auditing-technical-seolisted

# Auditing Technical SEO ## Overview Technical SEO is the foundation. Content strategy, keyword work, and link building all assume that Google, Bing, and AI-search crawlers can actually fetch, render, and trust your pages. If any of those fail, nothing else compounds. In 2026 that surface is wider than it used to be: Core Web Vitals are still the user-experience signal Google measures at the **75th percentile** with thresholds **LCP < 2.5s, INP < 200ms, CLS < 0.1** [1], and a new tier of AI crawlers — GPTBot, ClaudeBot, Claude-SearchBot, PerplexityBot, Google-Extended, Applebot-Extended — now decides whether your content shows up in ChatGPT, Claude, and Perplexity answers [2][3]. ## What this skill checks - **Crawlability:** `robots.txt` parses cleanly, no accidental site-wide `Disallow: /`, sitemap referenced as absolute URL, sitemap reachable and valid, file under 500 KiB (Google's hard cap) [6][7]. - **Indexability:** GSC index coverage cross-referenced via `gsc-mcp`, canonical tags consistent and self-referential where appropriate, hreflang correct on i18n sites, no duplicate content via tracking parameters, no `noindex` on pages that should rank [5]. - **Rendering:** SSR/SSG vs CSR-only routes (CSR-only pages are largely invisible to GPTBot/ClaudeBot/PerplexityBot, which do not execute JS reliably), critical content not hidden behind hydration [2][3]. - **Core Web Vitals:** LCP, INP, CLS, TTFB measured at p75 via `lighthouse-mcp` (PageSpeed Insights / CrUX field data