Developed an enhancement to the langgenius/dify repository by implementing support for the OpenAPI AllOf construct within property definitions, enabling more robust schema composition and improved reference handling in API specifications. This work, carried out using Python and leveraging expertise in API development and OpenAPI Specification, focused on reducing manual schema maintenance and increasing the reliability of client code generation. The feature was delivered with thorough documentation and unit testing, aligning with future goals for OpenAPI-driven governance and tooling. No major bugs were addressed during this period, as the primary focus remained on delivering a well-scoped, maintainable schema enhancement.