Worked on the alibaba/spring-ai-alibaba repository to address a critical issue in streaming output for AGENT_MODEL nodes. Focused on backend development using Java, the developer fixed a bug where the STOP status previously returned full content instead of null, which conflicted with version 1.1 semantics and introduced risks in downstream aggregation logic. By updating the NodeExecutor to emit null messages upon completion, the solution prevented chunked content leakage in StreamingOutput and maintained backward compatibility. The work was validated through targeted testing and careful review, ensuring stable streaming architecture and reducing the risk of data leakage for downstream consumers.