Issue encyclopedia

Deterministic issue codes

Every Sitemapper diagnosis has a code, evidence, and a public explanation. AI never invents the underlying finding.

Issue codes

noindex URL listed in the sitemap Critical
NOINDEX_IN_SITEMAP
robots.txt blocks a sitemap URL Warning
ROBOTS_DISALLOWED_IN_SITEMAP
Canonical points at a different URL notice
CANONICAL_MISMATCH
Canonical points at another host Warning
CANONICAL_CROSS_HOST
Sitemap could not be fetched Critical
SITEMAP_FETCH_FAILED
No accessible XML sitemap Critical
NO_ACCESSIBLE_SITEMAP
Redirect loop Critical
REDIRECT_LOOP
Sitemap entry missing lastmod Warning
MISSING_LASTMOD
Duplicate title Warning
DUPLICATE_TITLE
Thin sitemap inventory Warning
THIN_SITEMAP
Sitemap URL returns an HTTP error Critical
BAD_STATUS