rubber-duck

local MCP server

Installation

Terminal

claude mcp add rubber-duck -e OPENAI_API_KEY=... -e GEMINI_API_KEY=... -e GROQ_API_KEY=... -e DEFAULT_PROVIDER=... -- npx -y mcp-rubber-duck

Run in your project folder. Add --scope user to use it everywhere.

Claude Desktop, Cursor & other clients

Add to claude_desktop_config.json or .cursor/mcp.json.

{
  "mcpServers": {
    "rubber-duck": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-rubber-duck"
      ],
      "env": {
        "OPENAI_API_KEY": "...",
        "GEMINI_API_KEY": "...",
        "GROQ_API_KEY": "...",
        "DEFAULT_PROVIDER": "..."
      }
    }
  }
}

Fill in the environment variables with your own credentials.

Summary

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

Questions

rubber-duck is a local MCP server distributed as the npm package mcp-rubber-duck.

Run: claude mcp add rubber-duck -e OPENAI_API_KEY=... -e GEMINI_API_KEY=... -e GROQ_API_KEY=... -e DEFAULT_PROVIDER=... -- npx -y mcp-rubber-duck

Run: codex mcp add rubber-duck --env OPENAI_API_KEY=... --env GEMINI_API_KEY=... --env GROQ_API_KEY=... --env DEFAULT_PROVIDER=... -- npx -y mcp-rubber-duck

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