MCP Auth Demos: Node.js, Python & Ruby Servers

This repository demonstrates secure, production-ready Model Context Protocol (MCP) servers in Node.js, Python, and Ruby on Rails, with full integration to the Scalekit platform for OAuth 2.1 authentication and dynamic client registration.

Repository Structure

• greeting-mcp-node/
  Node.js (TypeScript) implementation of an MCP server with Scalekit authentication and permissioned tool access.
• greeting-mcp-python/
  Python (FastAPI + FastMCP) implementation of an MCP server with Scalekit authentication and permissioned tool access.
• greeting-mcp-ruby/
  Ruby on Rails implementation of an MCP server with Scalekit OAuth 2.1 authentication. Uses the official MCP Ruby SDK with JWKS-based token validation — no client secret required.

Each subdirectory contains its own README with detailed setup and usage instructions.

Features

• Scalekit OAuth 2.1 Authentication: Secure, standards-based authentication and authorization for all MCP requests.
• Dynamic Client Registration: Register MCP servers with Scalekit for secure, permissioned access.
• JWKS Token Validation: RS256 signature verification via auto-discovered JWKS — no client secrets stored.
• Tool-Based Architecture: Easily extend with new tools and permissions.
• Production-Ready: Includes logging, CORS, and environment-based configuration.

Quick Start

See the README in each subproject for setup instructions:

• Node.js MCP Server
• Python MCP Server
• Ruby on Rails MCP Server

License

This repository is licensed under the MIT License. See LICENSE for details.

Learn More

• Scalekit Documentation
• Model Context Protocol (MCP)