Worked on enhancing the OpenTripPlanner repository by delivering a targeted update to the GraphQL API documentation, specifically clarifying the behavior of the stoptimesForDate field. Focused on improving the schema documentation to address how the API responds when trips do not operate on a specified date and to clearly indicate deprecation status. Utilized skills in API documentation and GraphQL schema design to reduce ambiguity for API consumers and streamline onboarding for external developers. The work maintained codebase quality by providing explicit guidance on edge cases, ensuring that developers interacting with the GraphQL API have a clearer understanding of its behavior.