Worked on the cositools/cosipy repository to enhance the user experience for machine learning features by addressing error handling around optional dependencies. Focused on Python development, the work involved implementing user-facing error messages that clearly inform users when required machine learning packages are missing. The solution provided actionable installation instructions, including example commands, to streamline onboarding and reduce support requests. Emphasizing package management and robust error handling, this update improved the reliability of optional ML features without introducing new features. The approach lowered barriers for new users and contributed to a smoother setup process for those leveraging machine learning capabilities.