Terry Herbert enhanced the NHSDigital/communications-manager-api repository by focusing on API documentation improvements and codebase maintainability. He updated the RoutingPlan API documentation using YAML, adding the 'name' and 'createdDate' properties to clarify schema details and streamline developer onboarding. His approach emphasized traceability, with all changes linked to specific commits for easy review. In addition to documentation, Terry prioritized repository hygiene through disciplined, non-functional housekeeping commits, ensuring a clean and consistent commit history. By leveraging skills in API documentation and version control, he supported integration readiness and maintained project conventions, contributing to a stable foundation for future development work.