fix(parser): treat Agent tool as subagent spawn (Task renamed in CC 2.1.63)

[axisrow]

Fixes #237

Summary

Claude Code 2.1.63 renamed the subagent-spawning tool from Task to Agent (docs: "In version 2.1.63, the Task tool was renamed to Agent"). The settings alias keeps old Task(...) references working, but session JSONL records the new name — so extractToolCalls marked zero subagent spawns in modern sessions, silently dropping task descriptions and breaking ProcessLinker linking.

The fix accepts both names. The input schema (description, prompt, subagent_type) is unchanged per docs, so the existing extraction right below the changed line works as-is. The subagents/agent-{id}.jsonl transcript layout is already handled by SubagentLocator.

Validation checklist

• pnpm typecheck
• pnpm lint (0 errors)
• pnpm test (724 passed, +2 new: Agent-named blocks extract isTask/taskDescription/taskSubagentType; legacy Task unchanged; regular tools stay non-task)
• Verified against a real modern session: 11 Agent blocks, 0 Task — after the fix all spawn links resolve

🤖 Generated with Claude Code

Summary by CodeRabbit

• Bug Fixes
  • Recognize both the current Agent tool name and the legacy Task name as subagent calls.
  • Preserve descriptions and subagent types for recognized calls.
  • Continue treating regular tools, such as Bash, as non-task calls.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: e32d655f-decf-454b-9fea-27ec88947cc0

📥 Commits

Reviewing files that changed from the base of the PR and between 16cc3c8 and 5c8af3e.

📒 Files selected for processing (2)

• src/main/utils/toolExtraction.ts
• test/main/utils/toolExtraction.test.ts

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📝 Walkthrough

Walkthrough

Changes

Subagent tool recognition

Layer / File(s)	Summary
Parser recognition and validation src/main/utils/toolExtraction.ts, test/main/utils/toolExtraction.test.ts	extractToolCalls now treats Agent and Task blocks as subagent calls. Tests verify task metadata for both names and confirm that Bash remains a regular tool.

Suggested labels: bug, documentation

Priority: ➖ Normal

Change: Bug fix · Severity of issue fixed: Medium

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The change satisfies #237. extractToolCalls marks both Task and Agent tool uses as task calls. It preserves the complete input, including description, prompt, and subagent_type, and extr…
Out of Scope Changes check	✅ Passed	The change is limited to src/main/utils/toolExtraction.ts and its focused test file. It does not alter TaskCreate, TaskUpdate, TaskOutput, or subagents/agent-{id}.jsonl handling. The added t…

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