feat(core): introduce Kind.Agent for sub-agent classification

[abhipatel12]

Summary

This PR introduces a new tool category, Kind.Agent, to distinguish sub-agents from generic "Thinking" tools. This is the foundational step for enabling parallel execution of sub-agents by signaling to the Scheduler that they are independent agent loops.

Details

• Added Kind.Agent = 'agent' to the Kind enum in packages/core/src/tools/tools.ts.
• Updated SubagentTool and SubagentToolWrapper to use Kind.Agent.
• Updated Zed integration in packages/cli/src/zed-integration/zedIntegration.ts to map Kind.Agent to 'think', maintaining compatibility with the ACP protocol while resolving type/ESLint issues.
• Added test coverage for the new classification in SubagentTool.

Related Issues

Part of the Parallel Sub-Agent Execution initiative.

How to Validate

1. Run unit tests for core package: npm test -w @google/gemini-cli-core -- src/agents/subagent-tool.test.ts
2. Run unit tests for subagent-tool-wrapper: npm test -w @google/gemini-cli-core -- src/agents/subagent-tool-wrapper.test.ts
3. Verify type safety: npm run typecheck -w @google/gemini-cli
4. Verify Zed integration mapping: Run npm run lint -w @google/gemini-cli and ensure no unsafe type assertion errors in zedIntegration.ts.

Pre-Merge Checklist

• Updated relevant documentation and README (if needed)
• Added/updated tests (if needed)
• Noted breaking changes (if any)
• Validated on required platforms/methods:
  • MacOS
    • npm run
    • npx
    • Docker
    • Podman
    • Seatbelt
  • Windows
    • npm run
    • npx
    • Docker
  • Linux
    • npm run
    • npx
    • Docker

[gemini-code-assist]

Summary of Changes

Hello @abhipatel12, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request establishes a new classification for sub-agents within the system by introducing a dedicated Kind.Agent enum. This change is a foundational step towards enabling parallel execution of sub-agents by providing a clear signal to the Scheduler that these are independent agent loops, improving system architecture and future scalability.

Highlights

• New Tool Classification: Introduced a new Kind.Agent enum value to distinctly classify sub-agents within the system.
• Sub-Agent Tool Updates: Updated SubagentTool and SubagentToolWrapper to utilize the new Kind.Agent for proper classification, replacing the previous Kind.Think.
• Zed Integration Compatibility: Modified Zed integration to map the new Kind.Agent to the existing 'think' ACP protocol kind, ensuring backward compatibility.
• Test Coverage: Added a new unit test to confirm that SubagentTool correctly uses the Kind.Agent classification.

Changelog

• packages/cli/src/zed-integration/zedIntegration.ts
  • Mapped the new Kind.Agent to the acp.ToolKind.Think for Zed integration.
• packages/core/src/agents/subagent-tool-wrapper.test.ts
  • Updated the test assertion for SubagentToolWrapper to expect Kind.Agent.
• packages/core/src/agents/subagent-tool-wrapper.ts
  • Modified the SubagentToolWrapper constructor to use Kind.Agent instead of Kind.Think.
• packages/core/src/agents/subagent-tool.test.ts
  • Added an import for Kind.
  • Added a new test case to verify that SubagentTool's kind property is set to Kind.Agent.
• packages/core/src/agents/subagent-tool.ts
  • Updated the SubagentTool constructor to assign Kind.Agent as its type.
• packages/core/src/tools/tools.ts
  • Extended the Kind enum with a new member, Agent = 'agent'.

Activity

• No specific review comments or approvals have been recorded yet.

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[gemini-code-assist]

Code Review

This pull request introduces Kind.Agent as a new tool category to classify sub-agents, replacing the more generic Kind.Think. The changes are applied to SubagentTool and SubagentToolWrapper. For compatibility with the ACP protocol, Kind.Agent is mapped to 'think' in the Zed integration. Tests have been updated to reflect these changes. The modifications are consistent with the goal of distinguishing sub-agent tools, which is a prerequisite for future work on parallel execution.

[github-actions]

Size Change: +82 B (0%)

Total Size: 25.7 MB

ℹ️ View Unchanged

Filename	Size	Change
./bundle/gemini.js	25.2 MB	+82 B (0%)
./bundle/node_modules/@google/gemini-cli-devtools/dist/client/main.js	221 kB	0 B
./bundle/node_modules/@google/gemini-cli-devtools/dist/src/_client-assets.js	227 kB	0 B
./bundle/node_modules/@google/gemini-cli-devtools/dist/src/index.js	11.5 kB	0 B
./bundle/node_modules/@google/gemini-cli-devtools/dist/src/types.js	132 B	0 B
./bundle/sandbox-macos-permissive-open.sb	890 B	0 B
./bundle/sandbox-macos-permissive-proxied.sb	1.31 kB	0 B
./bundle/sandbox-macos-restrictive-open.sb	3.36 kB	0 B
./bundle/sandbox-macos-restrictive-proxied.sb	3.56 kB	0 B
./bundle/sandbox-macos-strict-open.sb	4.82 kB	0 B
./bundle/sandbox-macos-strict-proxied.sb	5.02 kB	0 B

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