During September 2025, this developer delivered a major API refactor for the cli/cli repository, focusing on backend development and API integration using Go. The work centered on shifting agent session data access to resource-based endpoints, introducing a new Resource struct and updating the ListSessionsByResourceID function to align with the revised API response. By enabling direct resource fetching and adjusting pull request ID generation for hydration, the refactor reduced API round-trips and improved performance. The changes were implemented with careful attention to backward compatibility and documentation, resulting in a streamlined, resource-centric workflow that simplifies maintenance and supports future scalability.