Worked on the spring-ai repository to deliver two backend features focused on enhancing enterprise integration and flexibility. Developed improvements to the OpenAiChatModel by enabling preservation and replay of provider-specific metadata during conversations, using Java and the Spring Framework to serialize and deserialize tool-call properties for both synchronous and streaming interactions. Additionally, implemented support for custom metadata field names in Milvus filter expressions, increasing the adaptability of metadata-based filtering. Both features were supported by comprehensive unit testing and updated documentation, ensuring maintainability and clear guidance for users. The work emphasized robust API integration and backend development practices throughout the month.