Worked on the grpc/grpc repository to enhance client-side credential error messaging, focusing on clarifying the distinction between client misconfiguration and server-side authentication failures. Implemented targeted changes in C++ to update error handling logic, ensuring that messages now direct developers toward resolving configuration issues on the client rather than misattributing problems to the server. This adjustment improved the self-documentation of the SDK and streamlined the troubleshooting process for users. By refining error guidance and messaging, the work reduced potential support overhead and facilitated a smoother onboarding experience for new contributors, demonstrating a focused approach to client-server architecture and developer experience.