During November 2025, competentml@gmail.com developed comprehensive OpenAPI documentation and an interactive Swagger UI for the Hasher-Matcher-Actioner (HMA) API within the facebook/ThreatExchange repository. Leveraging Python, Flask, and the flask-openapi3 library, they implemented detailed API schemas and response models to clarify API contracts and streamline integration for other developers. This work focused on enhancing the developer experience by providing accessible, interactive documentation, which facilitates faster onboarding and more reliable API usage. The contribution addressed the need for clearer API specifications, resulting in improved usability and maintainability for the HMA API, though no major bug fixes were completed during this period.