ACP integration documents

[g-samroberts]

Summary

ACP integration documents: Update existing IDE integration documents, and give details about ACP mode in Gemini CLI.

Fixes: google-gemini/maintainers-gemini-cli#1427

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-cli]

Hi @g-samroberts, 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 enhances the Gemini CLI documentation by introducing a dedicated guide for the Agent Communication Protocol (ACP) mode and integrating this information into the broader IDE integration documentation. The changes aim to provide clearer instructions and a deeper understanding of how Gemini CLI interacts with various development environments, particularly for programmatic control and advanced integrations.

Highlights

• New ACP Mode Documentation: A new comprehensive document has been added detailing the Agent Communication Protocol (ACP) mode for Gemini CLI, explaining its architecture, usage, and extensibility via Model Context Protocol (MCP).
• Updated IDE Integration Guide: The existing IDE integration documentation has been significantly updated to clearly differentiate between the VS Code Companion Extension and ACP-based integrations, providing more details on how ACP facilitates integration with IDEs like JetBrains and Zed.
• Sidebar Navigation Update: The documentation sidebar has been updated to include a direct link to the newly added ACP mode documentation, improving discoverability.

Changelog

• docs/cli/acp-mode.md
  • Added a new document explaining the Agent Communication Protocol (ACP) mode, its architecture, communication methods (JSON-RPC over stdio), and extensibility through the Model Context Protocol (MCP).
  • Detailed core methods, session control, and file system proxy features within ACP.
  • Included sections on debugging and telemetry for ACP mode.
• docs/ide-integration/index.md
  • Updated the introduction to outline two primary integration methods: VS Code Companion Extension and Agent Communication Protocol (ACP).
  • Restructured the document to separate details for the VS Code Companion Extension and introduce a new section for ACP integration.
  • Added information about the ACP Agent Registry and specific IDE integrations for JetBrains and Zed.
  • Revised subheadings for consistency (e.g., 'Features' to '### Features', 'Installation and setup' to '### Installation and Setup').
  • Added a new troubleshooting section specifically for ACP integration errors, directing users to the new ACP mode document.
• docs/sidebar.json
  • Added a new entry for 'ACP mode' under the CLI documentation section, linking to the new docs/cli/acp-mode.md file.

Activity

• The pull request addresses issue google-gemini/maintainers-gemini-cli#1427.
• The author has marked the relevant documentation and README as updated in the pre-merge checklist.

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[gemini-code-assist]

Code Review

This pull request adds new documentation for the ACP (Agent Communication Protocol) mode and updates the existing IDE integration documentation to include details about ACP. The changes are well-structured and improve the documentation by providing a clear overview of different integration methods. I've found two broken/incorrect links in the updated ide-integration/index.md file that should be fixed to ensure users can access the correct information.

_{Note: Security Review has been skipped due to the limited scope of the PR.}

[github-actions]

Size Change: -4 B (0%)

Total Size: 26.3 MB

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[nmcnamara-eng]

I added a bunch of comments / suggested edits. What do you think?

[jkcinouye]

LGTM.