Worked on enhancing authentication mechanisms for the BerriAI/litellm repository by upgrading the MCP server creation process. Replaced user API key-based authentication with a system that leverages Authorization headers or session cookies, enabling browser-based OAuth flows and reducing credential exposure. Focused on backend development using Python, with an emphasis on secure API development practices. Expanded and updated test coverage to ensure the new authentication flow was robust and regression-free, collaborating closely with testing teams. The changes improved security, aligned with modern OAuth standards, and enhanced maintainability for MCP server workflows, reflecting a thoughtful and security-oriented engineering approach throughout the project.