A comprehensive reference for all 23 Gang of Four design patterns that cuts against the usual pattern evangelism. It gives you quick lookups, practical examples, and decision frameworks, but the real value is the philosophy: it actively warns you against over-engineering and won't recommend a pattern unless you have two concrete use cases right now. Covers creational, structural, and behavioral patterns with progressive disclosure through supporting files for antipatterns and production examples. Refreshing to see a patterns resource that treats YAGNI and simplicity as first-class concerns instead of encouraging you to factory-factory-builder everything into oblivion.
npx skills add https://github.com/rysweet/amplihack --skill design-patterns-expert