Worked on the traPtitech/traQ repository to enhance API reliability by implementing strict validation for stamp UUID arrays. Focused on enforcing uniqueness and a maximum of 200 items per array, this feature addressed potential data inconsistencies and abuse scenarios. The approach involved updating API documentation using YAML to clearly communicate these constraints, ensuring that documentation accurately reflected the system’s behavior. By aligning the API’s input validation with its documentation, the work improved data integrity and reduced edge-case errors. Demonstrated disciplined version control practices by delivering a focused commit that resolved a critical data-validation concern without introducing unnecessary complexity or changes.