Rubber Duck MCP Server

What is Rubber Duck MCP Server?

Rubber Duck MCP Server is a Model Context Protocol (MCP) server that provides a rubber duck debugging tool for LLMs. It allows LLMs to explain their code to a silent “rubber duck” without expecting any response, helping organize thoughts and debug more effectively.

How to use Rubber Duck MCP Server?

Install with Python 3.10+, uv, and fastmcp, then run fastmcp install src/server.py to make the server available to Claude. For Cursor, add the generated JSON to <project root>/.cursor/mcp.json.

Key features of Rubber Duck MCP Server

• Silent rubber duck debugging companion
• Interactive squeaky duck that responds with “Squeak!”
• Two tools: rubber_duck (silent) and squeak (interactive)
• Built with FastMCP for easy MCP integration
• Works with Claude Desktop and Cursor

Use cases of Rubber Duck MCP Server

• Debugging complex code issues
• Walking through implementation logic
• Organizing thoughts during development
• Adding fun to debugging with the squeaky duck feature

FAQ from Rubber Duck MCP Server

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