaming open/update failures, single-report execution and parse-failure paths, rollback-failure prec…Security Boundaries No changed path meets the security failure conditions. WriteToFileTool.execute()still validatesrelPathwithvalidateAccess()and requiresaskApproval()beforesaveDirectly()or `saveChange…Persistence Integrity No changed persistence path meets the failure condition. The new filesystem and editor operations are awaited: rollback uses awaited revertChanges(),fs.unlink,fs.rmdir,applyEdit, and buffer…Title check The title clearly identifies the primary change: capturing and reporting write-to-file streaming failures once. Description check The description identifies the linked issue, explains the implementation scope, documents design boundaries, and provides detailed test and verification results. It does not use every template heading…
Full details: Lifecycle Resource Cleanup
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Explanation
WriteToFileTool.handlePartial()still performs work after cancellation. After the cancellation check at lines 584-587, it awaitsdiffViewProvider.open()at lines 591-593 and then unconditionally callsdiffViewProvider.update()at lines 595-598. If cancellation occurs whileopen()is pending,TaskAbortedclears the per-task state and the continuation can still update the diff editor after cancellation.DiffViewProvider.open()performs filesystem/editor work and installs editor listeners, so this can update a view that the task has already abandoned. The added cancellation tests covergetState, the file probe, andask, but not theopen()boundary.Resolution
Re-check
isStreamCancelled(task)afterdiffViewProvider.open()resolves and before callingupdate(). If cancellation is detected, release the task state and close or revert the diff view before returning. Also add a regression test with a deferredopen()that aborts the task before resolving, then assert thatupdate()is not called and diff-view cleanup runs.
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…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.
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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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…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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… teardown fails Two findings on the caller-side release, both about the one tool_result this guard owes the provider. A rejected Task.say() escaped the reporter, so the guard exited before storing the failure text and before emitting the tool_result: the provider was left with a tool_use that has no matching result and the block-completion bookkeeping never ran. Store the report before attempting the chat row, and treat a teardown that throws as a logged leak rather than a reason to skip the mandatory result. The hook also reports - and still returns false - when a refused rollback found no captured streaming error standing in for the parse error. That is a second, distinct failure, so the single tool_result now carries both it and the missing-nativeArgs error; using the rollback report alone told the model the call was malformed and then stayed silent about it. Dropping the nullish fallback in the error row removes a branch no caller can reach - the hook only ever reports Error values - which is also the surviving mutant the mutation-diff advisory named. Coverage: a rejected chat row still yields exactly one tool_result carrying the streaming failure and marks the block complete; a refused rollback yields one tool_result naming both failures. Negative controls: rethrowing from the teardown reddens exactly the first, dropping the second failure from the result reddens exactly the second.
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Inline comments:
Review comments at @src/core/assistant-message/presentAssistantMessage.ts:
- Line 584: In handleError, catch failures from cline.say("error") so they do
not prevent releaseStreamStateOnParseFailure() from returning its intended value
or add an incidental error to the tool result. Update the rejected-say() case in
presentAssistantMessage-write-to-file-stream-cleanup.spec.ts to assert the
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…ailure The guard's catch kept the mandatory tool_result, but it also swallowed the rejection before the release call could answer whether its failure replaces the parse error, so a task whose chat row could not be saved reported the captured streaming failure together with the incidental missing-nativeArgs text. Catch the row inside the reporter instead: the hook's answer survives, the tool_result names only the failure the user can act on, and the outer catch still covers the rest of the teardown. The rejected-row test now asserts the result does not name the malformed call. Negative control: rethrowing from the inner catch reddens exactly that test, one of six.
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Re-printed at the current head, so citing the existing disposition instead of re-arguing it. The Persistence Integrity row on this head asks for the same contract the row on the previous head asked for: a refused restore, save or close must not be followed by a reset() that clears the edit state while the streamed buffer stays dirty and saveable, and the fail-closed rollback shape that answers it is defined by a unit earlier in the merge order. That disposition is recorded in comment 6103341956 and registered as a chain-level defect on tracking issue 1989. This head does not change it. What moved is only the code the row points at. The two commits since the previous head, 9bdc349 and 3e8c7b6, are caller-side only: the first keeps the single tool_result reachable when the error row cannot be saved and keeps the malformed-call error in that result when the rollback also failed, the second keeps a lost chat row from changing which failure that result names. Neither touches the rollback shape, so the row is expected to stay red until the owning unit lands that shape and this branch ports it. No new argument here: the row is accepted, not disputed. |
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Persistence Integrity (pre-merge check) — the recovery path is the recorded rollback failure; no code change at this head The row asks that a refused streaming rollback not leave the dirty unapproved buffer without a recovery path. At this head the recovery path exists and sits at the tool boundary:
Tests that pin this (all
The residual the row describes — a user manually saving the still-dirty tab — is a user action on a visible buffer after the failure has been reported; the tool itself never persists the unapproved content. The row's suggested mechanism (retry the restore, retain the edit context, or make the buffer unsaveable) is the editor-boundary half of the four-exit rollback shape, which is owned by the units earlier in the merge order and is already recorded as an accepted known gap in comment 6103341956 — not restated here. |
The branch that converts a rejected tabGroups.close() into a rollback failure had no focused test: the spec covered only a close that resolves false. Add the rejected-close test at the same layer, pinning that revertChanges() rejects with the rollback error, keeps the original rejection as its cause, and leaves the placeholder unlink and the created-directory rmdir unrun - after a refused discard the caller owns the next step, so the rollback must not delete underneath the still-open tab. Negative control: treating the rejection as a closed tab (closed = true in the catch) reddens exactly this test and nothing else; against the pre-fix production shape that logged and swallowed the rejection, the test fails with revertChanges() resolving and the delete running underneath the open tab. Addresses the Regression Evidence row of the pre-merge checklist.
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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.