If you're building Umbraco backoffice extensions, this shows you how extension types work together in practice. Instead of documenting individual components in isolation, it gives you complete working examples: a basic section with dashboard, a tree browser with workspace, and a full-stack notes app with C# backend. The enforced workflow (plan with wireframes, build, validate with the reviewer agent) might feel rigid, but it prevents the common mistake of picking the wrong extension type and having to rebuild. The examples folder is genuinely useful because you can copy and rename rather than starting from scratch. Think of it as blueprints rather than API docs.
npx skills add https://github.com/umbraco/umbraco-cms-backoffice-skills --skill umbraco-backoffice