During August 2025, Duncan Brown focused on improving developer experience in the NHSDigital/prevention-services-design-history repository by streamlining tooling configuration. He identified and removed the redundant .tool-versions file, which duplicated settings already managed by .nvmrc and asdf, leading to conflicts with version managers. By consolidating configuration files, Duncan reduced onboarding friction and minimized tooling errors for the team. His work, primarily involving shell scripting and configuration management, enhanced the maintainability of the project’s development environment. The change was carefully documented and linked to issue tracking, reflecting a thoughtful approach to repository hygiene and collaborative software engineering practices.