READ-ONLY, platform-agnostic site auditor. Works on ANY website (WordPress, Shopify, custom, static — anything). Audits SEO, GEO/AEO and speed: it SHOWS problems and gives CMS-neutral 'how it should be' recommendations — it does NOT modify the site; you decide whether/how to fix. Discovers pages via sitemap.xml (polite ~1 req/sec, default 25 / max 100 pages), fetches each page's HTML, and runs: title/meta-description length, image alt text, H1 count, emoji/overlong/before-H1/broken-hierarchy headings, mixed content, JSON-LD Article author/dates + structured-data validity, AI-restrictive meta robots, /llms.txt, robots.txt AI-bot blocking, canonical, viewport, Open Graph — PLUS always-on speed heuristics (render-blocking head resources, images missing width/height, un-lazy offscreen images, large inline blocks, page weight, DOM size). When PAGESPEED_API_KEY is set, it also runs Google PageSpeed Insights (Core Web Vitals + Lighthouse opportunities) on a small sample of pages. Returns a per-pillar summary {seo, aeo, speed} (score + health_label + issue count) and a flat issues[] where each item = {code, category, severity, url, evidence, why, target_state, recommendation}.

READ-ONLY speed-only audit of ONE page. Always runs the HTML speed heuristics on the fetched page; when PAGESPEED_API_KEY is set it also runs Google PageSpeed Insights (mobile) for that page and returns Core Web Vitals (LCP, CLS, INP, TBT, TTFB) plus the top Lighthouse opportunities. Every finding carries category 'speed' and a 'how it should be' recommendation. Use audit_site for a whole-site, multi-pillar audit.