Worked on hardening Docker distribution authentication error handling across the containers/container-libs and containers/image repositories. Focused on removing dependencies on external challenge packages by implementing direct parsing of WWW-Authenticate headers within the handleErrorResponse logic. Enhanced error reporting and aligned the error handling approach with distribution v3 changes to support more stable releases and smoother deployments. Developed comprehensive unit and integration tests to validate multiple authentication scenarios, improving reliability and visibility into authentication failures. Utilized Go for development, emphasizing robust API integration, HTTP header parsing, and thorough testing practices to reduce external coupling and strengthen image distribution flows across both repositories.