Whether ChatGPT, Perplexity and Claude can reach your content, and who they cite instead when they cannot.
Meta tags, heading structure, structured data, and how liftable your content is for an answer engine.
Page speed, LCP, CLS and INP, measured through Google PageSpeed Insights.
SSL configuration, security headers, and whether HTTPS is actually enforced.
Sitemap health, robots.txt rules, and whether your URLs are reachable at all.