Rubber Duck MCP Server

by nesquikmio.github.nesquikm/rubber-duckv1.18.0

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

178Node.jsstdioofficial registry

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Active4d ago

Install Rubber Duck MCP server

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>' -- npx -y mcp-rubber-duck

{
  "mcpServers": {
    "rubber-duck": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-rubber-duck"
      ],
      "env": {
        "OPENAI_API_KEY": "<openai-api-key>",
        "GEMINI_API_KEY": "<gemini-api-key>",
        "GROQ_API_KEY": "<groq-api-key>"
      }
    }
  }
}

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

{
  "mcpServers": {
    "rubber-duck": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-rubber-duck"
      ],
      "env": {
        "OPENAI_API_KEY": "<openai-api-key>",
        "GEMINI_API_KEY": "<gemini-api-key>",
        "GROQ_API_KEY": "<groq-api-key>"
      }
    }
  }
}

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

{
  "servers": {
    "rubber-duck": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "mcp-rubber-duck"
      ],
      "env": {
        "OPENAI_API_KEY": "<openai-api-key>",
        "GEMINI_API_KEY": "<gemini-api-key>",
        "GROQ_API_KEY": "<groq-api-key>"
      }
    }
  }
}

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

{
  "mcpServers": {
    "rubber-duck": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-rubber-duck"
      ],
      "env": {
        "OPENAI_API_KEY": "<openai-api-key>",
        "GEMINI_API_KEY": "<gemini-api-key>",
        "GROQ_API_KEY": "<groq-api-key>"
      }
    }
  }
}

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

Configuration

Variable	Required	Secret	Description
OPENAI_API_KEY	—	yes	OpenAI API key (starts with sk-)
GEMINI_API_KEY	—	yes	Google Gemini API key
GROQ_API_KEY	—	yes	Groq API key (starts with gsk_)
DEFAULT_PROVIDER	—	—	Default LLM provider to use

Freshness

Active — last maintenance signal 4d ago. The newest of the signals below sets the band.

Last commit (default branch)
2026-10-05 · 4d ago · GitHub
Latest release
2026-10-05 · 4d ago · GitHub · v1.20.9
Package published
no data · npm/PyPI
Registry entry updated
2026-04-03 · 6mo ago · official registry · v1.18.0

FAQ

›How do I install the Rubber Duck MCP server in Claude Code?

Run: 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>' -- npx -y mcp-rubber-duck. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.

›Does Rubber Duck require an API key?

Yes. It expects OPENAI_API_KEY, GEMINI_API_KEY, GROQ_API_KEY, of which 3 are secrets.

›Can I use Rubber Duck as a remote (hosted) MCP server?

No hosted endpoint is published; it runs locally over stdio.

›Is Rubber Duck in the official MCP registry?

Yes, as io.github.nesquikm/rubber-duck.