seo-crawl-render

Produces ONE PageSnapshot consumed by all other skills. Building it once is what makes the offline (Tier 0) audit possible.

PageSnapshot shape

{
  target: { kind: "url"|"path", value },
  status_chain: [ {url, status, location?} ],   // redirects, final status
  headers: { ... },                              // final response headers (incl. X-Robots-Tag, content-type, hreflang Link)
  raw_html: "...",                               // pre-JS HTML the crawler/AI sees first
  rendered_dom: "..."|null,                      // post-JS DOM (null if no render available)
  render: { needed: bool, used: "webfetch"|"playwright"|"firecrawl"|"none", confidence: "high"|"reduced" },
  artifacts: { robots_txt: "..."|null, sitemaps: [...], llms_txt: "..."|null },
  tier: 0|1|2
}

Acquisition

1. Local path: read files directly (Read/Glob); treat built HTML as raw_html. For framework source (Next/Nuxt/etc.), note the framework and that rendered output may differ from source.
2. URL: fetch with WebFetch (HTTPS-upgrade; if it returns a cross-host redirect, re-fetch the target). Capture status chain and headers. Fetch robots.txt, referenced sitemap(s), and /llms.txt.

Render decision

• --render static → never render. --render js → always try to render.
• --render auto (default): flag CSR when the raw HTML body is near-empty, has hydration markers (__NEXT_DATA__, window.__NUXT__, data-reactroot, a single root <div id="app">), or primary content/headings/links/JSON-LD are absent from raw_html.
• If rendering is needed AND a render MCP is available (Playwright/Firecrawl — discover via tool search), get the rendered_dom; set render.confidence = high.
• If needed but no render MCP: keep rendered_dom = null, set render.confidence = reduced, and emit an M4 finding: "CSR-only; audited from raw HTML; install a Playwright/Firecrawl MCP for full coverage." Never pretend you saw rendered content you didn't.

Tier

Set tier = 0 (WebFetch only), 1 (render MCP and/or PageSpeed available), 2 (Search Console / Merchant available). Downstream skills annotate findings needs_api when they require a higher tier than reached.