Individual skill

sitemap-valid

Use when applies to any site with a manually or programmatically generated XML sitemap. Use when debugging sitemap submission errors in Google Search Console.

skills/sitemap-valid/SKILL.md

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SKILL.mdcore · 2,120 bytes
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# Keep XML sitemaps valid

An invalid or malformed sitemap is silently ignored by search engines, leaving newly published or orphaned pages undiscovered by crawlers.

## Quick Reference

- The root element must be `<urlset>` with the correct `xmlns` namespace
- Each `<url>` must contain exactly one `<loc>` element with a fully qualified, percent-encoded URL
- Maximum 50,000 URLs and 50 MB per sitemap file; use a sitemap index for larger sites
- Encode XML special characters: `&` → `&amp;`, `<` → `&lt;`, `>` → `&gt;`, `"` → `&quot;`, `'` → `&apos;`

## Check

Fetch the sitemap and validate it against the sitemaps.org schema. Check that the `xmlns` attribute is `http://www.sitemaps.org/schemas/sitemap/0.9`, all `<loc>` values are absolute URLs, no file exceeds 50,000 URLs or 50 MB, and special characters are properly XML-encoded.