Worked on the canonical/snapcraft repository to address a targeted bug in the TryCommand feature, focusing on backend development and robust error handling using Python. Enhanced the error messaging system so that when users encounter unimplemented features, the error now reports the effective base, offering clearer guidance and actionable feedback. Updated unit tests to reflect the new error format, which improved regression coverage and maintainability. This approach not only clarified user-facing errors but also streamlined troubleshooting and reduced support overhead. The work demonstrated attention to detail in error handling and testing, contributing to a more maintainable and user-friendly codebase.