Make your sitemap make sense
Inspect one XML sitemap or sitemap index. See entry counts, last-modified dates and obvious issues without crawling the URLs inside.
Small checks. Useful next steps.
Understand the result
A sitemap index points to other sitemaps. A URL sitemap lists pages. Lastmod should reflect meaningful changes, not a daily timestamp reset.
Keep it practical
Use clear, accurate metadata that helps people decide whether your page meets their needs. A preview is an editorial aid, not a ranking promise.
Know the limits
Slow, oversized or bot-protected sites may not be inspectable. That does not mean they are malicious. Checks are bounded and cached to keep this service free.