Browser Compat MCP Server

by cyanheadsio.github.cyanheads/browser-compat-mcp-serverv0.2.0

Browser compatibility and Baseline status for any web feature — offline, from bundled MDN data.

1Node.jsstdioremoteofficial registry

context tax

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security

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cold start

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freshness

Active9d ago

Install Browser Compat MCP server

claude mcp add browser-compat -- npx -y @cyanheads/browser-compat-mcp-server run start:stdio

{
  "mcpServers": {
    "browser-compat": {
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/browser-compat-mcp-server",
        "run",
        "start:stdio"
      ]
    }
  }
}

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (project).

{
  "mcpServers": {
    "browser-compat": {
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/browser-compat-mcp-server",
        "run",
        "start:stdio"
      ]
    }
  }
}

Settings → Developer → Edit Config (claude_desktop_config.json), then restart.

{
  "servers": {
    "browser-compat": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/browser-compat-mcp-server",
        "run",
        "start:stdio"
      ]
    }
  }
}

Add to .vscode/mcp.json in your workspace.

{
  "mcpServers": {
    "browser-compat": {
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/browser-compat-mcp-server",
        "run",
        "start:stdio"
      ]
    }
  }
}

Add to ~/.codeium/windsurf/mcp_config.json.

Configuration

Variable	Required	Secret	Description
MCP_LOG_LEVEL	—	—	Sets the minimum log level for output (e.g., 'debug', 'info', 'warn').
MCP_HTTP_HOST	—	—	The hostname for the HTTP server.
MCP_HTTP_PORT	—	—	The port to run the HTTP server on.
MCP_HTTP_ENDPOINT_PATH	—	—	The endpoint path for the MCP server.
MCP_AUTH_MODE	—	—	Authentication mode to use: 'none', 'jwt', or 'oauth'.

Remote endpoints

streamable-httphttps://browser-compat.caseyjhand.com/mcp

Freshness

Active — last maintenance signal 9d ago. The newest of the signals below sets the band.

Last commit (default branch)
2026-09-30 · 9d ago · GitHub
Latest release
2026-09-30 · 9d ago · GitHub · v0.2.0
Package published
no data · npm/PyPI
Registry entry updated
2026-09-30 · 9d ago · official registry · v0.2.0

FAQ

›How do I install the Browser Compat MCP server in Claude Code?

Run: claude mcp add browser-compat -- npx -y @cyanheads/browser-compat-mcp-server run start:stdio. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.

›Does Browser Compat require an API key?

No required environment variables are declared in its published metadata.

›Can I use Browser Compat as a remote (hosted) MCP server?

Yes — it offers both a hosted endpoint and a local stdio package.

›Is Browser Compat in the official MCP registry?

Yes, as io.github.cyanheads/browser-compat-mcp-server.