Marc contributed to the xlang-ai/OSWorld repository by addressing a reliability issue in the evaluation workflow, focusing on evidence URL validation. He enhanced the backend logic to accept both direct search URLs and Google redirect URLs, mitigating failures caused by CAPTCHA and redirects. Using skills in API integration and backend development, Marc updated the URL matching patterns in JSON-based workflows to ensure automated evaluations could proceed without manual intervention. This targeted bug fix improved operational efficiency and reduced troubleshooting overhead. The work demonstrated a thoughtful approach to edge cases in automated systems, reflecting a solid understanding of backend reliability and workflow automation.