Rubber Duck MCP Server

What the code does

We read the source, 1 h ago · rules 3dff92dd89df

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

    const child = spawn(command, args, {

    return Object.keys(process.env).some((key) => key.startsWith('MCP_SERVER_'));

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

Connect this server

This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.

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

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

[mcp_servers.rubber-duck]
command = "npx"
args = ["-y", "mcp-rubber-duck"]

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

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

This one needs environment variables set before it will start: OPENAI_API_KEY (OpenAI API key (starts with sk-)), GEMINI_API_KEY (Google Gemini API key), GROQ_API_KEY (Groq API key (starts with gsk_)), DEFAULT_PROVIDER (Default LLM provider to use). The author declared them in the registry entry; get the values from the project itself.