fix(cursor): map ACP updateTodos tool calls onto the Tasks panel

[bompus]

What Changed

Cursor ACP updateTodos / TodoWrite tool calls now update the Tasks panel.

Cursor CLI does not send cursor/update_todos. It emits a generic ACP tool call whose rawInput looks like:

{
  "_toolName": "updateTodos",
  "todos": [{ "content": "…", "status": "TODO_STATUS_IN_PROGRESS" }]
}

That used to become a tool card only. The adapter now reuses extractTodosAsPlan and emits turn.plan.updated. Status values such as TODO_STATUS_COMPLETED and TODO_STATUS_IN_PROGRESS map to completed / inProgress.

Why

The Tasks panel already listens for turn.plan.updated. OpenCode, Claude, and Codex already reach that path. Cursor ACP never did, so the panel stayed empty even when TodoWrite succeeded.

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

No UI chrome change; the panel already rendered turn.plan.updated. Proof: vp test run apps/server/src/provider/acp/CursorAcpExtension.test.ts (9 passed) and vp test run apps/server/src/provider/Layers/CursorAdapter.test.ts (22 passed), plus targeted lint and vp run --filter t3 typecheck.

Summary by CodeRabbit

• New Features

  • Cursor task updates can be translated into session plans.
  • Supported todo formats are recognized and displayed as plan steps, including completed, in-progress, and failed statuses.

• Bug Fixes

  • Plans are emitted only after task updates complete, preventing failed, cancelled, or in-progress operations from creating premature plans.
  • Invalid, empty, or unrelated todo data no longer produces incorrect plan updates.

• Tests

  • Added coverage for todo parsing, status mapping, and session plan update behavior.

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• apps/server/scripts/acp-mock-agent.ts
• apps/server/src/provider/Layers/CursorAdapter.test.ts
• apps/server/src/provider/Layers/CursorAdapter.ts

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📝 Walkthrough

Walkthrough

The Cursor adapter now converts updateTodos and TodoWrite tool calls into normalized turn.plan.updated events. It emits plans only for completed tool calls. The mock agent and tests cover completed, failed, and in-progress statuses.

Changes

Cursor todo plan propagation

Layer / File(s)	Summary
Todo extraction and status normalization apps/server/src/provider/acp/CursorAcpExtension.ts, apps/server/src/provider/acp/CursorAcpExtension.test.ts	The extension validates Cursor todo inputs, accepts updateTodos and TodoWrite, normalizes todo statuses, and returns non-empty plans. Tests cover valid and invalid inputs.
Adapter plan update emission apps/server/src/provider/Layers/CursorAdapter.ts	CursorAdapter extracts plans from tool-call updates and emits session/update plan events only when the tool call is completed.
Mock agent todo emission and integration validation apps/server/scripts/acp-mock-agent.ts, apps/server/src/provider/Layers/CursorAdapter.test.ts	The mock agent emits Cursor todo tool calls with configurable statuses. The integration test verifies plan events for completed calls and no plan events for failed or in-progress calls.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant MockAgent
  participant CursorAdapter
  participant CursorAcpExtension
  participant RuntimeEvents
  MockAgent->>CursorAdapter: emit updateTodos tool call
  CursorAdapter->>CursorAcpExtension: extract todos plan from rawInput
  CursorAcpExtension-->>CursorAdapter: return normalized plan
  CursorAdapter->>RuntimeEvents: emit turn.plan.updated for completed status

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Suggested reviewers: juliusmarminge

Merge Risk: ⚪ Minimal · up to 38737

The todo propagation change is ready to merge under the repository’s current lint and test contracts.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 14.29% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 7 functions across 5 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description explains what changed and why, identifies the Cursor ACP input format, documents status mapping, confirms that no UI changes are included, and lists validation results. The required in…
Title check	✅ Passed	The title clearly and concisely describes the main change: mapping Cursor ACP updateTodos tool calls to the Tasks panel.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

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Inline comments:
In `@apps/server/src/provider/Layers/CursorAdapter.ts`:
- Line 874: Update the todosPlan handling in CursorAdapter so turn.plan.updated
is emitted only when the ACP tool call has completed successfully; skip
in-progress, failed, and cancelled updates while preserving deduplication for
completed updates.

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📒 Files selected for processing (5)

• apps/server/scripts/acp-mock-agent.ts
• apps/server/src/provider/Layers/CursorAdapter.test.ts
• apps/server/src/provider/Layers/CursorAdapter.ts
• apps/server/src/provider/acp/CursorAcpExtension.test.ts
• apps/server/src/provider/acp/CursorAcpExtension.ts

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[bompus]

Related prior art: discussion #6998 (converted from issue #6644) covers Cursor subagent visibility in the Agents panel. This PR is the updateTodos/TodoWrite half of that gap; #11214 covers the native Task children half.

[juliusmarminge]

Thanks for the PR. We're not taking changes to the orchestration and provider layers right now: that part of the server is being rewritten for V2, and merging into the current code would either conflict with or be thrown away by that work.

Closing for now. If this is still an issue once V2 lands, please reopen (or open a fresh PR against the new code) and we'll take a proper look.