Worked on the pydantic/pydantic-ai repository to deliver a feature that exposes the OpenAI API response ID as vendor_id within the ModelResponse object, supporting both streaming and non-streaming response paths. Used Python for backend development and API integration, ensuring that vendor_id propagates consistently through the response lifecycle to improve traceability and downstream analytics. Updated unit tests to include vendor_id in expected ModelResponse objects, enhancing test coverage and regression safety. Maintained code quality by limiting changes to targeted areas and keeping CI pipelines green. Focused on robust testing practices and clear API integration, with no major bugs addressed during this period.