Google's been mobile-first indexing for years now, so this skill handles the technical SEO side of that reality. It covers viewport meta tags, responsive design patterns, content parity checks between mobile and desktop, and mobile usability requirements like touch target sizing and font minimums. The skill also addresses the AMP question directly, which is refreshing: it's still supported but no longer gives you a ranking boost, so for most sites you're better off focusing on responsive design and Core Web Vitals. Use this when you're debugging mobile usability issues in Search Console or setting up proper viewport configuration.
npx skills add https://github.com/kostja94/marketing-skills --skill mobile-friendly