Yes, Rubber Duck is free to use.

How do I install Rubber Duck?

Rubber Duck is a local plugin. Install it using npm package: mcp-rubber-duck and add the generated configuration snippet to your AI app's MCP config file. Then restart your AI app.

What credentials does Rubber Duck need?

Rubber Duck requires the following credentials or environment variables: OPENAI_API_KEY, GEMINI_API_KEY, GROQ_API_KEY, DEFAULT_PROVIDER. You can find setup instructions on the server detail page.

What AI apps work with Rubber Duck?

Rubber Duck uses the Model Context Protocol (MCP) and works with any MCP-compatible AI app, including Claude, ChatGPT / Codex, Gemini, Copilot, Cursor, and more.

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Rubber Duck MCP Server

by nesquikm

Developer ToolsLow Risk9.5Local

Free

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

About

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

What You'll Need

Set these up before or after installing:

OpenAI API key (starts with sk-)Required

Environment variable: OPENAI_API_KEY

Google Gemini API keyRequired

Environment variable: GEMINI_API_KEY

Groq API key (starts with gsk_)Required

Environment variable: GROQ_API_KEY

Default LLM provider to useOptional

Environment variable: DEFAULT_PROVIDER

How to Install

Add this to your MCP configuration file:

{
  "mcpServers": {
    "io-github-nesquikm-rubber-duck": {
      "env": {
        "GROQ_API_KEY": "your-groq-api-key-here",
        "GEMINI_API_KEY": "your-gemini-api-key-here",
        "OPENAI_API_KEY": "your-openai-api-key-here",
        "DEFAULT_PROVIDER": "your-default-provider-here"
      },
      "args": [
        "-y",
        "mcp-rubber-duck"
      ],
      "command": "npx"
    }
  }
}

Security Report

9.5

Low Risk9.5Low Risk

Valid MCP server (3 strong, 1 medium validity signals). 1 known CVE in dependencies Package registry verified. Imported from the Official MCP Registry.

6 files analyzed · 2 issues found

Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.