fix(server): subagent task updates reach Claude task lists

[TonybynMp4]

Claude subagents write to the session's shared task store, but their task-tool results were excluded from the parent plan. Successful subagent mutations now update the same list. Text-only TaskCreate results provide the returned task ID and subject; failed or never-executed calls leave the list unchanged.

Continues @TonybynMp4's work in #20985. Main was merged while preserving the contributor's commits. Separate test and implementation passes retained the existing focused solution after independent inspection; a review fix now rejects unsuccessful text-only TaskUpdate results using the CLI success marker. No new test case or test file was added.

Verification:

• 286 before → 286 after, all passing in the existing ClaudeAdapterV2 test file. The old subagent-exclusion test is replaced by one integrated shared-list regression.
• Exact main production with that regression fails: expected three plan updates, got one. Restored head passes all 286 cases. The test checks a root task completed by a child, a text-only child task created under the same plan ID, returned subject winning over the requested subject, and failed/cancelled updates ignored. The same test now also covers a hook-blocked text-only update without an error flag: it fails before the success-marker guard and passes after it. Before/after proof.
• Existing task-list replacement, deletion, empty-list, unknown-ID and batch-result cases pass. Scoped lint, formatting and server typecheck pass; one existing unused-variable warning and Effect suggestions remain.
• Two parallel adversarial review rounds: round one found the text-only rejected-update gap, now fixed. Both reviewers cleared the full diff in round two.

Live provider proof: Claude CLI 2.1.303 on Sonnet 5.5 ran a disposable parent/child task flow. The child listed and completed the parent task, created a child task, and the parent TaskList showed both changes. The child results were plain strings without structured tool_use_result, matching the adapter fixture. Sanitized actual CLI events. The initial Haiku attempt was rejected by the configured proxy as an unknown model before any task actions.

The adapter proof uses synthetic SDK frames, subagent registration and matched results. The real CLI check confirms provider semantics; browser rendering of the emitted T3 plan was not exercised. There is no layout change; screenshots would not prove SDK normalization. macOS, Windows, iOS, Android, Electron desktop and remote/relay connections were not tested live. Existing shared plan events serve those clients without a contract change.

Implementation and coordination: GPT-6.1 Sol through Codex in T3 Code. Tests: GPT-6 Astra through Codex. Reviews: Claude Opus 5.5 through Claude Code and GPT-6 Sol through Codex.

[macroscopeapp]

Approvability

Verdict: Approved at bcacbaa

Macroscope's review found this PR approvable — This is a localized server bug fix that synchronizes existing Claude task-list projections with successful subagent operations and handles their text-only results. It includes focused coverage for successful, failed, and cancelled calls without changing schemas, defaults, deployment behavior, or static-analysis settings.

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• apps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.test.ts
• apps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.ts

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• apps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.test.ts
• apps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.ts

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📝 Walkthrough

TaskCreate can obtain a task ID and subject from matching result text when structured task fields are absent. Successful executed task-tool results from subagents now update the shared session task list. Errored and cancelled results do not update task state.

Changes: Shared task-list updates

Layer / File(s)	Summary
TaskCreate text fallback apps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.ts, apps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.test.ts	TaskCreate parses the ID and subject from matching success text when structured task fields are absent. Test fixtures cover subagent results without structured output.
Subagent task-list updates apps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.ts, apps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.test.ts	Successful task-tool results update the shared task list for root and subagent calls. Tests verify that errored and cancelled calls do not apply updates.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~12 minutes

Change: Bug fix · Severity of issue fixed: Medium

Sequence Diagram(s)

sequenceDiagram
  participant Subagent
  participant ClaudeAdapterV2
  participant SessionTaskList
  Subagent->>ClaudeAdapterV2: Return executed task-tool result
  ClaudeAdapterV2->>SessionTaskList: Apply task creation or update

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Suggested reviewers: mnigos

Merge Risk: ⚪ Minimal · up to 101c1

Successful subagent task changes can reach the shared task list without applying failed or cancelled calls. No actionable merge-blocking risk remains.

Architecture risk: 🟡 Medium · up to 101c1

The change affects 1 system.

Changed systems: apps/server

Architecture concerns
No architecture-level concerns identified.

Review details

Systems and components

• observed — apps/server (service) was modified; 2 changed files map to changed impact.

Before / after behavior

• observed — Modified behavior in apps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.test.ts: taskToolFrames adds optional nonExecutionKind to its local options type.
• observed — Modified behavior in apps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.test.ts: Tool-result text identifies successful subagent TaskCreate calls by task number and subject; other calls retain the generic completion text. Structured tool_use_result is now omitted for subagent results, and a supplied non-execution kind is encoded in tool_result_meta.
• observed — Modified behavior in apps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.test.ts: The local call helper now derives its options type from taskToolFrames instead of repeating the prior, narrower inline type.
• observed — Modified behavior in apps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.test.ts: The task-tool harness adds launchSubagent, which emits a task_started frame for a tool-use ID before child frames are processed.

Reliability and maintainability

• inferred — Risk-relevant change factors for apps/server: blast_radius_1; blast_radius_2; direct_dependents_1

Pre-merge checks: 4

Check name	Status	Explanation
Linked Issues check		The changes satisfy issue #20986. ClaudeAdapterV2.ts applies successful executed TaskCreate and TaskUpdate results from subagents to the parent task plan. It parses `Task # created successfu…
Out of Scope Changes check		The changes remain within issue #20986. The adapter changes synchronize the shared task list. The test changes verify subagent task results and execution states. No unrelated product behavior appears …
Title check		The title clearly identifies the server fix that makes subagent task updates reach Claude task lists.
Description check		The description explains the problem, implementation, scope context, focused verification, test results, review status, and known limitations. It is mostly complete, although it does not use the templ…

Full details: Linked Issues check

Explanation

The changes satisfy issue #20986. ClaudeAdapterV2.ts applies successful executed TaskCreate and TaskUpdate results from subagents to the parent task plan. It parses Task #<id> created successfully: <subject> when structured task data is absent. It skips failed and non-executed calls. The focused test covers successful subagent updates and the skip cases.

Full details: Out of Scope Changes check

Explanation

The changes remain within issue #20986. The adapter changes synchronize the shared task list. The test changes verify subagent task results and execution states. No unrelated product behavior appears in the reviewed scope.

Full details: Description check

Explanation

The description explains the problem, implementation, scope context, focused verification, test results, review status, and known limitations. It is mostly complete, although it does not use the template headings or explicitly document maintainer approval.

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Actionable comments posted: 1

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• 🪄 Fix comments: Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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Inline comments:
Review comments at
@apps/server/src/orchestration-v2/Adapters/ClaudeAdapterV2.ts:
- Line 3296: Update the created-task handling around claudeCreatedTaskIdFromText
to parse the returned task subject alongside its ID, and use that returned
subject in the parent plan instead of the requested subject.

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[juliusmarminge]

Taking over this one as maintainer for batch claude-03. I will preserve your commits, merge current main where needed, and run separate minimal-test, implementation, and adversarial-review passes before pushing. No merge planned.