During February 2025, Guang He developed a feature for the LianjiaTech/bella-openapi repository that enables the separation of reasoning content from main completion responses. Working in Java and focusing on backend and API development, Guang He modified several modules, including CompletionProperty, OpenAIAdaptor, ResponseHelper, and StreamCompletionCallback, to introduce specific tags that delimit reasoning text. This approach allows API users to clearly distinguish between reasoning and final outputs, improving traceability and downstream processing. The work enhances observability and debugging for API responses, supporting better analytics and compliance. The contribution was delivered as a single, cohesive commit with cross-module impact.