fix(core): increase A2A agent timeout to 30 minutes

[adamfweidman]

Summary

Increases the timeout for A2A (Agent-to-Agent) client requests to 30 minutes. This ensures that long-running remote agents, like Deep Research, can complete their tasks without being cut off by the default 5-minute timeout.

Details

• Added a dedicated UndiciAgent (dispatcher) with headersTimeout and bodyTimeout set to 30 minutes (1,800,000ms).
• Replaced the global fetch calls in A2AClientManager with a custom a2aFetch that uses this dispatcher.
• This change prevents remote agents from timing out on long operations while leaving the global fetch timeout unaffected for other operations.

Related Issues

Fixes #21027

How to Validate

1. Run a long-running A2A agent (e.g., Deep Research).
2. Verify that the request does not time out after 5 minutes and continues until completion (up to 30 minutes).

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

[gemini-cli]

Hi @adamfweidman, thank you so much for your contribution to Gemini CLI! We really appreciate the time and effort you've put into this.

We're making some updates to our contribution process to improve how we track and review changes. Please take a moment to review our recent discussion post: Improving Our Contribution Process & Introducing New Guidelines.

Key Update: Starting January 26, 2026, the Gemini CLI project will require all pull requests to be associated with an existing issue. Any pull requests not linked to an issue by that date will be automatically closed.

Thank you for your understanding and for being a part of our community!

[gemini-code-assist]

Summary of Changes

Hello, 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 addresses an issue where long-running remote agents were timing out due to a default 5-minute fetch limit. By implementing a dedicated dispatcher with an extended 30-minute timeout specifically for Agent-to-Agent communications, it ensures these agents can complete their tasks without interruption, while preserving the existing timeout behavior for all other fetch operations.

Highlights

• Increased A2A Agent Timeout: The timeout for Agent-to-Agent (A2A) client requests has been extended to 30 minutes (1,800,000ms) to accommodate long-running remote agents like Deep Research.
• Dedicated UndiciAgent Dispatcher: A new UndiciAgent dispatcher (a2aDispatcher) was introduced with headersTimeout and bodyTimeout specifically set to 30 minutes for A2A requests.
• Isolated Timeout Change: The global fetch timeout remains unaffected, as A2A client requests now use a custom a2aFetch function that leverages the dedicated a2aDispatcher.

Changelog

• packages/core/src/agents/a2a-client-manager.ts
  • Imported Agent from undici.
  • Defined A2A_TIMEOUT constant set to 30 minutes (1,800,000ms).
  • Created a2aDispatcher using UndiciAgent with extended headersTimeout and bodyTimeout.
  • Implemented a2aFetch to use the a2aDispatcher for A2A requests.
  • Modified A2AClientManager to use a2aFetch instead of the global fetch for agent resolution, including when createAuthenticatingFetchWithRetry is applied.

Activity

• No specific activity (comments, reviews, or progress updates) has been recorded for this pull request since its creation.

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[gemini-code-assist]

Code Review

This pull request increases the timeout for A2A client requests to 30 minutes to support long-running agents. The implementation correctly creates a custom undici dispatcher with the longer timeout and uses it for A2A fetch calls without affecting the global fetch timeout. My review includes one suggestion to improve type safety and code clarity around the custom fetch implementation by using // @ts-expect-error instead of a misleading type assertion.

[github-actions]

Size Change: +471 B (0%)

Total Size: 25.9 MB

ℹ️ View Unchanged

Filename	Size	Change
./bundle/gemini.js	25.4 MB	+471 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

_{compressed-size-action}

[jacob314]

can you add a test that verifies that the timeout passed in is actually respected? particularly given we ware passing it in getting around the type system.