BLOCKED FROM CRAWLERS
/seller <- matched by "Disallow: /sell", is actually public marketing page
CONTRADICTIONS
5 URLs are in a sitemap AND disallowed
2 sitemaps generated but never declared in robots.txt
WRONG STATUS CODES
/catalog 200 but body is error state
/product/spin 200 but client-side render abort with no server content
METADATA
/catalog/duplicate duplicate title with /catalog/original
/product no canonical, reachable via 3 query permutations
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A Claude Code skill that audits the mechanical SEO failures nobody notices: robots.txt prefix rules that block far more than intended, sitemaps advertising URLs robots forbids, error pages served as HTTP 200 so crawlers file them as thin content, missing canonicals on filterable pages, and duplicate titles across your highest-intent routes. Verifies against the live site, because the deployed robots.txt is often older than the file in your repo.