Worked on the spring-ai repository to enhance the reliability of Anthropic integration’s streaming path by addressing a critical bug. Focused on backend development using Java and reactive programming, the solution involved replacing the switchMap operator with flatMap to ensure complete processing of streaming responses. This change prevented duplication of tool calls and ensured that the MESSAGE_STOP signal correctly marked the end of a message, eliminating the issue of resending the last content block. The fix, anchored to a specific commit for traceability, improved the stability and maintainability of streaming interactions, supporting more predictable downstream tool behavior in API integrations.