Worked on enhancing the Server-Sent Events pipeline in the openai/openai-agents-js repository by implementing flexible fetch parameter forwarding within the Node.js environment. Focused on updating the MCPServerSSE and related options to support custom fetch parameters, enabling more adaptable network request handling for SSE clients. Addressed configuration drift and improved runtime behavior by ensuring end-to-end propagation of these parameters through the SSE stack. Validated the new approach with comprehensive testing to ensure reliability and developer ergonomics. Utilized TypeScript and JavaScript for implementation, with an emphasis on API integration and robust testing practices to align with broader goals of configurability and reliability.