Claude Chrome MCP

Browser automation tool enabling MCP clients (Claude Desktop, Claude Code, Cursor) to interact with claude.ai through Chrome extension and MCP server.

Components

• MCP Server
• Chrome Extension (enabled only for claude.ai)
• CLI Tool

Quick Start

Prerequisites

• Google Chrome browser
• Node.js v16 or higher
• npm installed

Step 1: Install Chrome Extension

1. Open Chrome and navigate to chrome://extensions/
2. Enable "Developer mode" (toggle in top right)
3. Click "Load unpacked" and select the extension/ directory from this project
4. The extension icon should appear in your toolbar

Step 2: Install Dependencies

# From the project root directory
cd mcp-server
npm install

Step 3: Configure Claude Desktop

1. Open Claude Desktop settings
2. Navigate to Developer > Edit Config
3. Add this configuration:

{
  "mcpServers": {
    "claude-chrome-mcp": {
      "command": "node",
      "args": ["<absolute-path-to-project>/mcp-server/src/server.js"]
    }
  }
}

Replace <absolute-path-to-project> with the full path to this project (e.g., /Users/yourname/claude-chrome-mcp)

Step 4: Restart Claude Desktop

After adding the configuration, restart Claude Desktop to load the MCP server. The server will automatically start its embedded WebSocket relay on port 54321.

Step 5: Test the Connection

In Claude Desktop, you can now use natural language commands like:

• "Check Chrome status"
• "Open a new tab"
• "Send 'Hello, World!' to the new Claude tab"
• "List all open Claude tabs"
• "Search for Claude chats with 'math'"

Key Features

• Async message sending with completion detection
• Claude-to-Claude response forwarding
• Conversation management via Claude.ai API
• Network inspection and debugging tools
• WebSocket-only architecture with persistent connections
• Health monitoring endpoint for relay status

Documentation

Guide	Description
Architecture Analysis	Critical issues and improvement roadmap
Architecture	System design and components
Troubleshooting	Complete troubleshooting and timeout resolution
Development Workflows	Code changes, testing, and development procedures
TypeScript	Type definitions and development
CLI Tools	Command-line interface and setup
Event Architecture	Visual system diagrams

Project Resources

• MCP Configuration - Quick commands and setup
• GitHub Releases - Release history
• GitHub Issue Script - Claude Code integration utilities

CLI Tool (Optional)

npm install && npm run build && npm link

Architecture

┌─────────────────┐    ┌──────────────────┐    ┌─────────────────┐
│   Claude.ai     │    │ Chrome Extension │    │ WebSocket Relay │
│   (Browser)     │◄──►┤ (Offscreen Doc)  │◄──►│   Port 54321    │
└─────────────────┘    └──────────────────┘    └─────────────────┘
                                                         ▲
                                                         │
                                                ┌────────┴────────┐
                                                │                 │
                                        ┌───────▼──────┐ ┌───────▼──────┐
                                        │ MCP Server   │ │ Claude Code  │
                                        │ (Relay Mode) │ │ MCP Client   │
                                        └──────────────┘ └──────────────┘