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Rubber Duck

io.github.nesquikm/rubber-duck ยท v1.18.0

Bridge to multiple LLMs and CLI agents: councils, debates, voting, and more

Source code Set it up

Connect Runs on your machine

Terminal
claude mcp add rubber-duck -e OPENAI_API_KEY=<OPENAI_API_KEY> -e GEMINI_API_KEY=<GEMINI_API_KEY> -e GROQ_API_KEY=<GROQ_API_KEY> -e DEFAULT_PROVIDER=<DEFAULT_PROVIDER> -- npx -y [email protected]
claude_desktop_config.json
{
  "mcpServers": {
    "rubber-duck": {
      "command": "npx",
      "args": [
        "-y",
        "[email protected]"
      ],
      "env": {
        "OPENAI_API_KEY": "<OPENAI_API_KEY>",
        "GEMINI_API_KEY": "<GEMINI_API_KEY>",
        "GROQ_API_KEY": "<GROQ_API_KEY>",
        "DEFAULT_PROVIDER": "<DEFAULT_PROVIDER>"
      }
    }
  }
}
~/.cursor/mcp.json
{
  "mcpServers": {
    "rubber-duck": {
      "command": "npx",
      "args": [
        "-y",
        "[email protected]"
      ],
      "env": {
        "OPENAI_API_KEY": "<OPENAI_API_KEY>",
        "GEMINI_API_KEY": "<GEMINI_API_KEY>",
        "GROQ_API_KEY": "<GROQ_API_KEY>",
        "DEFAULT_PROVIDER": "<DEFAULT_PROVIDER>"
      }
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "rubber-duck": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "[email protected]"
      ],
      "env": {
        "OPENAI_API_KEY": "<OPENAI_API_KEY>",
        "GEMINI_API_KEY": "<GEMINI_API_KEY>",
        "GROQ_API_KEY": "<GROQ_API_KEY>",
        "DEFAULT_PROVIDER": "<DEFAULT_PROVIDER>"
      }
    }
  }
}

Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.

Tools

This server runs locally, so its tools are listed by your MCP client once it starts.

Environment variables

NameDescription
OPENAI_API_KEY
Optional, secret		OpenAI API key (starts with sk-)
GEMINI_API_KEY
Optional, secret		Google Gemini API key
GROQ_API_KEY
Optional, secret		Groq API key (starts with gsk_)
DEFAULT_PROVIDER
Optional		Default LLM provider to use

Details

Package[email protected] (NPM, stdio)
First published3 Apr 2026
Last updated3 Apr 2026
Registry nameio.github.nesquikm/rubber-duck

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