Browser Agent vs Extensiondev MCP

In-depth architectural comparison of the Browser Agent and Extensiondev MCP MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

Which MCP Server Should You Choose?

B

Choose Browser Agent when:

• You need dedicated capabilities in the Developer Tools domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).
• Primary tools included: browser-agent.

Explore Browser Agent Details

Choose Extensiondev MCP when:

• You need dedicated capabilities in the Developer Tools domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).

Explore Extensiondev MCP Details

Feature & Specification Comparison

Specification	B Browser Agent Developer Tools	Extensiondev MCP extensiondev Developer Tools
Summary	MCP server for browser automation with AI agent	Build, run, inspect, and publish browser extensions from any MCP client. 28 tools, 11 browsers.
Category & Scope	Developer Tools	Developer Tools

Tools & Capabilities Breakdown

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

{
  "mcpServers": {
    "browser-agent": {
      "command": "npx",
      "args": [
        "-y",
        "runbook-ai-mcp@latest"
      ]
    }
  }
}

{
  "mcpServers": {
    "mcp-291": {
      "command": "npx",
      "args": [
        "-y",
        "@extension.dev/mcp"
      ]
    }
  }
}

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