Arc DevTools MCP Server

This is a modified version of the Chrome DevTools MCP Server optimized for the Arc Browser.

Why this fork?

The original Chrome DevTools MCP server uses Target.createTarget (equivalent to browser.newPage()) to open new tabs. This method causes the Arc Browser to crash immediately due to conflicts with its unique tab/space management system.

This fork modifies the new_page tool to:

1. Reuse an existing blank page (about:blank) if available.
2. Reuse the last active page if no blank page is found.
3. Only fall back to newPage() as a last resort (though this may still crash Arc).

This allows AI assistants like Claude, Cursor, and Gemini to control Arc without causing stability issues.

Usage

Prerequisites

1. Arc Browser installed on macOS.
2. Node.js (v18 or higher) and pnpm installed.

Installation

1. Clone this repository:

   git clone https://github.com/fukayatti/arc-devtools-mcp.git
   cd arc-devtools-mcp

2. Install dependencies:

   pnpm install

3. Build the project:

   npm run build

Configuration (Claude / Cursor / Gemini)

Add the following to your MCP configuration file (e.g., ~/Library/Application Support/Cursor/User/globalStorage/mcp-config.json or equivalent):

{
  "mcpServers": {
    "arc-devtools": {
      "command": "npx",
      "args": ["-y", "@fukayatti0/arc-devtools-mcp"]
    }
  }
}

Or run via docker:

npx -y @fukayatti0/arc-devtools-mcp

Manual Configuration (Local Build)

If you built it locally:

Running Arc with Remote Debugging

You must start Arc with the remote debugging port enabled for this to work. Run this command in your terminal:

/Applications/Arc.app/Contents/MacOS/Arc --remote-debugging-port=9222

(Note: Arc must be fully quit before running this command.)

Verification

Once connected, you can use MCP tools like list_pages, navigate_page, take_screenshot, etc., safely within Arc.

License

Apache-2.0 (Same as the original project)