Andrew developed a complete OAuth 2.1 authentication integration for the jlowin/fastmcp repository, focusing on secure API access and improved developer onboarding. He implemented PropelAuth as an authentication provider, enabling token introspection and resource validation within FastAPI-based backend services. The work included creating an end-to-end example server and client to demonstrate authenticated requests and user information retrieval, as well as updating the project’s documentation to reflect the new integration and usage instructions. Using Python and Markdown, Andrew delivered a well-scoped feature that enhances standards-based authentication for FastMCP-powered services, providing a solid foundation for secure backend development workflows.