Worked on stabilizing client authentication in the fastmcp repository by addressing a bug related to OAuth scope handling. Delivered a targeted fix that normalizes Azure OAuth scopes, translating them from a prefixed format into a client-friendly version to prevent permission errors during authentication with MCP clients. This backend improvement, implemented in Python, enhanced the reliability of API integrations and reduced onboarding friction for new clients. The solution was developed with a focus on unit testing and precise commit documentation, ensuring maintainability and clear attribution. The work demonstrates attention to detail in backend development and a methodical approach to authentication challenges.