Rubber Duck MCP Server: Install & Setup

Install Rubber Duck in Claude Code

Claude Code

claude mcp add rubber-duck -- npx -y mcp-rubber-duck

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

{
  "mcpServers": {
    "rubber-duck": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-rubber-duck"
      ]
    }
  }
}

Frequently asked questions

What does the Rubber Duck MCP server do?

Bridge to multiple OpenAI-compatible LLMs for rubber duck debugging: explain a problem to several AI ducks and get different perspectives.

Is the Rubber Duck MCP server free?

The server is free, but you will likely need an account. The server itself is free, but it connects to a service that needs an account or API key, which may have paid tiers. Check the provider for current pricing.

Does Rubber Duck run locally or remotely?

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

How do I add Rubber Duck to Claude Code?

Run: claude mcp add rubber-duck -- npx -y mcp-rubber-duck

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