fix(delegation): preserve live child delegation links across extension host startup (multi-window subtask return)

[myk1yt]

Related GitHub Issue

Closes: #1469

Related: #1624 (nested-chain delegated-orphan follow-up), #785-adjacent ownership semantics for cross-window task files.

Summary

Preserves live child delegation links across extension host startup when users work in multiple VS Code windows. Previously, when the extension host started in another window, a child task actively running there was misjudged as a crash orphan and repaired, breaking the parent's delegatedToId/awaitingChildId links so completing the subtask failed to return to the parent.

Root Cause

• TaskHistoryStore.reconcileDelegationState() treated any persisted "active" child without a live session as a crash orphan, regardless of whether another extension host was still actively writing its history file.

Changes

Delegation fix core

1. src/core/task-persistence/TaskHistoryStore.ts
   • Live-elsewhere detection: before repairing a persisted-active child, check its history_item.json mtime; a fresh mtime (within LIVE_CHILD_MTIME_THRESHOLD_MS = 5 * 60 * 1000, ≥ the reconcile interval) means the child is live in another window → skip repair and log. getChildFileMtimeMs(childId) returns the mtime (undefined → conservatively repair).
   • Local ownership tracking: locallyActiveTaskIds records tasks this host actively writes; markLocallyActive/markLocallyInactive and the write paths keep it consistent, and reconcile() eviction now also drops evicted ids from the set (fixes the ownership-set leak flagged in review).
2. src/core/webview/ClineProvider.ts — claims/releases local ownership around active task writes so cross-window hosts can distinguish live children from orphans.
3. ClineProvider.markLocallyActive.spec.ts (new) + ClineProvider.flicker-free-cancel.spec.ts — claim/rollback wiring and cancel race coverage.

Lifecycle tests & model hardening (added across review rounds to lock the new semantics)

• TaskHistoryStore.reconciliation.spec.ts (+2,152): live-elsewhere skip, stale-mtime repair, ownership add/remove/eviction, tick-shielding, claim-during-reconcile races.
• scripts/check-task-lifecycle.ts (+204) + src/__tests__/single-open-invariant.spec.ts — model-level invariant checks runnable in CI.
• docs/architecture/task-lifecycle-model.md — invariant 8 narrowed to the boolean live-elsewhere model abstraction (per review).

Reasoning-cleanup coverage (review-driven mutant kills on paths touched by delegation resumes)

• src/core/task/Task.ts type cleanup (+131) with new focused specs: Task.backoffAndAnnounce.retryInfo.spec.ts, Task.buildCleanConversationHistory.reasoning.spec.ts, Task.getCurrentProfileId.spec.ts.
• src/__tests__/helpers/provider-stub.ts, src/eslint-suppressions.json (−10 net suppressions).

Test Procedure

• TaskHistoryStore.reconciliation.spec.ts 50/50 (+ new ownership-eviction regression), attemptCompletionTool.spec.ts 22/22, delegation regression specs (history-resume-delegation / nested-delegation-resume) 23/23, ClineProvider.markLocallyActive.spec.ts (new).
• pnpm lifecycle:model-check passes; tsc --noEmit clean; full lint (13 packages) passes; suppression counts never increased.
• Manual: multi-window provider-switch → subtask complete → parent return verified in the combined VSIX build.

Pre-Submission Checklist

• Issue Linked: Closes [BUG] Cross-window stale subtask completion can orphan a newer child #1469 (cross-window delegation-link preservation).
• Scope: Description covers every changed file grouped by theme; all non-core changes are review-driven hardening of the delegation/lifecycle semantics.
• Self-Review: Performed; all CodeRabbit review rounds addressed (open threads resolved or replied with disposition).
• Testing: New and updated tests cover the changes, including the requested ownership-eviction regression.
• Visual Snapshot: Not applicable (no webview/UI change).
• Documentation Impact: docs/architecture/task-lifecycle-model.md updated (invariant 8 narrowing); no user-facing docs change.
• Contribution Guidelines: I have read and agree to the Contributor Guidelines.

Notes

• Fork branch fix/returntoparent; backups under backup/fix-returntoparent-260903.
• Earlier iterations of this branch briefly carried OpenRouter refresh changes; those were removed — OpenRouter review threads referencing OpenRouter.tsx/openrouter.spec.ts predate that cleanup and track PR fix(openrouter): support extended reasoning efforts and add refresh models button #1369 instead.

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📝 Summary

Summary by CodeRabbit

• Bug Fixes

  • Prevented active tasks in another window from being incorrectly interrupted during startup or periodic recovery.
  • Improved recovery of abandoned delegated tasks by restoring them to an interrupted state when appropriate.
  • Added safeguards against overlapping recovery runs and protected tasks owned by the current window.
  • Improved reliability when resuming tasks, including cleanup when scheduling or preparation fails.
  • Improved retry timing for rate-limit errors using provider-supplied guidance.
  • Improved preservation of reasoning content in conversation history.

• Documentation

  • Updated task lifecycle documentation to describe cross-window activity and stale-task recovery behavior.

Walkthrough

The change adds cross-window liveness tracking for delegated child tasks. Startup and periodic reconciliation now skip recently modified or locally owned children, while stale or unreadable children are repaired. Repair-intent replay uses the same guard, with expanded lifecycle modeling, provider wiring, typing updates, and tests.

Changes

Delegated task recovery

Layer / File(s)	Summary
Cross-window lifecycle model scripts/check-task-lifecycle.ts, docs/architecture/task-lifecycle-model.md	The model tracks liveElsewhere state, adds reconciliation transitions, preserves live delegated children, and validates the ownership invariant.
Child mtime recovery guard src/core/task-persistence/TaskHistoryStore.ts, src/core/task-persistence/__tests__/TaskHistoryStore.reconciliation.spec.ts	Startup reconciliation and repair-intent replay use the five-minute child history-file mtime threshold. Tests cover live, stale, unreadable, boundary, and replay cases.
Periodic repair and local ownership src/core/task-persistence/TaskHistoryStore.ts, src/core/task-persistence/__tests__/TaskHistoryStore.reconciliation.spec.ts	Periodic ticks rerun delegation repair, skip overlapping runs, exclude locally owned active tasks, and maintain ownership across writes, atomic updates, and deletes.
Resumed-task ownership wiring src/core/webview/ClineProvider.ts, src/__tests__/helpers/provider-stub.ts, src/__tests__/single-open-invariant.spec.ts, src/core/webview/__tests__/ClineProvider.flicker-free-cancel.spec.ts, src/core/webview/__tests__/ClineProvider.markLocallyActive.spec.ts	Resumed tasks claim local ownership before their first active-status write. Failed preparation, stack, and scheduling paths release the claim.
Typed task behavior and validation src/core/task/Task.ts, src/core/webview/ClineProvider.ts, src/core/task/__tests__/*	Reasoning history, retry metadata, profile lookup, and provider parameters use explicit types. Tests cover reasoning preservation, retry delays, and profile fallback behavior.

Priority: ⬇️ Low

Estimated code review effort: 4 (Complex) | ~60 minutes

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant ReconciliationTimer
  participant TaskHistoryStore
  participant ChildHistoryFile
  participant RepairIntent
  ReconciliationTimer->>TaskHistoryStore: Start reconciliation tick
  TaskHistoryStore->>ChildHistoryFile: Read child history-file mtime
  ChildHistoryFile-->>TaskHistoryStore: Return mtime or undefined
  alt Child is live elsewhere
    TaskHistoryStore->>RepairIntent: Quarantine repair intent
  else Child is stale or unreadable
    TaskHistoryStore->>TaskHistoryStore: Repair child and restore parent
  end
  TaskHistoryStore-->>ReconciliationTimer: Re-arm periodic tick

Loading

Merge Risk: 🟡 Moderate · up to 657db

Task recovery can still leave an orphaned parent excluded from repair or misclassify a live delegated child in cross-window edge cases. Resolve these recovery-path issues before merging to avoid broken delegation continuity.

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❌ Failed checks (2 errors, 1 warning)

Check name	Status	Explanation	Resolution
Linked Issues check	❌ Error	The required GitHub issue link is missing. The description contains no issue number after “Closes: #”.	Link this pull request to an approved GitHub issue by replacing “Closes: #” with the issue number.
Out of Scope Changes check	❌ Error	The stated objective describes a two-file delegation fix, but the changeset also includes unrelated Task.ts reasoning and typing changes, ClineProvider type-only cleanup, lint-suppression removal, lif…	Remove unrelated changes from this pull request or update the objective and description to justify each additional change as required for the delegation fix.
Lifecycle Resource Cleanup	⚠️ Warning	The new locallyActiveTaskIds ownership state can leak task IDs. upsertCore and markLocallyActive add IDs, while reconcile() removes a missing task only from cache and taskFileMtimes; it do…	When reconcile() evicts a task ID because it is absent from liveIds, also remove that ID from locallyActiveTaskIds. Add a regression test that locally owns an active task, removes its history file through the peer-file path, runs `rec…

✅ Passed checks (5 passed)

Check name	Status	Explanation
Regression Evidence	✅ Passed	PASS — The changed runtime paths have focused coverage at the lowest practical test layer. TaskHistoryStore tests cover recent, stale, exact-threshold, future, missing, transient-error, and lock-windo…
Security Boundaries	✅ Passed	No changed path meets the security-boundary failure conditions. The production changes add task-history mtime checks, local ownership tracking, and scheduler-failure rollback; these only update reconc…
Persistence Integrity	✅ Passed	No changed persistence path meets the failure condition. The new delegation writes and repair-intent writes are awaited and use safeWriteJson; repair intents remain until both task writes and `onWri…
Title check	✅ Passed	The title clearly and concisely describes the main change: preserving live child delegation links across extension-host startup for multi-window task delegation.
Description check	✅ Passed	The description is complete and structured. It links issue #1469, explains the root cause and implementation, lists testing and manual verification, and completes the relevant checklist items. The tem…

Full details: Lifecycle Resource Cleanup

Explanation

The new locallyActiveTaskIds ownership state can leak task IDs. upsertCore and markLocallyActive add IDs, while reconcile() removes a missing task only from cache and taskFileMtimes; it does not remove the ID from locallyActiveTaskIds. If another window deletes the history file, or reconciliation observes a missing file without a live lock, the ID remains owned for the store lifetime. Periodic reconciliation then filters that ID out and can skip orphan repair if the task ID later reappears. This is a changed lifecycle cleanup path in TaskHistoryStore.reconcile().

Resolution

When reconcile() evicts a task ID because it is absent from liveIds, also remove that ID from locallyActiveTaskIds. Add a regression test that locally owns an active task, removes its history file through the peer-file path, runs reconcile(), and verifies that ownership is cleared and a later periodic pass can repair a stale delegated child.

Full details: Out of Scope Changes check

Explanation

The stated objective describes a two-file delegation fix, but the changeset also includes unrelated Task.ts reasoning and typing changes, ClineProvider type-only cleanup, lint-suppression removal, lifecycle-model updates, and additional tests.

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Codecov Report

❌ Patch coverage is 92.54658% with 12 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/core/task-persistence/TaskHistoryStore.ts	87.50%	7 Missing and 1 partial ⚠️
src/core/task/Task.ts	93.02%	0 Missing and 3 partials ⚠️
src/core/webview/ClineProvider.ts	97.95%	0 Missing and 1 partial ⚠️

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Inline comments:
In `@src/api/providers/fetchers/__tests__/openrouter.spec.ts`:
- Line 46: Update the non-reasoning and omitted-supportedParameters test cases
for parseOpenRouterModel to explicitly assert that supportsReasoningEffort is
undefined, while preserving the existing assertion for models supporting
reasoning.

In `@src/core/task-persistence/TaskHistoryStore.ts`:
- Around line 482-487: Update TaskHistoryStore reconciliation around
isLiveElsewhere so stale delegated children are repaired after the grace period
instead of remaining delegated indefinitely: use a cross-window ownership lease
or heartbeat, treat the child as repairable when that signal is absent or
expired, and ensure startPeriodicReconciliation() and the file-watcher path
invoke delegation reconciliation. Add a regression test covering the transition
from recently active to stale and repaired.
- Around line 478-481: The repairActiveDelegation flow must validate and update
the parent and child atomically across hosts: acquire the relevant advisory
locks before reloading both records, then require a readable mtime and recheck
that the child is still active and stale before writing the interrupted state
and clearing parent delegation fields. If locking, reload, mtime retrieval, or
validation fails, defer repair without modifying either record, and add a
regression test covering a peer write between the mtime read and repair.

In `@webview-ui/src/components/settings/providers/__tests__/OpenRouter.spec.tsx`:
- Line 20: Replace the any-typed VSCodeTextField test double with a minimal
explicit props type, and type its event/input value as unknown before narrowing
it to the expected value shape when dispatching extension messages. Preserve the
mock’s existing behavior while restoring compile-time checks at the test
boundary.
- Around line 329-342: Strengthen the “stops listening for messages after
unmount” test by spying on window.addEventListener and
window.removeEventListener, then assert that removeEventListener is called for
the “message” event with the exact handleMessage callback registered by
addEventListener. Keep the existing post-unmount dispatch and DOM assertions.

In `@webview-ui/src/components/settings/providers/OpenRouter.tsx`:
- Around line 66-93: Update the shared router-model response handling used by
ApiOptions and OpenRouter to correlate each response with the request that
initiated it, or serialize concurrent useRouterModels and manual refresh
requests at that boundary. Ensure OpenRouter’s handleMessage only changes
refreshStatus, records errors, and invalidates queries for its own request;
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src/core/task-persistence/__tests__/TaskHistoryStore.reconciliation.spec.ts

[warning] 321-321: Filesystem path is not a string literal; a request-/variable-derived path can enable path traversal. Validate and normalize the path before use.
Context: fs.readFile(childFilePath, "utf8")
Note: [CWE-22] Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal').

(detect-non-literal-fs-filename-typescript)

---

[warning] 324-324: Filesystem path is not a string literal; a request-/variable-derived path can enable path traversal. Validate and normalize the path before use.
Context: fs.readFile(path.join(tmpDir, "tasks", "parent-live", "history_item.json"), "utf8")
Note: [CWE-22] Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal').

(detect-non-literal-fs-filename-typescript)

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src/api/providers/fetchers/openrouter.ts (1)

220-222: 🗄️ Data Integrity & Integration

No compatibility issue is established. ModelInfo accepts boolean | string[] | undefined, and the UI and request helpers already handle both arrays and booleans.

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In `@src/core/task-persistence/TaskHistoryStore.ts`:
- Line 482: Update the live-child mtime check in TaskHistoryStore to allow only
the intended bounded future-clock skew, treating mtimes beyond that bound as
stale instead of active. Preserve normal and short-skew behavior, and add a
regression test covering far-future metadata to verify reconciliation repairs
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GitHub Actions: Changed-code mutation testing / 0_mutation-diff.txt: fix(delegation): preserve live child delegation links across extension host startup (multi-window subtask return)

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##[group]Run node scripts/stryker-diff.mjs ci --base "$BASE_SHA" --head "$HEAD_SHA"
 �[36;1mnode scripts/stryker-diff.mjs ci --base "$BASE_SHA" --head "$HEAD_SHA"�[0m
 shell: /usr/bin/bash -e {0}
 env:
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   STORE_PATH: /home/runner/setup-pnpm/node_modules/.bin/store/v10
   BASE_SHA: b2f63d366f6acd37f7b9226816fdbcda2de05d9b
   HEAD_SHA: 4ebed2e09a37dab4bce84da5c0742cfa3e79dc8b
 ##[endgroup]
 Mutation-testing 1 package(s) from merge base b2f63d366f6a: extension (17 lines)
 ##[error]Survived ArithmeticOperator mutant (replacement: 5 * 60 / 1000). See the job summary for the complete list and resolution guidance.

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GitHub Actions: Changed-code mutation testing / mutation-diff: fix(delegation): preserve live child delegation links across extension host startup (multi-window subtask return)

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##[group]Run node scripts/stryker-diff.mjs ci --base "$BASE_SHA" --head "$HEAD_SHA"
 �[36;1mnode scripts/stryker-diff.mjs ci --base "$BASE_SHA" --head "$HEAD_SHA"�[0m
 shell: /usr/bin/bash -e {0}
 env:
   PNPM_HOME: /home/runner/setup-pnpm/node_modules/.bin
   STORE_PATH: /home/runner/setup-pnpm/node_modules/.bin/store/v10
   BASE_SHA: b2f63d366f6acd37f7b9226816fdbcda2de05d9b
   HEAD_SHA: 4ebed2e09a37dab4bce84da5c0742cfa3e79dc8b
 ##[endgroup]
 Mutation-testing 1 package(s) from merge base b2f63d366f6a: extension (17 lines)
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• src/core/task-persistence/__tests__/TaskHistoryStore.reconciliation.spec.ts

🪛 ast-grep (0.45.2)

src/core/task-persistence/__tests__/TaskHistoryStore.reconciliation.spec.ts

[warning] 376-376: Filesystem path is not a string literal; a request-/variable-derived path can enable path traversal. Validate and normalize the path before use.
Context: fs.readFile(childFilePath, "utf8")
Note: [CWE-22] Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal').

(detect-non-literal-fs-filename-typescript)

---

[warning] 379-379: Filesystem path is not a string literal; a request-/variable-derived path can enable path traversal. Validate and normalize the path before use.
Context: fs.readFile(path.join(tmpDir, "tasks", "parent-live", "history_item.json"), "utf8")
Note: [CWE-22] Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal').

(detect-non-literal-fs-filename-typescript)

🪛 GitHub Check: mutation-diff

src/core/task-persistence/TaskHistoryStore.ts

[failure] 105-105: Mutation test gap
Survived ArithmeticOperator mutant (replacement: 5 * 60 / 1000). See the job summary for the complete list and resolution guidance.

[myk1yt]

Round review disposition (all open threads now resolved):

• locallyActiveTaskIds eviction leak (review 657db15) → fixed in 6d05781: reconcile() eviction now drops the id from the ownership set, with the requested peer-file-removal regression test (fails without the fix).
• OpenRouter threads (4) → not applicable to this PR's current 14-file diff (no webview/OpenRouter changes remain here); dispositioned and tracked on PR fix(openrouter): support extended reasoning efforts and add refresh models button #1369.
• Invariant 8 narrowing → addressed by 4fc47fc.
• Linked-issue / out-of-scope / description findings → PR body rewritten: linked to [BUG] Cross-window stale subtask completion can orphan a newer child #1469 (Closes) and Parent permanently blocked from re-delegation when a nested delegation chain dies with an intermediate child persisted as delegated #1624 (Related), every changed file now grouped by theme with justification, checklist completed.

[myk1yt]

@coderabbitai review — head is now 6d05781. Since the last review: (1) the locallyActiveTaskIds eviction leak is fixed with the requested peer-file-removal regression test; (2) the PR body was rewritten — it now links Closes: #1469, groups all 14 changed files by theme with justification (the Task.ts/ClineProvider/lifecycle changes are review-round hardening of the delegation semantics, not unrelated), and completes the checklist. Please re-run the pre-merge checks against the new head and description.

[coderabbitai]

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