The SEO Audit skill turns “is this site SEO-broken?” into a structured report. It walks through the standard tech-SEO checklist (robots.txt, sitemap, canonicals, schema, internal linking) plus on-page (H1 hierarchy, intent match, internal-link density, word count vs. competitors) and returns a prioritized fix list.
What it produces: a Markdown report with three sections — Critical (blocks indexing or causes penalties), High (hurts rankings), Medium (best-practice gaps). Each finding has the offending URL, the issue, the fix, and a rough effort estimate.
Best for: founder-builders who don’t have an SEO consultant and need to know “what’s the most leveraged thing to fix this week?” Also useful as a pre-launch gate — run it before pushing a major redesign live.
Skip if: you already use Ahrefs/Semrush/Screaming Frog and have a dedicated SEO. This skill is a generalist’s tool; specialists’ tools go deeper on backlinks, SERP analysis, and competitor diff.
Setup gotchas: the skill is only as good as the page-by-page input it receives. For best results, pair it with Firecrawl MCP so it can actually fetch + render your pages, and feed it a representative sample (home, top 10 pages by traffic, 3 weakest pages). It cannot replace a real crawl — it’s a checklist applied to fetched HTML, not a discovery tool.
Real-world workflow: I run it monthly on 500k.io plus quarterly on each cluster hub. Most-recent run found 3 missing OG images, 2 thin-content pages, and a noindex header that shouldn’t have been there. Fix-list took 90 minutes of Vulcan time.
Compatible alternatives: Competitor Research for a paired competitive read, Firecrawl MCP as the fetching layer.
Run it pre-launch, monthly post-launch. Never let a 6-month gap form.