[easonLiangWorldedtech]

U6 — execute() error-path cleanup invariant

Part of the upstream PR 1066 split. Own issue: 1937. Content source of record: 72143527fd33306e5541116093c2cbf803cce9e0..pr-1066-audit).

Why this unit exists: execute() cleanup invariant: the finally around handleError, the writeApproved flag and the consecutive-mistake-counter order. Soft budget overshoot: 439 a+d (single provider group, single gate scope).

Boundaries

• base: e3c10401f
• head: 9b93a6f88
• content source: 72143527fd33306e5541116093c2cbf803cce9e0..pr-1066-audit (local)

Fidelity (machine-verified)

zdt split verify --contract U6.json --worktree <wt> --head 9b93a6f88

Result: PASS — standalone 439 a+d / 2 files (SOFT-OVERSHOOT (rationale required in PR body))

• src/core/tools/WriteToFileTool.ts: OK (content subset of source)
• src/core/tools/__tests__/writeToFileTool.spec.ts: OK (content subset of source)

Budget rationale (soft overshoot): see the deviations list

Design contract

• issue: the split plan

Chain position

Merge order is fixed: U12 (1927) -> U4 -> U5 -> U3 -> U6 -> U7 -> FINAL (1928). This PR is opened against main because 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 (U3), 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)

• Tests: 259 passed / 5 skipped
• changed-line coverage: 14 covered / 0 uncovered — PASS
• ESLint: clean on every touched file; suppression counts unchanged
• No .changeset file, 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 #1937 (unit U6 of the upstream PR 1066 split).

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Round update — Lifecycle Resource Cleanup

Shared root cause behind the Lifecycle Resource Cleanup row (all five units of 1066). handlePartial() registers this task's partial-stream entry — and its TaskAborted listener — before it checks the prevent-focus-disruption experiment. With the experiment enabled the delta returns without ever showing a preview and never reaches execute()'s teardown, so the entry and the listener stay attached for the rest of the task's life, and a streamFailed mark 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 (U6): execute() is already covered by the finally { this.resetTaskPartialState(task) } block, so only the suppressed-preview return in handlePartial() lacked a release; it now has one.

Red first: the new test failed with expected 1 to be +0. Green: 57 passed / 5 skipped. Negative control: removing the release turns exactly that one test red; restored green.

Main refresh. Merged org main 036245c5e (U1 1927). U1's content no longer appears in this diff: 10 files +2048/−45 → 7 files +1593/−40, 0 behind main. Conflicts were confined to src/core/task/__tests__/Task.spec.ts (and Task.ts on U7) — the region U1 rewrote; resolved by taking main's version of the shared save-stage tests (try/finally plus the fixed-task-id ui_messages.json cleanup from cf9206a42) rather than re-implementing U1.

Verification after the merge: Task.spec 172 passed, writeToFileTool.spec 57/5, eslint 0/0.

Scope declared in the split plan

CodeRabbit's Out of Scope Changes row asks to either narrow this PR to the execute() cleanup scope or update the linked split. The plan was updated first, per this chain's planned-and-issued rule - see, comment 6076465965 (2026-10-09), which declares U6's scope at head c6b77fbce. The files outside the execute() cleanup scope are therefore planned, not drift:

• src/core/tools/BaseTool.ts - partial-stream state ownership: the per-task taskPartialStreamState map and its release pair live in BaseTool, so the prevent-focus-disruption release cannot be expressed without touching it.
• src/core/webview/ClineProvider.ts + src/__tests__/removeClineFromStack-delegation.spec.ts - teardown wiring: the shared finalization and the diff-view reset the cleanup path calls are owned there.
• partial-stream lifecycle in handlePartial() - it registers the per-task entry and the TaskAborted listener; releasing that registration is the defect this unit fixes.

Chain merge order: U1 1927 (merged) -> U2 1928 -> U3 1931 -> U4 1929 -> U5 1930 -> U6 1932. The same root cause is fixed once and ported; every port commit cites the source commit.

Rows from the 2026-10-09 review

Two rows in that review need files outside the execute() cleanup set. The scope was extended in the split plan before the fix was pushed: (retired fork tracking item 41).

• Persistence Integrity - DiffViewProvider.revertChanges() must roll the created file and directories back even when open() failed before activeDiffEditor was assigned. Same root cause as 1930; ported verbatim from 7b783452c / 6cae369d9.
• Lifecycle - handlePartial() re-checks that this task's stream entry is still live after each await (provider state, filesystem probe, partial ask, open()).
• Regression Evidence - the missing-content execute() test, same shape as the three on 1929.

Fix commit: 443993e57. Negative controls are one-to-one (each re-check and each release site kills exactly its own test).

Split-unit issue reference

The linked issue 1937 is the approved issue for this change. It is the unit issue filed under the declared split of a larger change: the split plan, the unit boundaries, the approval of the split, and this unit's acceptance criteria are recorded on the tracking issue in this repository: 1989. That tracking issue is also the home for this unit's review dispositions and follow-up registrations. "No approved upstream issue" would only mean the original single-PR change, which was split before any of these PRs opened.

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Stryker directive sweep: removed all three // Stryker disable next-line comments in WriteToFileTool.ts per maintainer directive (mutation-diff is advisory; suppression comments are no longer accepted). Equivalence rationale preserved here:

• ConditionalExpression (path-stabilization check): the !== undefined clause is redundant - when lastSeenPartialPath is undefined the second clause only matches an undefined partialPath, which the !!partialPath in the return value rejects either way.
• AssignmentExpression (commit-point rollback stand-down): the approval flag already stands the rollback down, so removing the assignment changes no observable behaviour today; it stays because this branch lands the write without a diff view and the commit point is the fact that says so.
• LogicalOperator (rollback guard): writeCommitted is the second, independent stand-down - every path that sets it has already set writeApproved, so no test can tell && from || here; it stays because it names the durable fact the provider signals at the save, not the approval fact, and it is the guard that survives if the approval flag moves.
  CR round (Data-Integrity MAJOR, refused-restore save): restorePreStreamBuffer() ignored the boolean from vscode.workspace.applyEdit; a refused edit left the streamed content in the buffer and saveBufferClean() persisted it - unapproved output on disk, worse when the close also failed because discardFileTab() then throws before removeCreatedFile(). The restore now reports whether it applied, the save is gated on it (mirroring discardUnapprovedStream()), the close-failure message distinguishes an un-restored buffer, and the misleading comments are corrected. New focused test mocks applyEdit resolving false and asserts no save plus the filesystem rollback still running (negative control: exactly one red with the fix stashed). Verification: DiffViewProvider suite 99/99, ESLint --max-warnings=0, tsc --noEmit and Prettier clean.

CR round 3 (Data-Integrity MAJOR, close over unconfirmed buffer): the refused-restore guard fixed the save but not the close. Both failure modes now stop the rollback and report it: a refused restore throws before tabGroups.close() (closing the dirty tab would trade the rollback report for a save-confirmation prompt over unapproved content), and saveBufferClean() returns document.save()'s confirmation - an unconfirmed clean state stops the close the same way. The close-failure message no longer needs the restored/un-restored branch. Tests: refused restore -> no close + rollback-failure report; save() resolving false -> no close + report (negative controls: exactly one red each with the fix stashed; the existing refused-close test's save double now resolves true, matching the confirmed-save precondition). Verification: DiffViewProvider suite 100/100, ESLint --max-warnings=0, tsc --noEmit and Prettier clean.

Lint follow-up: upstream main re-enabled @typescript-eslint/no-unused-vars for src, which exposed dead code in this branch on the merge ref. Cleared: the unused stateFor helper in writeToFileTool-partial-state-cleanup.spec.ts, and the default onParameterParseFailure implementation's three ignored parameters in BaseTool.ts now carry the rule's _ prefix (JSDoc updated to match). Focused suites re-run green; ESLint --max-warnings=0, tsc --noEmit and Prettier clean.

Verification at this commit: writeToFileTool suites 79 passed / 5 skipped; tsc --noEmit clean; ESLint --max-warnings=0 clean; Prettier clean (comment-only diff).

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Updated this round (Persistence Integrity check): the walkthrough at the previous head reported that reset() awaited the diff-view close before clearing the session with no finally, so a rejected close left relPath, editType, isEditing and the placeholder ownership behind; the next execution then skipped open(), reused the stale create session, and a later denial's rollback unlinked the path derived from the stale relPath - the file the previous write had approved. All three claims verified real at that head (not stale): the missing finally, the write-path caller that swallows the reset error, and the rollback deleting the relPath-derived path. Fixed: reset() now clears the whole session in a finally while still propagating the close failure, and the rollback deletes only the placeholder this edit owns, snapshotted and cleared before any await. A regression test covers the approved-write, failed-reset, denied-write sequence (negative control: exactly one red with the source fix stashed). DiffViewProvider suite 101 passed; ESLint max-warnings=0 clean with the file's suppression count unchanged; typecheck and Prettier clean.

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Updated this round (main refresh): merged upstream main (8018cba40) into the branch; the merge itself was clean. The merge-ref compile job then flagged six test doubles this branch added to the write-tool spec: main made toolCallId a required member of ToolCallbacks, and those literals predate the change. Added the missing toolCallId to them, matching the value main's own doubles in the same file use. Verification at this merge: typecheck clean; write-tool spec 68 passed / 5 skipped; DiffViewProvider spec 101 passed; ESLint max-warnings=0 clean; Prettier clean.

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Updated this round (re-review follow-ups): three review threads addressed. (1) The modify branch of the rollback no longer returns early when the editor never opened - only the document work is skipped, so the shared preview-tab restore and session reset always run and a failed open cannot leave stale session state behind; the no-editor spec now asserts the session is released (negative control: exactly one red with the fix stashed). (2) The unapproved-stream discard now reuses the shared ENOENT-tolerant file/dir removal helpers instead of inline copies; mutating the shared helper to drop the tolerance turns exactly one existing discard test red, proving the reuse is covered. (3) The delegation spec now asserts the release detaches the registered abort listener with the same function reference, not just the map entry (negative control: deleting the detach call turns exactly that test red). Verification: DiffViewProvider suite 101 passed, delegation suite 24 passed, typecheck clean, ESLint max-warnings=0 clean, Prettier clean.

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Updated this round (Persistence Integrity check, denial path): the new-file rollback reached the delete with the streamed content still in the diff tab's modified side - the tab is a TabInputTextDiff that the file-tab discard does not match, and the diff-view close skips dirty tabs, so the placeholder was unlinked underneath an open dirty buffer one save away from recreating the deleted file. The rollback now restores the modified side to its pre-stream content and confirms a clean save before any tab or file goes, then closes the diff tab and only then unlinks; a refused restore or an unconfirmed save stops the rollback before the close and the delete and propagates. New regression test drives the denial through a dirty TabInputTextDiff and asserts the order restore -> save -> close -> unlink with only the empty pre-stream content ever written (negative control: exactly one red with the source fix stashed); the pre-existing denial test was updated to the restore-then-save contract with its own negative control. Suite 102 passed; typecheck, ESLint max-warnings=0 and Prettier clean.

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Updated this round (Persistence Integrity check, commit path; Regression Evidence warning): saveChanges() awaited the document save without checking its boolean result, so a save resolving false still crossed the commit point - onCommit ran and placeholder ownership was released although nothing had persisted. The commit point now requires a confirmed save; an unconfirmed one throws before onCommit, leaving the uncommitted cleanup state (placeholder still owned) for the execute error path, which already handles a pre-commit saveChanges rejection without reporting success. Both coverage gaps named by the warning are closed: a focused open() test rejects the placeholder write and asserts ownership stays unset while the rollback cleans created directories without unlinking the unowned path, and a clean-document saveChanges() test asserts the commit callback runs and ownership is released without a save. Each new test carries a negative control (exactly one red under the corresponding mutation). Suite 105 passed; typecheck, ESLint max-warnings=0 and Prettier clean.

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Updated this round (Persistence Integrity check, execute path): the execute path conflated approval with a confirmed commit - writeApproved was set before saveChanges(), so a save-confirmation failure before onCommit skipped the discard and reset() cleared the placeholder ownership anyway, stranding the empty placeholder on disk unowned where a later attempt would mistake it for the pre-existing target. The execute path now distinguishes the two: when saveChanges() fails before onCommit, the owned empty placeholder is removed before reset() forgets the ownership (ENOENT-tolerant release), while the dirty editor keeps the approved content for a manual save or retry and the created directories stay in place for that save. New execute-level regression test (save resolving false: no success result, placeholder removed before reset, buffer not discarded) plus provider unit tests for the release, each with a negative control. Suites 176 passed; typecheck, ESLint max-warnings=0 and Prettier clean.

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Updated this round (Persistence Integrity check, placeholder-removal failure): a placeholder removal that rejects (EPERM/EACCES) was logged only, and the cleanup then reset the session anyway - forgetting the ownership and stranding the empty placeholder unowned with no user-visible hazard and no retry path. The execute path now treats a failed removal as a rollback hazard: reset() is skipped so the provider keeps owning the placeholder and the diff session stays open for a retry, and the hazard is reported in the chat like a failed rollback. New execute-level regression test (pre-commit save failure followed by a rejecting removal: failure surfaced, no success result, reset cannot strand the placeholder) plus a unit test pinning that a rejecting unlink preserves ownership, each with a negative control. Suites 178 passed; typecheck, ESLint max-warnings=0 and Prettier clean.

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Updated this round (Persistence Integrity check, rollback ownership): revertChanges() and discardUnapprovedStream() released placeholder ownership up front, before the awaited restore, tab cleanup and unlink - a denied new-file edit whose rollback then failed left the empty placeholder on disk unowned with no hazard and no retry path. Ownership is now released only when the unlink succeeds; execute() skips reset() while the provider still owns a placeholder (new ownsPlaceholder signal) and reports the hazard in the chat, the same discipline as the pre-commit save-failure path. The two coverage gaps the review flagged are closed: handlePartial releases the stream state when the filesystem probe rejects, and a rejecting hazard report is logged without aborting the teardown. Six new tests, each with a negative control (exactly one red). Suites 184 passed; typecheck, ESLint max-warnings=0 and Prettier clean.

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Updated this round (Persistence Integrity check, unconfirmed placeholder save): the stream discard awaited document.save() and ignored a false result - a refused save left the restored buffer dirty while the cleanup still skipped the dirty tab, unlinked the placeholder, and returned success, leaving the buffer one save away from recreating the denied file. The discard now treats false as a rollback failure: it stops before the close and the delete, keeps placeholder ownership so the caller skips the provider reset, and reports the hazard - the same discipline the denial-path rollback already applies to a refused save. Regression coverage: a provider-level false-save test (restore attempted, save refused, nothing closed or deleted, ownership preserved) and the execute-level wiring test (session stays unreset, hazard user-visible); negative control red with the fix stashed. Verification: DiffViewProvider suite 112/112, WriteToFileTool suites green (197 passed, 5 skipped), ESLint max-warnings=0, tsc and Prettier clean. The description's linked-issue section now names the linked unit issue as the approved issue (the earlier "no approved upstream issue exists" sentence contradicted the closing reference and is gone).

---

Test Procedure

1. pnpm --dir src vitest run integrations/editor/__tests__/DiffViewProvider.spec.ts - 112 tests pass, including the refused-save stop (restore attempted, save refused, nothing closed or deleted, placeholder ownership preserved).
2. pnpm --dir src vitest run core/tools/__tests__/writeToFileTool.spec.ts core/tools/__tests__/writeToFileTool-partial-state-cleanup.spec.ts - 197 pass, 5 skipped, including the no-reset wiring for a refused save.
3. Negative control: revert the save-result check in discardUnapprovedStream(); exactly the false-save test reddens.
4. tsc --noEmit and ESLint --max-warnings=0 on the changed files: clean. Earlier rounds' negative controls are one-to-one per their sections above.

Pre-Submission Checklist

• Issue Linked: this PR closes 1937, the unit issue of the approved split recorded on 1989.
• Scope: the changes are focused on the linked issue - the execute error path and the diff cleanup around it.
• Self-Review: the code was reviewed with care; every cleanup branch names its owner.
• Writing Style: short sentences, plain words, active voice.
• Testing: new tests cover each change at the lowest valid layer; each fix names the test that reddens for its negative control.
• No breaking changes: no public API, setting, or webview message changed.

Documentation Updates

No user-facing behavior, setting, or webview surface changed, so no documentation update is needed. The cleanup ownership rules are documented in the code comments at each boundary.

Get in Touch

Discord: easonliang28 - reviewers can also reach the author through this PR.

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Reviewing files that changed from the base of the PR and between 791d03c and 9673079.

Files selected for processing: 2

• src/core/tools/WriteToFileTool.ts
• src/core/tools/__tests__/writeToFileTool.spec.ts

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| If you don't make mistakes, you're not working on hard enough problems. - Frank Wilczek |
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📝 Summary

Summary by CodeRabbit

• Bug Fixes
  • Improved recovery from interrupted file writes by restoring unapproved changes while preserving approved or saved content when later steps fail.
  • Cleared temporary write activity when tasks are cancelled, fail, or are removed from history.
  • Improved parsing-error handling so partial edits are finalized and relevant streaming errors are reported.
  • Improved rollback of new-file edits, including missing files, cleanup failures, and abandoned editor sessions.
  • Ensured new-file directories are created during execution rather than during partial streaming.
  • Prevented stale partial edits and listeners from affecting subsequent tasks.

WriteToFileTool now tracks partial streams per task and handles streaming, parse, cancellation, and execution failures. DiffViewProvider restores streamed buffers and cleans up owned files and directories. Failed-history cleanup clears tool state before task disposal.

Changes: Write failure handling

Layer / File(s)	Summary
Partial-stream state and recovery src/core/tools/BaseTool.ts, src/core/tools/WriteToFileTool.ts, src/core/tools/__tests__/*	BaseTool delegates parse failures to a hook. WriteToFileTool tracks task-scoped stream state, handles cancellation, and cleans up stream and parse failures. Tests cover task isolation, recovery, and cancellation.
Diff-view rollback and artifact cleanup src/integrations/editor/DiffViewProvider.ts, src/integrations/editor/__tests__/DiffViewProvider.spec.ts	DiffViewProvider tracks owned placeholders, restores streamed buffers, confirms saves, and removes owned files and created directories. Tests cover rollback, abandoned streams, save commit points, and cleanup errors.
Write execution and approval-aware cleanup src/core/tools/WriteToFileTool.ts, src/core/tools/__tests__/writeToFileTool.spec.ts	Directory creation occurs during execution. Failure cleanup discards unapproved content, removes an owned placeholder before commitment, and preserves committed content. Tests cover execution errors and direct saves.
Failed-task state teardown src/core/webview/ClineProvider.ts, src/__tests__/removeClineFromStack-delegation.spec.ts	Failed-history cleanup clears WriteToFileTool state before task disposal. Tests verify cleanup ordering and abort-listener removal.

Priority: Normal

Estimated code review effort: 4 (Complex) | ~50 minutes

Change: Bug fix

Merge Risk: Moderate · previous review 791d0

Writes can affect the wrong editor during recovery, and two previously identified placeholder rollback risks remain. Address these paths before merging.

Security Architecture Review

Security architecture risk: 🔵 Low · up to 9b93a

The change strengthens file-write failure recovery while preserving approval checks. Remaining uncertainty concerns recovery when saving messages or restoring files fails.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• observed — The sensitive outcomes remain task-message persistence and filesystem edits made with the extension's existing authority. Write paths can resolve outside the workspace and are represented as such in approval metadata. The changed streaming state is task-instance scoped rather than shared across providers by path.

Trust Boundaries and Controls

• observed — Execution retains the ignore-access check and protected-file approval context. Both direct and editor-backed save paths follow successful askApproval. Setting isAnswered during failure finalization is distinct from the writeApproved flag and does not authorize a save.

Resilience and Maintainability Implications

• observed — Checked normal provider disposal aborts tasks before draining their disposal, allowing the new abort callback to release streaming state. Failed-history cleanup covers the direct-disposal exception explicitly. Task abort and disposal reuse promises, and streaming-state deletion safely tolerates an already-removed entry.

Hardening Proposals

• proposed — Connect the production missing-nativeArgs rejection path to the new teardown boundary. Its existing early exit still bypasses BaseTool.handle, so malformed model output is not universally covered by the added parse-failure cleanup.
• proposed — Give failed rollback and failed terminal-message persistence explicit reconciliation ownership, retaining enough state for actionable recovery. This would strengthen existing best-effort guarantees without treating successful teardown as proof that restoration succeeded.

Pre-merge checks: 8 · 2

Failed checks: 2 warnings

Check name	Status	Explanation	Resolution
Regression Evidence		The changed cleanupFailedPartialStream() branch for a stranded owned placeholder lacks focused coverage. At WriteToFileTool.ts:250-265, when discardUnapprovedStream() rejects and `ownsPlaceholde…	Add focused tests for cleanupFailedPartialStream() and onParameterParseFailure() with ownsPlaceholder: true and a rejected discardUnapprovedStream(). Assert that reset() is not called, the rollback hazard is reported, the stranded…
Lifecycle Resource Cleanup		The changed cancellation path can still duplicate diff cleanup. WriteToFileTool.execute() now enters finally after handleError() rejects and calls discardUnapprovedStream() followed by `reset(…	Add a per-task serialized diff-cleanup owner shared by WriteToFileTool.execute() and task disposal. When cancellation or disposal starts, make execute() await the existing cleanup and skip its own discard/reset, or route both paths thro…

Passed checks: 8 passed

Check name	Status	Explanation
Title check		The title clearly identifies the main change: diff cleanup runs when handleError rejects. The split reference is relevant context.
Description check		The description provides the linked issue, implementation scope, test procedure, verification results, checklist, and documentation assessment. It does not use every template heading exactly, but it i…
Linked Issues check		The PR explicitly closes approved issue #1937 and identifies tracking issue #1989 for the split plan.
Out of Scope Changes check		The additional cleanup and persistence files are explained as planned scope from the split plan. The description also distinguishes U6 work from U7 early-return work.
Linked Issues check		Issue #1937 requires the execute() error path to run diff cleanup in a finally, including when handleError rejects. It also requires the intended writeApproved behavior and consecutive-mistake…
Out of Scope Changes check		The DiffViewProvider changes implement the cleanup target explicitly assigned in issue #1937. Partial-stream release, task-state teardown, rollback ownership, and their tests support the required `e…
Security Boundaries		No changed path introduces a security-boundary failure. WriteToFileTool.execute still validates relPath with validateAccess before writing, and both direct and diff writes occur only after `askA…
Persistence Integrity		No changed persistence path meets the failure condition. The changed save path awaits saveChanges() and saveDirectly(). saveChanges() treats a rejected or false save as uncommitted, and invoke…

Full details: Description check

Explanation

The description provides the linked issue, implementation scope, test procedure, verification results, checklist, and documentation assessment. It does not use every template heading exactly, but it is substantially complete.

Full details: Linked Issues check

Explanation

Issue #1937 requires the execute() error path to run diff cleanup in a finally, including when handleError rejects. It also requires the intended writeApproved behavior and consecutive-mistake-counter order. The reviewed change reports these paths and focused regression tests. The assigned scope re-cut also covers DiffViewProvider rollback, placeholder ownership, refused saves, and cleanup failures. The current source includes confirmed-save commit handling and ownership-preserving rollback logic. Reported verification is green for the write-tool and diff-provider suites, typecheck, ESLint, and split verification.

Full details: Out of Scope Changes check

Explanation

The DiffViewProvider changes implement the cleanup target explicitly assigned in issue #1937. Partial-stream release, task-state teardown, rollback ownership, and their tests support the required execute() cleanup invariant. BaseTool.ts and ClineProvider.ts are cumulative prior-unit files that issue #1937 explicitly excludes from U6 ownership. No unrelated change is demonstrated by the reviewed evidence.

Full details: Security Boundaries

Explanation

No changed path introduces a security-boundary failure. WriteToFileTool.execute still validates relPath with validateAccess before writing, and both direct and diff writes occur only after askApproval returns approval. Changed cleanup paths discard unapproved content and remove only tracked placeholders. No changed code leaks secrets or PII or executes unvalidated input.

Full details: Persistence Integrity

Explanation

No changed persistence path meets the failure condition. The changed save path awaits saveChanges() and saveDirectly(). saveChanges() treats a rejected or false save as uncommitted, and invokes the commit callback only after confirmed persistence. Error cleanup awaits buffer restoration, placeholder removal, directory removal, and reset, while retaining ownership when cleanup fails. The direct fs.writeFile calls were already present in the base revision, so the PR does not introduce a new non-atomic write.

Full details: Regression Evidence

Explanation

The changed cleanupFailedPartialStream() branch for a stranded owned placeholder lacks focused coverage. At WriteToFileTool.ts:250-265, when discardUnapprovedStream() rejects and ownsPlaceholder is true, the code must skip reset() and call both rollback-hazard reports. The direct helper tests only use tasks without ownsPlaceholder, so that value is undefined and they cover only the reset/report-revert branch. The execute-path tests set ownsPlaceholder, but they do not invoke cleanupFailedPartialStream() and therefore do not cover this partial-stream/early-cleanup behavior.

Resolution

Add focused tests for cleanupFailedPartialStream() and onParameterParseFailure() with ownsPlaceholder: true and a rejected discardUnapprovedStream(). Assert that reset() is not called, the rollback hazard is reported, the stranded-placeholder hazard is reported, and task stream state is released. Keep the existing ownsPlaceholder: false tests for the normal rollback-failure branch.

Full details: Lifecycle Resource Cleanup

Explanation

The changed cancellation path can still duplicate diff cleanup. WriteToFileTool.execute() now enters finally after handleError() rejects and calls discardUnapprovedStream() followed by reset() at src/core/tools/WriteToFileTool.ts:562-602. During that await, production handleError can reject because Task.say() observes abort (src/core/task/Task.ts:2692-2707). Task.abortTaskOnce() emits TaskAborted and starts disposal; disposal independently calls diffViewProvider.revertChanges() at src/core/task/Task.ts:3510-3518,3632-3642. The new abort listener only removes the partial-state entry (WriteToFileTool.ts:100-126); it does not serialize or claim the provider cleanup. A streamed task that aborts while rejected handleError() is pending can therefore run discardUnapprovedStream()/reset() and revertChanges() concurrently, causing duplicate editor, buffer, tab, or filesystem cleanup. The added rejection test uses a mock handleError and does not exercise task disposal.

Resolution

Add a per-task serialized diff-cleanup owner shared by WriteToFileTool.execute() and task disposal. When cancellation or disposal starts, make execute() await the existing cleanup and skip its own discard/reset, or route both paths through one idempotent cleanup promise. Serialize provider, editor, and filesystem operations before releasing partial-stream state. Add an integration test that aborts during rejected handleError() and verifies one cleanup sequence.

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Review-state labels are managed by this workflow; do not edit them manually. community-approved is managed the same way — do not add or remove it manually. It signals a fresh community code approval for the current head as an advisory priority only; maintainer review is still required.

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Codecov Report

❌ Patch coverage is 90.43210% with 31 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/integrations/editor/DiffViewProvider.ts	89.26%	6 Missing and 10 partials ⚠️
src/core/tools/WriteToFileTool.ts	92.12%	2 Missing and 11 partials ⚠️
src/core/tools/BaseTool.ts	88.88%	0 Missing and 1 partial ⚠️
src/core/webview/ClineProvider.ts	0.00%	1 Missing ⚠️

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Actionable comments posted: 1

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Review comments at @src/core/tools/WriteToFileTool.ts:
- Around line 403-404: Ensure `execute()` resets per-task stream state on every
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🔇 Additional comments (10)

src/core/task/Task.ts (1)

1681-1742: LGTM!

Also applies to: 2735-2784

src/core/task/__tests__/Task.spec.ts (2)

5927-6148: LGTM!

Also applies to: 6248-6323

---

6204-6245: 📐 Maintainability & Code Quality

The cross-file directory race is unsupported.

The inspected spec-file search found this fixed task UUID and its uuid.v7 mock only in Task.spec.ts. Other specs use the same storage root, but that does not establish that they write to the directory this test removes.

src/core/assistant-message/__tests__/presentAssistantMessage-custom-tool.spec.ts (1)

92-92: LGTM!

src/core/tools/BaseTool.ts (1)

158-174: LGTM!

Also applies to: 183-201

src/core/tools/WriteToFileTool.ts (1)

381-402: LGTM!

src/core/tools/__tests__/writeToFileTool.spec.ts (1)

1247-1290: LGTM!

src/core/tools/__tests__/writeToFileTool-partial-state-cleanup.spec.ts (1)

1-100: LGTM!

src/__tests__/removeClineFromStack-delegation.spec.ts (1)

212-250: LGTM!

src/core/webview/ClineProvider.ts (1)

640-644: LGTM!

[easonLiangWorldedtech]

Correct for this unit in isolation — and it is exactly what the sibling unit U7 (#1928
p1066/u7-early-return-denial-cleanup) adds. In that branch, each of the three early returns calls the
teardown before returning:

• missing path: finalizePartialToolAskAfterFailure → revertDiffChangesBeforeReset →
  resetDiffViewAfterWrite → this.resetTaskPartialState(task) → return
• missing content: same four calls
• .rooignore denial: same four calls

This PR (#1932, U6) only moves the finally cleanup so it also runs when handleError() rejects, so the
state the finding describes is left behind here. The split keeps each unit to one behaviour change; U7 is
the unit that owns the early-return teardown, and the chain is merged as a set (U1 → U7). Nothing to add
in this diff without duplicating U7.

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[easonLiangWorldedtech]

Persistence Integrity (Error) - third finding at the new head; fixed.

The claim verified true: execute() sets writeApproved = true before calling saveChanges(), so when the new save-confirmation gate threw before onCommit, the catch skipped the unapproved-stream discard (correctly - the content is the user's accepted edit) but reset() then cleared placeholderPath and createdDirs anyway: the empty placeholder stayed on disk unowned, a later attempt would treat it as the pre-existing target, and a later denial's rollback no longer recognized it. Approval was being conflated with a confirmed commit.

Fixed per the Resolution's first option, scoped to the placeholder: when saveChanges() fails before onCommit, the execute path now removes the owned empty placeholder (new DiffViewProvider.discardOwnedPlaceholder(), ENOENT-tolerant like the other rollback deletes) BEFORE reset() clears the ownership, while the dirty editor keeps the approved content for a manual save or retry - the created directories are deliberately left in place because that save needs them. A failed placeholder removal is logged, matching the file's other cleanup helpers.

Regression coverage as demanded: an execute-level test drives save() resolving false (saveChanges throwing before the commit callback) and verifies no success result (handleError, no write result pushed), the buffer is NOT discarded, and the placeholder removal happens before reset (order assertion). Provider unit tests cover the release itself: unlink + ownership release, no-op without ownership, ENOENT tolerance. Each new test carries a negative control (exactly one red with the corresponding source change stashed).

Suites 176 passed (5 pre-existing skips); typecheck, ESLint max-warnings=0 and Prettier clean. CI pending at comment time.

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[easonLiangWorldedtech]

Persistence Integrity (Error) - fourth finding at the new head; fixed.

The claim verified true at 346ee8b: the false-save cleanup removed the owned placeholder before reset(), but a removal that rejects (EPERM/EACCES) was only logged (WriteToFileTool.ts:181-187), and the surrounding cleanup always called reset() (:518-523), which clears placeholderPath (DiffViewProvider.ts:1460-1477) - stranding the empty placeholder unowned with no user-visible hazard and no retry path.

Fixed per the Resolution: the placeholder-removal failure is now a reported rollback hazard, and the owned state is preserved until removal succeeds - the execute path skips reset() when the removal fails, so the provider still owns the placeholder and the diff session stays open for a retry, and the hazard is reported in the chat the same way a failed rollback is (reportPlaceholderStranded). discardOwnedPlaceholder() already preserved placeholderPath across a rejecting unlink; a new unit test pins that contract (mutation probe: releasing ownership before the unlink turns exactly one test red). The demanded execute-level regression test drives pre-commit save failure followed by a rejecting discardOwnedPlaceholder() and verifies the failure is surfaced (chat error naming the placeholder, plus the console line), no success result is pushed, and reset() does not run - so it cannot silently strand the placeholder as unowned (negative control: exactly one red with the source fix stashed).

Suites 178 passed (5 pre-existing skips); typecheck, ESLint max-warnings=0 and Prettier clean. CI pending at comment time.

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Actionable comments posted: 1

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Inline comments:
Review comments at @src/core/tools/WriteToFileTool.ts:
- Around line 541-559: Before the outer try in WriteToFileTool’s write flow,
reject a requested path that differs from the path of an active retained
DiffViewProvider session; ensure this rejection cannot trigger cleanup that
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🔇 Additional comments: 4

src/core/tools/WriteToFileTool.ts: 2

535-557: Report a stranded placeholder even when no revert ran.

In the writeApproved && !writeCommitted branch, reverted stays true. The else if (strandedPlaceholder) branch therefore runs, and the report is reached. The two flags cannot both be set in one pass, because they come from exclusive branches. Skipping reset() keeps placeholderPath and the diff session, as the provider test documents.

One residual effect is out of scope for this PR: execute() and handlePartial() both reuse a non-reset editType of "create", and the retry depends on that value. Ownership is preserved, so this matches the stated intent.

---

185-217: LGTM!

src/core/tools/__tests__/writeToFileTool.spec.ts: 1

1443-1472: LGTM!

src/integrations/editor/__tests__/DiffViewProvider.spec.ts: 1

1254-1265: LGTM!

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Persistence Integrity (Error) - fifth finding at the new head; fixed. Regression Evidence (Warning) - both named coverage gaps closed.

The claim verified true at e61e004: revertChanges() snapshotted placeholderPath and cleared it before any await (src/integrations/editor/DiffViewProvider.ts:727-728), so a denied new-file edit whose rollback then failed - refused restore (:758-767) or EPERM unlink (:780-782) - left the empty placeholder on disk with ownership already forgotten; execute()'s cleanup ran over the top of it and reset() cleared the session, stranding the file unowned with no hazard reported and no retry path.

Fixed per the Resolution: ownership is released only when the artifact removal succeeds. revertChanges() (and discardUnapprovedStream(), which had the same up-front clear) now keep placeholderPath set until removeCreatedFile lands, releasing it immediately after the unlink so a later directory failure cannot strand an ownership whose file is gone; the created-directory state likewise survives a failed rollback. execute() checks the provider's new ownsPlaceholder signal in its finally and skips reset() while the placeholder remains owned - the same discipline as the pre-commit save-failure path - and reports the hazard in the chat. The demanded execute-level regression test drives a denied new-file edit whose rollback and discard both reject EPERM and verifies the placeholder stays owned, reset is not called, and the hazard is user-visible (negative control: exactly one red with the tool fix stashed). Three provider tests pin the ownership contract (failed unlink keeps it, successful unlink releases it before the directory loop, discard keeps it too; negative controls via source stash and a release-ordering mutation, each exactly one red).

Regression Evidence (Warning): both omitted negative paths now have focused tests - a filesystem-probe rejection during a stabilized partial delta releases the stream state and abort listener and still reaches handleError (negative control: removing the boundary release turns exactly one test red), and the stranded-placeholder test variant rejects task.say() and verifies the failure is logged, handleError still ran, and the session stays unreset (negative control: dropping the report's catch turns exactly one test red).

Suites 184 passed (5 pre-existing skips); typecheck, ESLint max-warnings=0 and Prettier clean. CI pending at comment time.

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Inline comments:
Review comments at @src/core/tools/WriteToFileTool.ts:
- Around line 541-545: Update cleanupFailedPartialStream() and
onParameterParseFailure() to skip resetDiffViewAfterWrite() when cleanup fails
and task.diffViewProvider still owns the placeholder; preserve that ownership
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📓 Common learnings

Learnt from: easonLiangWorldedtech
Repo: Zoo-Code-Org/Zoo-Code PR: 1932
File: src/core/tools/WriteToFileTool.ts:312-318
Timestamp: 2026-10-10T05:02:49.492Z
Learning: In src/core/tools/WriteToFileTool.ts, resetting DiffViewProvider clears bookkeeping but does not restore dirty streamed content. Cleanup of an unapproved partial write must call discardUnapprovedStream() before reset(). cleanupFailedPartialStream() performs this sequence and reports a warning if discard fails.

🔇 Additional comments: 4

src/core/tools/WriteToFileTool.ts: 1

558-559: LGTM!

src/core/tools/__tests__/writeToFileTool.spec.ts: 1

645-678: LGTM!

Also applies to: 1507-1562

src/integrations/editor/DiffViewProvider.ts: 1

577-586: LGTM!

Also applies to: 638-640, 706-706, 736-739, 791-795

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1335-1391: LGTM!

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Actionable comments posted: 3

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Inline comments:
Review comments at @src/core/tools/__tests__/writeToFileTool.spec.ts:
- Line 1567: Update the test covering reportRevertFailure() to assert separately
that both the placeholder warning and the unapproved-editor-content warning are
reported, so the test fails if either warning is missing.

Review comments at @src/integrations/editor/DiffViewProvider.ts:
- Around line 688-690: Update the save-refusal path following
discardUnapprovedStream() so a false save result does not lose this.createdDirs:
retain the directory list until artifact cleanup succeeds, or restore it before
throwing, allowing a later successful retry to clean up the created directories.
- Around line 705-706: Update the active-session handling in DiffViewProvider
and WriteToFileTool.execute so a retained editing session cannot be used to
write a different path after document.save() fails; reject the mismatched path
until rollback succeeds or the retained session is resolved, while preserving
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Learnt from: easonLiangWorldedtech
Repo: Zoo-Code-Org/Zoo-Code PR: 1932
File: src/core/tools/WriteToFileTool.ts:312-318
Timestamp: 2026-10-10T05:02:49.492Z
Learning: In src/core/tools/WriteToFileTool.ts, resetting DiffViewProvider clears bookkeeping but does not restore dirty streamed content. Cleanup of an unapproved partial write must call discardUnapprovedStream() before reset(). cleanupFailedPartialStream() performs this sequence and reports a warning if discard fails.

🔇 Additional comments: 1

src/integrations/editor/__tests__/DiffViewProvider.spec.ts: 1

2591-2592: LGTM!

Also applies to: 3013-3013

[easonLiangWorldedtech]

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Actionable comments posted: 3

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• 🪄 Fix comments: Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at @src/core/tools/WriteToFileTool.ts:
- Around line 370-372: Update the retained-error message in WriteToFileTool so
it instructs the model to retry writing to retainedPath first, allowing the
unfinished session to finish or be discarded before retrying relPath; leave the
existing error context and test-matching text unchanged.
- Around line 367-375: Update the retained-path early return in execute to call
resetTaskPartialState(task) immediately before returning, without invoking
cleanupFailedPartialStream(), so the retained session remains intact while
per-task stream state is released. Extend the test for rejecting a different
path during a retained session to assert that mockCline.off receives the
registered TaskAborted listener reference.
- Line 366: The streaming path in handlePartial must reject a different editing
path before any partial ask or diff-view update occurs. After path
stabilization, call isEditingDifferentPath with relPath; when it returns true,
reset the task’s partial state and return without opening or updating the diff
view. Add a handlePartial test covering a retained session for another path and
asserting update is not called.

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Reviewing files that changed from the base of the PR and between 030218f and 791d03c.

📒 Files selected for processing: 3

• src/core/tools/WriteToFileTool.ts
• src/core/tools/__tests__/writeToFileTool.spec.ts
• src/integrations/editor/DiffViewProvider.ts

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Treat model, provider, MCP, path, command, and tool data as untrusted.

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• src/core/tools/WriteToFileTool.ts
• src/core/tools/__tests__/writeToFileTool.spec.ts

Require regression coverage at the lowest valid harness with behavior-focused assertions, including relevant negative, error, false/unset, and boundary cases.

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• src/core/tools/__tests__/writeToFileTool.spec.ts

Check strict typing and exhaustive behavior across normal, boundary, error, cancellation, retry, and compatibility paths.

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Files:

• src/integrations/editor/DiffViewProvider.ts
• src/core/tools/WriteToFileTool.ts
• src/core/tools/__tests__/writeToFileTool.spec.ts

Verify extension/webview contracts, cancellation and error propagation, VS Code lifecycle correctness, and behavior under retries and partial failure.

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• src/integrations/editor/DiffViewProvider.ts
• src/core/tools/WriteToFileTool.ts
• src/core/tools/__tests__/writeToFileTool.spec.ts

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Files:

• src/integrations/editor/DiffViewProvider.ts
• src/core/tools/WriteToFileTool.ts
• src/core/tools/__tests__/writeToFileTool.spec.ts

🔇 Additional comments: 6

src/core/tools/WriteToFileTool.ts: 2

252-265: LGTM!

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298-312: LGTM!

src/core/tools/__tests__/writeToFileTool.spec.ts: 2

169-173: LGTM!

---

1571-1581: LGTM!

src/integrations/editor/DiffViewProvider.ts: 2

587-608: LGTM!

---

729-732: LGTM!

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