LocalFree

Extensiondev MCP server

extensiondev/mcp

Build, run, inspect, and publish browser extensions from any MCP client. 35 tools, 13 browsers.

0 GitHub stars
Source code Website

Install Extensiondev in Claude Code

Claude Code
claude mcp add extensiondev -- npx -y @extension.dev/mcp
mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)
{
  "mcpServers": {
    "extensiondev": {
      "command": "npx",
      "args": [
        "-y",
        "@extension.dev/mcp"
      ]
    }
  }
}

Frequently asked questions

What does the Extensiondev MCP server do?

Build, run, inspect, and publish browser extensions from any MCP client. 35 tools, 13 browsers.

Is the Extensiondev MCP server free?

Yes, most likely. Open source and no paid account or API key is mentioned in the listing. Check the provider for current pricing.

Does Extensiondev run locally or remotely?

Local. Runs on your machine (stdio). You install it with npx, uvx, Docker or from source.

How do I add Extensiondev to Claude Code?

Run: claude mcp add extensiondev -- npx -y @extension.dev/mcp

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