Yeachan-Heo focused on backend development and API reliability in the oh-my-claudecode repository, addressing a nuanced bug in stop-hook protection logic. Using TypeScript, he refined the system so that only explicitly registered OMC skills receive session protection, while unregistered or external skills default to no protection. This targeted fix prevented unnecessary session termination and improved the reliability of external integrations. By reducing false positives in session blocking, Yeachan-Heo enhanced maintainability and user experience for external skill providers. The work demonstrated a careful approach to backend logic, emphasizing robust API development and thoughtful handling of edge cases within a complex integration environment.