Worked on the openai/codex repository to enhance the Thread API by implementing the initialTurnsPage paging feature in the resume endpoint. This addition allowed clients to receive a configurable page of recent thread turns directly within the resume response, reducing latency by eliminating the need for a separate thread/turns/list call. The solution supported options for page size, sort direction, and item view, aligning with diverse client requirements and improving user experience. The work involved backend development and API design, utilizing Rust and TypeScript alongside Protocol Buffers to ensure efficient data handling and maintainability within the existing service architecture.