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mcp-pyodide

by yonaka15
GitHub
TypeScript
MIT License
3
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Integrations

  • Used as the web framework for SSE (Server-Sent Events) support, providing endpoints for SSE connection and message handling

  • The server runs on Node.js, requiring version 18 or higher for development

  • Used for package management and running scripts for the MCP server

mcp-pyodide

A Pyodide server implementation for the Model Context Protocol (MCP). This server enables Large Language Models (LLMs) to execute Python code through the MCP interface.

Features

  • Python code execution capability for LLMs using Pyodide
  • MCP compliant server implementation
  • Support for both stdio and SSE transport modes
  • Robust implementation written in TypeScript
  • Available as a command-line tool

Installation

npm install mcp-pyodide

Usage

As a Server

import { runServer } from "mcp-pyodide"; // Start the server runServer().catch((error: unknown) => { console.error("Error starting server:", error); process.exit(1); });

As a Command-line Tool

Start in stdio mode (default):

mcp-pyodide

Start in SSE mode:

mcp-pyodide --sse

SSE Mode

When running in SSE mode, the server provides the following endpoints:

  • SSE Connection: http://localhost:3020/sse
  • Message Handler: http://localhost:3020/messages

Example client connection:

const eventSource = new EventSource("http://localhost:3020/sse"); eventSource.onmessage = (event) => { console.log("Received:", JSON.parse(event.data)); };

Project Structure

mcp-pyodide/ ├── src/ │ ├── formatters/ # Data formatting handlers │ ├── handlers/ # Request handlers │ ├── lib/ # Library code │ ├── tools/ # Utility tools │ ├── utils/ # Utility functions │ └── index.ts # Main entry point ├── build/ # Build artifacts ├── pyodide-packages/ # Pyodide-related packages └── package.json

Dependencies

  • @modelcontextprotocol/sdk: MCP SDK (^1.4.0)
  • pyodide: Python runtime environment (^0.27.1)
  • arktype: Type validation library (^2.0.1)
  • express: Web framework for SSE support
  • cors: CORS middleware for SSE support

Development

Requirements

  • Node.js 18 or higher
  • npm 9 or higher

Setup

# Clone the repository git clone <repository-url> # Install dependencies npm install # Build npm run build

Scripts

  • npm run build: Compile TypeScript and set execution permissions
  • npm start: Run server in stdio mode
  • npm run start:sse: Run server in SSE mode

Environment Variables

  • PYODIDE_CACHE_DIR: Directory for Pyodide cache (default: "./cache")
  • PYODIDE_DATA_DIR: Directory for mounted data (default: "./data")
  • PORT: Port for SSE server (default: 3020)

License

MIT

Contributing

  1. Fork the repository
  2. Create a feature branch (git checkout -b feature/amazing-feature)
  3. Commit your changes (git commit -am 'Add some amazing feature')
  4. Push to the branch (git push origin feature/amazing-feature)
  5. Create a Pull Request

Important Notes

  • This project is under development, and the API may change
  • Thoroughly test before using in production
  • Exercise caution when executing untrusted code for security reasons
  • When using SSE mode, ensure proper CORS configuration if needed

Support

Please use the Issue tracker for problems and questions.

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A
security – no known vulnerabilities
A
license - permissive license
A
quality - confirmed to work

local-only server

The server can only run on the client's local machine because it depends on local resources.

Tools

A Pyodide server for executing Python code by Large Language Models (LLMs) via the Model Context Protocol (MCP).

  1. Features
    1. Installation
      1. Usage
        1. As a Server
        2. As a Command-line Tool
        3. SSE Mode
      2. Project Structure
        1. Dependencies
          1. Development
            1. Requirements
            2. Setup
            3. Scripts
          2. Environment Variables
            1. License
              1. Contributing
                1. Important Notes
                  1. Support

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