Litmus MCP Server: Install & Setup

Install Litmus in Claude Code

Remote URL

Claude Code

claude mcp add --transport http litmus https://polygraph.so/api/mcp

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

{
  "mcpServers": {
    "litmus": {
      "url": "https://polygraph.so/api/mcp"
    }
  }
}

npm

Claude Code

claude mcp add litmus -- npx -y @polygraphso/litmus

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

{
  "mcpServers": {
    "litmus": {
      "command": "npx",
      "args": [
        "-y",
        "@polygraphso/litmus"
      ]
    }
  }
}

Frequently asked questions

What does the Litmus MCP server do?

Grade MCP servers A to F with the open behavioral litmus. npm: full toolset; hosted: lookups only.

Is the Litmus 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 Litmus run locally or remotely?

Local + Remote. Can run locally or be used as a hosted remote server.

How do I add Litmus to Claude Code?

Run: claude mcp add --transport http litmus https://polygraph.so/api/mcp

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