feat(task): task-local runtime thinking effort state with per-request override (DTE series 2/5)

[easonLiangWorldedtech]

≤400-line redo of #1338 — DTE series 2/5, unit 3/5

Task-local runtime thinking-effort state on Task: the in-memory override
channel, its per-request delivery at all four createMessage sites, and the
profile-switch re-capture in updateApiConfiguration. Transient state only — nothing is persisted; persistence is the next unit (U4).

Stack

• PR base: upstream main @ 0dbd5846f (cross-fork PR — head easonLiangWorldedtech:feat/dte-v2-3-task-runtime-effort; stack branches live in the fork — no push access to create them here)
• Stack base: feat/dte-v2-2-per-request-effort @ 069c34b9a (U2, upstream PR feat(api): per-request thinking effort override and adaptive effort envelope (DTE series 2/5) #1522, new tip — carries U1's post-main-sync head e89cceddd and the advanced upstream main tip 0dbd5846f merged in)
• Stack sync: first sync f97f8d999 merged U2's tip 18f488fa5 (U1 final CR fixes 53f22dc in); second sync c5b48aa7e merged U2's new tip efbd336e5 (U1's final head 39762bf81 — the last feat(settings): dynamic thinking effort experimental toggle (DTE-1) #1521 CR fix — in); third (main) sync e8c66cfad (this head) merges U2's post-main-sync tip 069c34b9a (upstream main advanced 0d937c050 → 0dbd5846f: v3.82.0 release prep Release v3.82.0 #1533, GPT-6 Astra [Feat] Add verified GPT-6 Astra support across providers #1506, DeepSeek V4 Flash Vision [Feat] Add DeepSeek V4 Flash Vision Exp support #1488, the throwIfAborted helper + completePrompt options regression tests feat(api): add throwIfAborted helper and completePrompt options regression tests #1288, and the async Task.dispose() test-teardown fix [Fix] Unit tests report teardown errors after Task cleanup #1527). One conflict in src/core/task/Task.ts resolved: main's async dispose(): Promise<void> restructure (memoized disposalPromise + disposeOnce()) kept, with U3's 4-line DTE JSDoc above the new dispose(); the test's afterEach now awaits task.dispose() per the repo idiom. Standalone budget 398 at this head (amended to 403 by the CR re-review fix in commit 1edd728c4, then to 418 by the follow-up CR fix in commit 1087fcbd4, see below)
• Content source: feat/dte-trial-all union 27a2e97df (tag dte-legacy/union), U3 slice
• Related: DTE-v2 final ship plan - 39-unit 400-line redo of the DTE series (supersedes #28) easonLiangWorldedtech/Zoo-Code#35 (DTE-v2 tracking ledger)

GitHub's displayed diff vs main is cumulative over the unmerged lower units
(U1 #1521, U2 #1522); the standalone range below is the review target — the displayed number shrinks as they merge. Merge this PR only after its stack
base PR has merged.

Budget (plan §2: a+d ≤400 soft target; ≤1000 hard)

2 files changed, 417 insertions(+), 1 deletion(-) = 418 — soft target 400 exceeded by 18, CR-driven (see the amendments below); hard cap 1000 ✓

File	a+d
src/core/task/Task.ts	102+/1−
src/core/task/__tests__/Task.runtime-thinking-effort.test.ts (new)	315+

Budget deviation note (plan §2.6). The plan estimated U3 at ~355
(Task +132/− + tests ~20); those numbers were stale. Measured against the
union, the U3 slice is Task +105/− + a 311-line test file = 417 > 400. Per
§2.6 (no budget bypass), the dispose boundary group is split into U4:
the task-end override reset (6 Task lines + 3 DTE JSDoc lines) and its
12-line describe("dispose") test block. This matches the plan's own U4 scope
line ("persistence + boundary cases"). U3 keeps the generic 4-line dispose()
JSDoc; U4 expands it with the DTE sentence alongside the reset code.

CR re-review amendment (2026-09-05, review 5120440807). The main-sync
head re-review requested the task-end override reset to live in
disposeOnce() of this unit (so a retained disposed task never serves a stale
override, and the dispose() JSDoc's "resets transient task-local state"
claim is accurate), plus the test afterEach teardown to call
await task.dispose() unconditionally (the !task.abort guard had skipped
disposal of aborted tasks). Both land here in commit 1edd728c4 (+5/−1 ⇒
standalone 398 → 403 — a 3-line overshoot of the soft target, within the 1000
hard cap). Under the split above, U4 loses the reset code it had carried; its
12-line dispose-boundary test block stays with U4 (it now exercises this
unit's reset on the stacked tree).

CR follow-up fix (2026-09-06, review thread comment 3942121231). The
re-review of head 1edd728c4 found that the unconditional field clears in
disposeOnce() left the override behind in apiConfiguration.reasoningEffort
and the built api handler — both are populated by
setRuntimeThinkingEffort, so a retained disposed task could still expose the
override through those copies. Commit 1087fcbd4 replaces the three
assignments with the standard clearing call this.setRuntimeThinkingEffort(undefined) —
which restores apiConfiguration/api from preOverrideReasoningEffort
(read before it is cleared) and then clears the runtime fields — and adds a
14-line describe("dispose") killing-test block asserting the clear and the
restore (Task.ts net +1; standalone 403 → 418 a+d — CR-driven, ≤1000 hard cap).

Provenance / fidelity

• Task.ts: 3-way git merge-file — base 39bdfb188 (= 6ea45b36a^),
  ours = U2 head, theirs = 90b47b053 (the last U3 commit, before the U4
  persistence work). Zero conflicts. A whole-file extract was impossible:
  the union's Task.ts carries U14-orchestrator and U4/U5 content
  (215+/241− vs U1 head), and per-commit git apply --3way of the U3 patches
  fails on upstream base drift.
• Test file: byte-exact 90b47b053 version (311 lines) minus the dispose
  describe (12 lines + separator), plus the 3 mutation-killing assertion
  lines below = 301 lines; the header comment is trimmed to the U3 scope
  ("the task-end reset in dispose()" clause moves with U4).
• U4 content excluded: taskMetadata.ts / history.ts persistence changes,
  the describe("history persistence round-trip") and
  describe("abortTask final save") blocks, and the HistoryItem import
  (unused in the U3 slice).
• src/eslint-suppressions.json: untouched. The union's +21 suppression-count
  deltas vs the stack base are all in files owned by other units
  (gemini-format.spec.ts 5→6, ask-queued-message-drain.spec.ts 18→32,
  newTaskTool.spec.ts 26→31, new extension.ts 1) — none U3-owned.

Out of scope (next units)

• U4 (DTE-2c): persist task thinking effort to history items,
  taskMetadata merge propagation, and the task-end override reset split out
  above (dispose boundary + its test).
• U5 (DTE-2d): the Anthropic output_config.effort adaptive envelope.

Mutation-diff fix (killing assertions, plan L42 — same PR)

The first CI mutation-diff run (head d0b1a3dcd) reported 2 Survived
ConditionalExpression mutants — both on the two ternaries this unit
introduces:

Location	Surviving variant	Fix (this PR)
setRuntimeThinkingEffort source capture: effort === undefined ? undefined : source	replacement: false ⇒ always source: a label passed on a clearing call leaks into source	the clearing call now carries a label (setRuntimeThinkingEffort(undefined, "stale-source")); the existing source: undefined assertion then kills the variant
getRuntimeThinkingEffortMetadata: effort !== undefined ? { reasoningEffort } : {}	replacement: true ⇒ always { reasoningEffort: <maybe undefined> }	key-absence assertion not.toHaveProperty("reasoningEffort") while unset — toEqual({}) cannot kill it (toEqual ignores keys whose value is undefined); asserted pre-set and post-clear

The complementary variants (L1683-true, L1721-false) were already killed by
the existing toBe("test-source") and toEqual({ reasoningEffort: "high" })
assertions.

Local dev-stage gate (skill §5.1) on the latest CR-fix head 1087fcbd4:
node scripts/stryker-diff.mjs ci --base 069c34b9a --head 1087fcbd4 — extension 36 changed lines, 26 valid mutants, 26 Killed, 0 Survived / 0 NoCoverage, exit 0 (previous CR-fix head 1edd728c4: 38 lines, 25/25 Killed).

Verification (local, head 1087fcbd4)

• pnpm --dir src exec eslint --prune-suppressions --max-warnings=0 core/task/Task.ts core/task/__tests__/Task.runtime-thinking-effort.test.ts — exit 0 (re-run on 1087fcbd4; no suppression-count change)
• pnpm check-types — 11/11 projects
• pnpm --dir src exec vitest run core/task/__tests__/Task.runtime-thinking-effort.test.ts — 9/9 (re-run on 1087fcbd4, 4.16 s; includes the new dispose killing test)
• git diff --shortstat 069c34b9a HEAD — 417+/1− = 418 (CR fixes +19/−4 vs 1edd728c4; soft overshoot documented above, ≤1000 hard)
• mutation-diff gate (dev stage, skill §5.1) on 1087fcbd4 — exit 0, 26/26 Killed (see fix above)

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

25-25: LGTM!

Also applies to: 322-328, 1644-1726, 1843-1844, 2613-2616, 2709-2714, 4298-4299, 4526-4527, 4693-4694

src/core/task/__tests__/Task.runtime-thinking-effort.test.ts (1)

1-130: LGTM!

Also applies to: 132-221, 223-283, 285-300, 302-315

---

📝 Summary

Summary by CodeRabbit

• New Features

  • Added an experimental Dynamic Thinking Effort setting, disabled by default.
  • Models can adjust thinking effort per step, while manual chat controls remain available.
  • Added temporary, per-request thinking-effort overrides that take precedence over configured defaults.
  • Active overrides persist when API profiles change and restore configured values when cleared.

• Documentation

  • Added localized setting names and descriptions across supported languages.

• Tests

  • Added coverage for configuration, persistence, runtime overrides, and visual settings displays.

Walkthrough

The PR adds the dynamicThinkingEffort experiment, transient task-level reasoning-effort overrides, effective-effort resolution, request propagation, settings UI coverage, localized labels, and Vitest-related Stryker test discovery.

Changes

Dynamic thinking effort

Layer / File(s)	Summary
Experiment contracts and defaults packages/types/src/experiment.ts, src/shared/experiments.ts, packages/types/src/__tests__/experiment.test.ts, src/shared/__tests__/experiments.spec.ts	Adds the optional experiment ID and schema field. Registers the experiment as disabled by default and tests valid, invalid, enabled, and disabled states.
Reasoning effort resolution src/api/index.ts, src/api/transform/reasoning.ts, src/api/transform/__tests__/dte-effective-reasoning-effort.spec.ts	Adds transient request metadata, adaptive effort values, and precedence resolution from request override to settings value to model default.
Task-local runtime state and request propagation src/core/task/Task.ts, src/core/task/__tests__/Task.runtime-thinking-effort.test.ts	Stores task-local overrides, preserves them across profile changes, restores profile values when cleared, clears them during disposal, and attaches active overrides to API requests.
Experiment settings and localization src/core/webview/..., webview-ui/src/components/settings/..., webview-ui/playwright/gallery/stories.tsx, webview-ui/src/i18n/locales/*/settings.json	Adds settings persistence, webview state handling, UI interaction tests, visual coverage, gallery wiring, and localized setting labels.

Stryker Vitest discovery

Layer / File(s)	Summary
Extension mutation-test discovery scripts/stryker-diff.mjs, scripts/stryker-diff.test.mjs	Enables Vitest-related test discovery for the extension package and updates manifest assertions for the new flags.

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

Merge Risk: ⚪ Minimal · up to 1087f

Task-local thinking-effort overrides now reset during disposal, preventing disposed tasks from retaining stale effort state. No current merge-blocking risk remains.

Sequence Diagram(s)

sequenceDiagram
  participant User
  participant Task
  participant resolveEffectiveReasoningEffort
  participant APIHandler
  User->>Task: setRuntimeThinkingEffort(effort)
  Task->>resolveEffectiveReasoningEffort: pass override, settings effort, and model default
  resolveEffectiveReasoningEffort-->>Task: return effective reasoning effort
  Task->>APIHandler: send request metadata with reasoningEffort
  APIHandler-->>Task: stream API response

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Please resolve all errors before merging. Addressing warnings is optional.

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❌ Failed checks (1 error, 4 warnings)

Check name	Status	Explanation	Resolution
Trust And Persistence Invariants	❌ Error	The new Task.setRuntimeThinkingEffort path leaks provider lifecycle resources. It replaces this.api with buildApiHandler(...) at src/core/task/Task.ts:1705 without disposing the previous handl…	Make API-handler replacement lifecycle-safe. Add an optional disposal contract to ApiHandler, dispose the old handler before replacing it in setRuntimeThinkingEffort and updateApiConfiguration, and dispose the final handler during `Ta…
Linked Issues check	⚠️ Warning	The directly linked issue [#1527] focuses on async disposal, cleanup ordering, provider shutdown, failure isolation, and lifecycle model coverage. This PR primarily adds dynamic thinking-effort state …	Link this PR to the appropriate DTE issue, or include the required #1527 cleanup implementation and deterministic coverage in this PR. Do not rely on stacked or base changes unless the linked issue explicitly accepts that structure.
Out of Scope Changes check	⚠️ Warning	The changes include experiment schemas, reasoning-resolution APIs, Stryker configuration, webview settings, visual fixtures, and localization updates. These changes are unrelated to linked issue [#152…	Remove unrelated DTE experiment, API, Stryker, webview, visual, and localization changes from this PR, or split them into focused PRs linked to the corresponding DTE issues. Update the description to match the actual standalone diff.
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 3 functions across 18 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.
Regression Evidence	⚠️ Warning	The new Task request-metadata behavior lacks focused boundary coverage. Task.ts adds the runtime-effort metadata spread at four request paths (lines 1844, 4299, 4527, and 4694), but `Task.runtime-th…	Add focused Task-level tests at the request boundaries. Set a runtime override and assert metadata.reasoningEffort for attemptApiRequest, the normal context-management path, forced context truncation, and condenseContext; also assert …

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the main change: task-local runtime thinking-effort state with a per-request override.
Description check	✅ Passed	The description is detailed and on topic. It explains the implementation, scope boundaries, related issues, test procedure, verification results, and review amendments. It does not reproduce the templ…

Full details: Linked Issues check

Explanation

The directly linked issue [#1527] focuses on async disposal, cleanup ordering, provider shutdown, failure isolation, and lifecycle model coverage. This PR primarily adds dynamic thinking-effort state and disposal reset behavior; it does not implement or demonstrate the issue's core cleanup requirements. The description states that the async disposal work comes from stacked or base changes.

Full details: Out of Scope Changes check

Explanation

The changes include experiment schemas, reasoning-resolution APIs, Stryker configuration, webview settings, visual fixtures, and localization updates. These changes are unrelated to linked issue [#1527] and exceed the stated two-file task-local scope.

Full details: Regression Evidence

Explanation

The new Task request-metadata behavior lacks focused boundary coverage. Task.ts adds the runtime-effort metadata spread at four request paths (lines 1844, 4299, 4527, and 4694), but Task.runtime-thinking-effort.test.ts only invokes the private getRuntimeThinkingEffortMetadata() helper through a cast (lines 286-299). It never invokes attemptApiRequest, condenseContext, manageContext, or createMessage. The existing Task.spec.ts request test checks only metadata.mode (lines 635-643), not reasoningEffort. Removing any new spread would therefore leave the new focused tests passing. The disposal test also checks apiConfiguration but not that the rebuilt api handler receives the restored effort, although the test mock records those rebuild arguments. The experimental settings change does have a Playwright component snapshot, so that requirement is covered.

Resolution

Add focused Task-level tests at the request boundaries. Set a runtime override and assert metadata.reasoningEffort for attemptApiRequest, the normal context-management path, forced context truncation, and condenseContext; also assert that the field is absent after clearing the override. Extend the disposal test to assert the final buildApiHandler call receives the restored settings-derived effort, confirming that the retained api handler does not keep the disposed override.

Full details: Trust And Persistence Invariants

Explanation

The new Task.setRuntimeThinkingEffort path leaks provider lifecycle resources. It replaces this.api with buildApiHandler(...) at src/core/task/Task.ts:1705 without disposing the previous handler. For providerIdentifiers.vscodeLm, the factory creates VsCodeLmHandler (src/api/index.ts:207-208). Each handler registers a vscode.workspace.onDidChangeConfiguration listener (src/api/providers/vscode-lm.ts:78-87) and exposes dispose() to remove it (:188-197), but ApiHandler has no disposal member and Task does not call it. A VS Code LM task that sets, changes, or clears the runtime effort abandons each prior handler and retains its configuration listener. Disposal can also rebuild a handler at Task.ts:2713 and leave that new handler undisposed.

Resolution

Make API-handler replacement lifecycle-safe. Add an optional disposal contract to ApiHandler, dispose the old handler before replacing it in setRuntimeThinkingEffort and updateApiConfiguration, and dispose the final handler during Task.dispose(); alternatively, avoid rebuilding handlers for runtime-only effort changes and pass the validated effort only through request metadata. Preserve the documented no-mid-stream behavior when selecting the replacement strategy.

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Actionable comments posted: 1

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⚠️ Outside diff range comments (1)

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

2617-2623: 🩺 Stability & Availability | 🟡 Minor | ⚡ Quick win

Clear runtime effort state during disposal.

dispose() calls disposeOnce(), but disposal does not clear runtimeThinkingEffort, runtimeThinkingEffortSource, or preOverrideReasoningEffort. A retained disposed task therefore still returns the old override from getRuntimeThinkingEffort(). Reset these fields in disposeOnce(), or remove the comments that claim disposal resets transient task-local state.

As per path instructions, check persistence and lifecycle invariants, including safe restart/resume without lost or duplicated state.

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In `@src/core/task/Task.ts` around lines 2617 - 2623, Update Task.disposeOnce() to
clear runtimeThinkingEffort, runtimeThinkingEffortSource, and
preOverrideReasoningEffort as part of disposal, ensuring
getRuntimeThinkingEffort() no longer returns stale override state for disposed
tasks while preserving the existing disposalPromise behavior in dispose().

Source: Path instructions

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Inline comments:
In `@src/core/task/__tests__/Task.runtime-thinking-effort.test.ts`:
- Around line 127-128: Update the test teardown to call and await task.dispose()
whenever task exists, removing the !task.abort guard; retain the swallowed
disposal error handling so cleanup completes deterministically for both aborted
and non-aborted tasks.

---

Outside diff comments:
In `@src/core/task/Task.ts`:
- Around line 2617-2623: Update Task.disposeOnce() to clear
runtimeThinkingEffort, runtimeThinkingEffortSource, and
preOverrideReasoningEffort as part of disposal, ensuring
getRuntimeThinkingEffort() no longer returns stale override state for disposed
tasks while preserving the existing disposalPromise behavior in dispose().

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🔇 Additional comments (3)

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

269-269: LGTM!

Also applies to: 417-417, 1143-1208, 1210-1238, 1240-1266

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

25-25: LGTM!

Also applies to: 381-383, 1644-1726, 1843-1844, 2555-2563, 2587-2592, 2675-2679, 2703-2710, 4292-4293, 4520-4521, 4687-4688

src/core/task/__tests__/Task.runtime-thinking-effort.test.ts (1)

1-124: LGTM!

Also applies to: 132-221, 223-283, 285-301

[easonLiangWorldedtech]

Addressed CR re-review 5120440807 in commit 1edd728c4:

1. Task.ts / disposeOnce() (the outside-diff finding): the three DTE fields (runtimeThinkingEffort, runtimeThinkingEffortSource, preOverrideReasoningEffort) are now cleared on disposal, so a retained disposed task never serves a stale override — the dispose() JSDoc's “resets transient task-local state” is accurate.
2. test teardown guard: fixed in-thread (unconditional await task.dispose()).

Standalone budget is now 402+/1− = 403 (3 over the 400 soft target, CR-driven; within the 1000 hard cap) — documented in the Budget section. Local gates on 1edd728c4: check-types 11/11, vitest 8/8, eslint 0, mutation-diff gate 25/25 Killed (extension 38 lines, exit 0).

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⚠️ Outside diff range comments (1)

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

1723-1724: 🎯 Functional Correctness | 🟡 Minor | ⚡ Quick win

Clear runtimeThinkingEffort after the intended request.

getRuntimeThinkingEffortMetadata() is used for normal requests and context-management requests, but runtimeThinkingEffort is cleared only by dispose(). This can apply the same override to later turns, retries, and context-management requests, despite the ApiHandlerCreateMessageMetadata.reasoningEffort contract stating that it applies to the next request only. Clear the override after the intended request, including failure paths, and add regression coverage.

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In `@src/core/task/Task.ts` around lines 1723 - 1724, Update the request flow
using getRuntimeThinkingEffortMetadata so runtimeThinkingEffort is consumed and
cleared after the intended next request, including when that request fails;
ensure retries and context-management requests do not reuse the override, and
add regression coverage for successful and failing request paths.

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Inline comments:
In `@src/core/task/Task.ts`:
- Around line 2709-2712: Update disposeOnce() to restore
preOverrideReasoningEffort into apiConfiguration and rebuild api before clearing
the runtime thinking-effort fields, so retained disposed tasks no longer expose
stale handler configuration. Add a disposal test verifying both
apiConfiguration.reasoningEffort and the rebuilt handler configuration.

---

Outside diff comments:
In `@src/core/task/Task.ts`:
- Around line 1723-1724: Update the request flow using
getRuntimeThinkingEffortMetadata so runtimeThinkingEffort is consumed and
cleared after the intended next request, including when that request fails;
ensure retries and context-management requests do not reuse the override, and
add regression coverage for successful and failing request paths.

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🔇 Additional comments (2)

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

25-25: LGTM!

Also applies to: 322-328, 1644-1722, 1843-1844, 2613-2616, 4297-4298, 4525-4526, 4692-4693

src/core/task/__tests__/Task.runtime-thinking-effort.test.ts (1)

127-127: LGTM!

[easonLiangWorldedtech]

CR re-review follow-up (head 1edd728c4 -> 1087fcbd4).

The re-review of 1edd728c4 raised one new finding (thread comment 3942121231): the unconditional field clears in disposeOnce() left the override behind in apiConfiguration.reasoningEffort and the built api handler - both populated by setRuntimeThinkingEffort, so a retained disposed task could still expose the override through those copies.

Fixed additively in 1087fcbd4: disposeOnce() now calls the standard clearing call setRuntimeThinkingEffort(undefined) (restores apiConfiguration/api from preOverrideReasoningEffort, then clears the runtime fields), plus a 14-line describe("dispose") killing-test block asserting the clear and the restore.

Gates on 1087fcbd4: check-types 11/11, targeted vitest 9/9 (4.16 s), eslint exit 0, mutation-diff (dev stage, vs 069c34b9a) exit 0 - 26 valid mutants, 26 Killed. Standalone 417+/1- = 418 a+d (soft overshoot CR-driven, <=1000 hard). Body updated.