Best AI Skills — Tested Roundups

Install counts measure marketing, not quality. Each roundup in this series starts by installing every candidate skill in a domain, reading every file in every archive, and scoring them on a fixed rubric — instruction depth, file organization, language specificity, coverage breadth and practical usability — before naming a top five.

The pattern that shows up across domains: thin skills wrap the official documentation in a single Markdown file, while the ones worth installing encode the decision rules an experienced engineer carries in their head — when to reach for a pattern, not just what the pattern is. The reviews quote the files directly so you can judge that for yourself.