Chrome DevTools for agents

Jitterbox fork of ChromeDevTools/chrome-devtools-mcp, published as @jitterbox/chrome-devtools-mcp.

Chrome DevTools for agents (@jitterbox/chrome-devtools-mcp) lets your coding agent (such as Antigravity, Claude, Cursor or Copilot) control and inspect a live Chrome browser. It acts as a Model-Context-Protocol (MCP) server, giving your AI coding assistant access to the full power of Chrome DevTools for reliable automation, in-depth debugging, and performance analysis. A CLI is also provided for use without MCP.

Tool reference | Fork style tools | Changelog | Contributing | Troubleshooting | Design Principles

Key features

• Get performance insights: Uses Chrome DevTools to record traces and extract actionable performance insights.
• Advanced browser debugging: Analyze network requests, take screenshots and check browser console messages (with source-mapped stack traces).
• Reliable automation. Uses puppeteer to automate actions in Chrome and automatically wait for action results.
• Fork-only computed style tools: Eight Debugging tools (not in upstream) for resolved CSS, geometry, visibility, diffs, and golden snapshots. See Fork-only style tools.

Fork-only style tools

This fork adds 8 Debugging tools on top of upstream 1.9.0. They read resolved styles and geometry from DevTools CSSModel / DOMModel (same universe as get_css_styles). Snapshot first (take_snapshot), then pass uids. They are not available in --slim mode.

| Tool | What it does | | --- | --- | | get_computed_styles | Resolved computed CSS; optional cascade-accurate includeSources | | get_computed_styles_batch | Same, for many uids in one call | | get_box_model | Content / padding / border / margin quads and rects | | get_visibility | Why a node is hidden (display:none, off-viewport, …) | | diff_computed_styles | Style (and optional geometry) diff between two nodes | | save_computed_styles_snapshot | Named in-memory baseline and/or JSON golden on disk | | diff_computed_styles_snapshot | Live node vs in-memory or baselineFilePath golden | | highlight_elements_for_styles | DevTools highlight plus border quads for overlays |

Typical agent loop: take_snapshot → inspect / batch / visibility → save_computed_styles_snapshot → change the page → diff_computed_styles_snapshot. Prefer these over evaluate_script for styles. Use upstream get_css_styles when you need the cascade (why a rule won).

With --experimentalStructuredContent, each tool also sets a typed key on MCP structuredContent. --experimentalDataFormat=toon|gcf compact-encodes the same object in the text channel.

Full shapes, golden-file workflow, and structuredContent keys: Fork tool changes.

Disclaimers

chrome-devtools-mcp exposes content of the browser instance to the MCP clients allowing them to inspect, debug, and modify any data in the browser or DevTools. Avoid sharing sensitive or personal information that you don't want to share with MCP clients.

chrome-devtools-mcp officially supports Google Chrome and Chrome for Testing only. Other Chromium-based browsers may work, but this is not guaranteed, and you may encounter unexpected behavior. Use at your own discretion. We are committed to providing fixes and support for the latest version of Extended Stable Chrome.

Performance tools may send trace URLs to the Google CrUX API to fetch real-user experience data. This helps provide a holistic performance picture by presenting field data alongside lab data. This data is collected by the Chrome User Experience Report (CrUX). To disable this, run with the --no-performance-crux flag.

Usage statistics

Google collects usage statistics (such as tool invocation success rates, latency, and environment information) to improve the reliability and performance of Chrome DevTools MCP.

Data collection is enabled by default. You can opt-out by passing the --no-usage-statistics flag when starting the server:

"args": ["-y", "@jitterbox/chrome-devtools-mcp@latest", "--no-usage-statistics"]

Google handles this data in accordance with the Google Privacy Policy.

Google's collection of usage statistics for Chrome DevTools MCP is independent from the Chrome browser's usage statistics. Opting out of Chrome metrics does not automatically opt you out of this tool, and vice-versa.

Collection is disabled if CHROME_DEVTOOLS_MCP_NO_USAGE_STATISTICS or CI env variables are set.

Update checks

By default, the server periodically checks the npm registry for updates and logs a notification when a newer version is available. You can disable these update checks by setting the CHROME_DEVTOOLS_MCP_NO_UPDATE_CHECKS environment variable.

Requirements

• Node.js LTS version.
• Chrome current stable version or newer.
• npm

Getting started

Add the following config to your MCP client:

{
  "mcpServers": {
    "chrome-devtools": {
      "command": "npx",
      "args": ["-y", "@jitterbox/chrome-devtools-mcp@latest"]
    }
  }
}

[!NOTE] Using @jitterbox/chrome-devtools-mcp@latest ensures that your MCP client will always use the latest version of this fork.

If you are interested in doing only basic browser tasks, use the --slim mode:

{
  "mcpServers": {
    "chrome-devtools": {
      "command": "npx",
      "args": ["-y", "@jitterbox/chrome-devtools-mcp@latest", "--slim", "--headless"]
    }
  }
}

See Slim tool reference.

MCP Client configuration

For setup instructions specific to your editor or agent (e.g. Antigravity, Claude Code, Cursor, VS Code), please see our Client Configurations Guide.

Your first prompt

Enter the following prompt in your MCP Client to check if everything is working:

Check the performance of https://developers.chrome.com

Your MCP client should open the browser and record a performance trace.

[!NOTE] The MCP server will start the browser automatically once the MCP client uses a tool that requires a running browser instance. Connecting to the Chrome DevTools MCP server on its own will not automatically start the browser.

Tools

If you run into any issues, checkout our troubleshooting guide. See the full Tool Reference for every MCP capability, including the fork-only style tools.

Configuration

Find the complete list of server parameters (e.g., --headless, --isolated, --slim) and how to configure WebSocket connections in the Configuration Guide.

Advanced Usage

For advanced features such as handling concurrent sessions, persistent user data directories, connecting to a running Chrome instance instead of starting a new one, or debugging on Android, see our Advanced Usage Guide.

Integrating as a browser subagent

If you are developing agentic tooling and want to provide an integrated browser subagent as part of your product, we recommend building on top of Chrome DevTools for agents.

For a reference implementation, see the Gemini CLI browser agent documentation.