Worked on the alibaba/spring-ai-alibaba repository to deliver a StreamingModelInterceptor enabling per-chunk processing of large language model outputs within ReactAgent. Applied Java, Reactive Programming, and the Spring Framework to enhance the streaming pipeline, introducing lifecycle callbacks for granular control and improved error handling. The implementation focused on isolating streaming subscriptions, increasing concurrency safety, and clarifying threading semantics through both code and documentation updates. Strengthened the developer experience by expanding end-to-end test coverage, introducing deterministic timeouts, and updating test scaffolding. These changes provided lower-latency, more controllable streaming responses and a more robust integration workflow for streaming large language model outputs.