[Fix] Nested subtask tool calls no longer stall by zoomote[bot] · Pull Request #1494 · Zoo-Code-Org/Zoo-Code

zoomote · 2026-09-02T23:00:29Z

What changed

Keeps nested delegation from publishing an empty intermediate task state.
Creates each child from the delegating task's local provider context, including effective mistake limits and organization allow-list validation, while safely falling back when a saved mode profile is stale.
Projects the active child's task-local mode and profile to the webview without mutating shared profile identity.
Serializes completion, scheduler admission, ownership revalidation, and resume invocation through one process-wide parent key so another provider cannot overtake a queued continuation.
Releases parent-key ownership before awaiting the resumed task loop, allowing the resumed parent to delegate again without a scheduler/lock deadlock.
Adds a production-reducer-backed bounded checker and an exact two-provider production-adapter regression covering completion followed by real redelegation.
Clones default provider profiles before updates so a failed persistence attempt cannot mutate later default loads.

Why this change was made

Nested new_task calls could return Zoo Code to the main screen and lose the child execution. Deterministic regression tests reproduced the provider race, and the checker systematically explores bounded interleavings that previously allowed empty publication, duplicate child starts, start-before-commit, scheduler ownership inversion, and stale parent continuations after a newer child commit.

Impact

Nested subtasks transition directly to one child using the correct task-local or explicitly saved mode profile. Concurrent providers in one extension host cannot overtake a pending parent continuation, stale continuations are rejected after ownership refresh, and resumed parents can delegate again without deadlocking the scheduler.

The checker explores 104 distinct states with all 10 actions and 12 landmarks reachable, three distinct profile scenarios, and six deterministic legacy counterexamples. The exact mutation gate passes on 159 changed executable extension lines with no surviving or uncovered mutants; the real two-provider adapter regression, nested extension-host suite, and full repository suite also pass. The model intentionally abstracts the production lock, publication, and semaphore while production-level tests exercise those adapter boundaries; transport timing, scheduler fairness, and cross-process coordination remain outside its bounded scope.

Linked work items

Closes #921.

Adds regression ratchets for #1469 and #1021; their production fixes remain tracked separately.

github-actions · 2026-09-02T23:00:42Z

Review status

This PR was opened by an automated account. A human maintainer must verify the change intent, provenance, and validation before merging.

Current step: Awaiting fresh human maintainer or CODEOWNER approval.

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codecov · 2026-09-02T23:10:45Z

Codecov Report

❌ Patch coverage is 96.20253% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/core/webview/ClineProvider.ts	95.31%	0 Missing and 3 partials ⚠️

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edelauna · 2026-09-03T00:22:31Z

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📝 Summary

Summary by CodeRabbit

Bug Fixes
- Delegated tasks now retain the parent task’s mode and provider settings without changing shared settings.
- Prevented conflicting or duplicate delegations while a child task is still active.
- Improved parent-task resumption after delegated tasks complete, including history and status updates.
- Improved handling of interrupted, cancelled, stale, or failed delegation transitions.
- Task-specific provider settings and limits are applied more reliably during delegation.
- Prevented failed provider-profile saves from altering default settings.
Documentation
- Updated task lifecycle documentation formatting while preserving existing guidance.

Walkthrough

Delegation now passes task-local provider context to children, serializes concurrent transitions, and queues parent resumption after child scheduler release. Tests and model checks cover profile selection, stale state, failures, reentrancy, cross-instance races, and lifecycle invariants.

Changes

Provider handoff refinement

Layer / File(s)	Summary
Explicit child execution context `src/core/webview/ClineProvider.ts`, `src/core/task/providerHandoff.ts`, `src/core/task/Task.ts`, `src/core/task/__tests__/*`, `src/__tests__/ClineProvider.delegation.spec.ts`, `src/core/webview/__tests__/ClineProvider.taskHistory.spec.ts`	Delegation passes mode, API profile name, and provider configuration through `handoffExecutionContext`. Delegated children initialize this context synchronously.
Serialized delegation and scheduler continuation `src/core/webview/ClineProvider.ts`, `src/__tests__/ClineProvider.delegation.spec.ts`, `src/__tests__/helpers/provider-stub.ts`	Delegation starts use shared locks and post-lock state checks. Re-delegation is rejected when the awaited child is invalid. Parent continuation is scheduled after child completion. Webview state and profile validation use task-local configuration.
Parent resumption and lifecycle validation `src/__tests__/ClineProvider.history-resume-delegation.spec.ts`, `src/__tests__/nested-delegation-resume.spec.ts`, `src/eslint-suppressions.json`, `docs/architecture/task-lifecycle-model.md`	Tests validate atomic updates, scheduler ordering, stale-state guards, persistence failures, webview updates, reentrant transitions, and nested resumption. Documentation records the provider handoff and scheduler model.
Lifecycle model checking and configuration isolation `scripts/check-provider-handoff-scheduler.ts`, `package.json`, `src/core/config/ProviderSettingsManager.ts`, `src/core/config/__tests__/ProviderSettingsManager.spec.ts`	The lifecycle model check explores provider handoff and scheduler states, verifies fixed-policy invariants, reports legacy-policy counterexamples, and verifies isolated default profiles.

Estimated code review effort: 4 (Complex) | ~45 minutes

Severity of issue fixed: Medium

Merge Risk: 🟡 Moderate · up to 04f64

Delegated tasks now preserve task-local provider context and validate effective child profiles, but malformed persisted preserve markers with empty profile names may still be accepted. This should be corrected before merge to avoid invalid durable delegation configuration.

Sequence Diagram(s)

sequenceDiagram
  participant ParentProvider
  participant TaskHistoryStore
  participant ChildTask
  participant ParentTask
  ParentProvider->>TaskHistoryStore: serialize delegation start
  ParentProvider->>TaskHistoryStore: validate parent and awaited child
  ParentProvider->>ChildTask: create with handoffExecutionContext
  ChildTask-->>ParentProvider: complete and release scheduler permit
  ParentProvider->>TaskHistoryStore: atomically complete child and reactivate parent
  ParentProvider->>ParentTask: schedule resumeAfterDelegation

🚥 Pre-merge checks | ✅ 7 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Regression Evidence	⚠️ Warning	The new defensive fallback in `ClineProvider.getStateToPostToWebview()` lacks focused coverage. The PR adds a `try/catch` around `currentTask?.taskMode` (head `src/core/webview/ClineProvider.ts:2717-2…	Add a focused test in `src/core/webview/__tests__/ClineProvider.taskHistory.spec.ts` with an active task whose `taskMode` getter throws, while the persisted/global mode has a known value. Assert that `getStateToPostToWebview()` resolves and…

✅ Passed checks (7 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The changes satisfy issue `#921` by preserving the delegating task's local execution context, preventing destination-tab state from controlling child configuration, serializing cross-provider delegation…
Out of Scope Changes check	✅ Passed	The implementation, tests, lifecycle model checker, documentation, scheduler integration, and provider-profile cloning all support delegation consistency, provider handoff, or regression prevention. N…
Security Boundaries	✅ Passed	No concrete changed path meets the security failure condition. In `ClineProvider.createTask`, the handoff configuration is selected as the effective configuration and is checked by `ProfileValidator.i…
Persistence Integrity	✅ Passed	No changed persistence path meets the failure condition. Delegation awaits cache invalidation, parent metadata persistence, API-history saves, and child cleanup; a failed parent atomic update triggers…
Lifecycle Resource Cleanup	✅ Passed	No concrete resource leak or post-cancellation duplicate was introduced. The changed path schedules parent continuation through `TaskScheduler.schedule`; `TaskScheduler` releases its permit in `finall…
Title check	✅ Passed	The title clearly identifies the primary fix: nested subtask tool calls no longer stall.
Description check	✅ Passed	The description explains the issue, implementation, impact, linked issue, and validation results. It does not use every template heading or provide step-by-step test instructions, but the required inf…

Full details: Regression Evidence

Explanation

The new defensive fallback in ClineProvider.getStateToPostToWebview() lacks focused coverage. The PR adds a try/catch around currentTask?.taskMode (head src/core/webview/ClineProvider.ts:2717-2722) so a just-created task that throws before mode initialization falls back to the persisted/global mode. The added projection test at src/core/webview/__tests__/ClineProvider.taskHistory.spec.ts:654-685 covers only a normally initialized task and does not exercise the throwing getter or assert the fallback. The changed error branch therefore has a plausible regression scenario without a focused test.

Resolution

Add a focused test in src/core/webview/__tests__/ClineProvider.taskHistory.spec.ts with an active task whose taskMode getter throws, while the persisted/global mode has a known value. Assert that getStateToPostToWebview() resolves and posts that fallback mode. Retain assertions that the task-local API configuration and profile projection remain correct.

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Inline comments:
In `@src/core/webview/ClineProvider.ts`:
- Line 3907: Update the handleModeSwitch call to pass mode directly, removing
the unnecessary any type assertion while preserving the existing arguments and
preparePendingTask option.

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zoomote · 2026-09-03T00:35:24Z

The production-adapter regression requested by the latest review verdict is added in 04f6422a8.

The test invokes real reopenParentFromDelegation on provider A and real delegateParentAndOpenChild on provider B against one shared stateful history store. It proves provider B cannot remove the parent, commit, or create C2 before A's reserved continuation invokes resume; then verifies real C2 persistence and start remain functional while A's resumed run is still blocked, with commit-before-run ordering and all deferred work settled.

Validation passes: focused adapter/provider tests 38/38 and 54/54; provider model 104 states, 10/10 actions, 12/12 landmarks, 6/6 legacy witnesses; exact mutation gate on 159 changed executable lines with zero blockers; nested extension-host E2E 12/12; full extension suite 8,233 passed and 39 skipped; typecheck, lint, and format green. All 22 accessible CodeRabbit threads remain resolved; no new inline thread required resolution. Remote checks restarted on the pushed head. See task

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Inline comments:
In `@src/core/task/__tests__/Task.spec.ts`:
- Line 690: Update the Task construction in the history-task test to pass
startTask: false, preventing the default resumeTaskFromHistory() from running
asynchronously and mutating provider or persisted-message state after the test
completes.
- Around line 651-674: Strengthen the delegated-child test around Task
construction and message saving: spy on mockProvider.getState and assert it is
never called, then add coverage for handoffExecutionContext.apiConfigName set to
undefined and exercise saveClineMessages to verify the unset profile remains
undefined rather than inheriting provider state. Preserve the existing explicit
handoff assertions and telemetry expectations.

In `@src/core/webview/ClineProvider.ts`:
- Around line 4337-4349: Update the scheduled task callback identified by
reopenParentFromDelegation so failures from
parentInstance.resumeAfterDelegation() are caught inside the custom run. Log the
error through this.log and report the failure to the user, while preserving the
existing delegation-resumed event handling and non-fatal behavior for its
emission failure.
- Around line 3960-3962: Update the delegated task rendering in ClineProvider so
ModeSelector and ApiConfigSelector receive the active currentTaskItem.mode and
currentTaskItem.apiConfigName values rather than global mode/profile state.
Preserve the parent reference and existing task-scoped behavior while ensuring
the child’s controls display its own values.
- Around line 3897-3905: Update the mode profile resolution in the delegation
flow around getModeConfigId and getProfile to catch stale or missing profile
errors, then retain the parent execution context and allow createTask to
continue instead of propagating the failure. Preserve the existing
saved-configuration behavior when getProfile succeeds.

---

Outside diff comments:
In `@src/core/webview/ClineProvider.ts`:
- Around line 3973-3978: Before constructing the child through createTask,
validate the effective delegated configuration, including any mode-specific
profile that replaces handoffExecutionContext.apiConfiguration, against the
organization allow list. Ensure the configuration passed to Task cannot bypass
this validation performed only on getState() output.

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Inline comments:
In `@scripts/check-provider-handoff-scheduler.ts`:
- Around line 89-108: Update PROFILE_SCENARIOS and its execution loop so each
reported scenario represents a distinct input combination: either implement the
stale case through the saved-profile resolution path with a failing lookup, or
remove the unused lookup field and duplicate stale scenario. Ensure the scenario
count matches the cases actually exercised and retain behavior-focused
assertions for selectHandoffExecutionContext.
- Line 334: Add a LEGACY_POLICIES entry that permits parent redelegation before
child permit release, then extend the scheduler validation assertions to run
that policy and expect the “parent redelegated before child permit release”
violation. Keep the existing priorPermitReleased derivation and other policy
checks unchanged, using the existing action and invariant validation flow around
the scheduler policy definitions.

In `@src/__tests__/ClineProvider.delegation.spec.ts`:
- Around line 370-373: Update the stale-profile assertions in the test around
savedProfile and log so they verify a single log call contains both “stale-id”
and “parent parent-1” in the same message, using an exact or behavior-focused
assertion rather than separate matchers that may target different calls.

---

Outside diff comments:
In `@src/core/config/ProviderSettingsManager.ts`:
- Around line 55-112: Update the empty-storage branch of
ProviderSettingsManager.load() to return a fresh deep copy of
defaultProviderProfiles rather than the shared default object. Ensure nested
apiConfigs, modeApiConfigs, and migrations state cannot be mutated by
saveConfig() or persist after a failed store.

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src/core/task/__tests__/Task.spec.ts
src/__tests__/ClineProvider.history-resume-delegation.spec.ts
src/core/webview/__tests__/ClineProvider.taskHistory.spec.ts
scripts/check-provider-handoff-scheduler.ts
src/core/webview/ClineProvider.ts
src/core/task/__tests__/providerHandoff.spec.ts
src/core/task/providerHandoff.ts
src/core/task/Task.ts

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

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Files:

src/__tests__/ClineProvider.delegation.spec.ts
src/core/task/__tests__/Task.spec.ts
src/__tests__/ClineProvider.history-resume-delegation.spec.ts
src/core/webview/__tests__/ClineProvider.taskHistory.spec.ts
src/core/webview/ClineProvider.ts
src/core/task/__tests__/providerHandoff.spec.ts
src/core/task/providerHandoff.ts
src/core/task/Task.ts

Act as an adversarial second-opinion reviewer.

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Files:

docs/architecture/task-lifecycle-model.md
src/__tests__/ClineProvider.delegation.spec.ts
src/core/task/__tests__/Task.spec.ts
src/__tests__/ClineProvider.history-resume-delegation.spec.ts
src/core/webview/__tests__/ClineProvider.taskHistory.spec.ts
scripts/check-provider-handoff-scheduler.ts
src/core/webview/ClineProvider.ts
src/core/task/__tests__/providerHandoff.spec.ts
package.json
src/core/task/providerHandoff.ts
src/core/task/Task.ts

🔇 Additional comments (9)

edelauna · 2026-09-09T19:51:07Z

@CodeRabbit review

coderabbitai · 2026-09-09T19:51:15Z

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edelauna · 2026-09-10T01:14:32Z

@CodeRabbit review

coderabbitai · 2026-09-10T01:14:38Z

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edelauna · 2026-09-10T02:33:14Z

@CodeRabbit review

coderabbitai · 2026-09-10T02:33:20Z

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coderabbitai Bot requested changes Sep 3, 2026

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Comment thread src/core/webview/ClineProvider.ts Outdated

github-actions Bot added the awaiting-author PR is waiting for the author to address requested changes label Sep 3, 2026

github-actions Bot removed the awaiting-author PR is waiting for the author to address requested changes label Sep 3, 2026

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zoomote Bot dismissed coderabbitai[bot]’s stale review via 9b2a1b1 September 3, 2026 03:37

edelauna mentioned this pull request Sep 3, 2026

[BUG] Mutation gate fails pull requests: stale-head checkout and missing root vitest binary #1498

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This was referenced Sep 3, 2026

[Chore] Temporarily validate mutation gate fixes against PR #1494 #1500

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[Chore] Temporarily validate mutation failure diagnostics against PR #1494 #1501

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zoomote Bot force-pushed the fix/nested-subtask-tool-calls-1sa4u4bto3cev branch from 9b2a1b1 to 3494618 Compare September 3, 2026 23:15

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edelauna marked this pull request as ready for review September 5, 2026 00:27

edelauna requested review from JamesRobert20, edelauna, hannesrudolph, navedmerchant and taltas as code owners September 5, 2026 00:27

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roomote added 3 commits September 9, 2026 14:04

fix(delegation): schedule resumed parent after child

8d24c43

test(delegation): include resume path in mutation gate

1b9b032

refactor(delegation): derive resume scheduler label

fad0b74

github-actions Bot added the awaiting-maintainer CodeRabbit approved; waiting for a human maintainer label Sep 9, 2026

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github-actions Bot added awaiting-author PR is waiting for the author to address requested changes and removed awaiting-maintainer CodeRabbit approved; waiting for a human maintainer labels Sep 9, 2026

roomote added 3 commits September 9, 2026 17:18

fix(delegation): model provider handoff interleavings

cb2a569

test(delegation): close handoff mutation gaps

b26ea31

refactor(delegation): reuse normalized profile fallback

4d0261d

github-actions Bot added awaiting-maintainer CodeRabbit approved; waiting for a human maintainer and removed awaiting-author PR is waiting for the author to address requested changes labels Sep 9, 2026

refactor(delegation): simplify task state projection

dcb16f5

coderabbitai Bot requested changes Sep 9, 2026

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Comment thread scripts/check-provider-handoff-scheduler.ts

Comment thread scripts/check-provider-handoff-scheduler.ts

Comment thread src/__tests__/ClineProvider.delegation.spec.ts

fix(delegation): close model and persistence gaps

9968ab1

coderabbitai Bot previously approved these changes Sep 9, 2026

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roomote added 2 commits September 10, 2026 00:08

fix(delegation): serialize parent continuation ownership

f801e27

fix(delegation): release transition before parent run

a8656a7

test(delegation): exercise cross-provider adapters

04f6422

coderabbitai Bot approved these changes Sep 10, 2026

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