During September 2025, Marcus contributed to the awslabs/amazon-documentdb-tools repository by focusing on improving the user experience within the Compatibility Tool. He identified and resolved a bug where unsupported operator warnings failed to display the correct operator name and execution count, which previously led to user confusion. Using Python, Marcus applied his debugging and code refactoring skills to implement a targeted fix that enhanced the clarity and accuracy of diagnostic messages. The solution was validated through targeted tests and code review, resulting in a more transparent interface that reduces potential support requests and aligns with established project quality standards.