Confirms the essential page scaffolding — a title, a description and a charset — are present so the emitted block is usable as-is.
Reports the title length against the ~50–60 character SERP guidance. Over ~60 characters may get truncated in search results.
Reports the meta description length against the ~150–160 character SERP guidance. Long descriptions risk being truncated with an ellipsis.
Shows the fully resolved robots directive assembled from the index/noindex and follow/nofollow switches, plus max-snippet.
Confirms a canonical URL is set and warns if it is missing, since a missing canonical can allow duplicate-content dilution.