Developed and delivered a feature for the google/adk-java repository to enforce strict JSON Schema compliance in OpenAI API interactions, focusing on improving reliability and correctness of JSON payloads. The work involved enhancing the ChatCompletionsCommon and ChatCompletionsRequest classes in Java, adding robust parsing for tool call arguments and normalizing schema types to lowercase. Comprehensive unit tests were implemented to validate both valid and invalid JSON inputs, reducing the risk of 400 Bad Request errors from OpenAI. This approach strengthened API integration and maintainability, leveraging skills in API development, JSON Schema, and Java to ensure payloads consistently adhered to required specifications.