Crawls up to 100 pages and emits an honest sitemap.xml — <loc>
and a real <lastmod> only, never the priority/changefreq
fields Google's own docs say it ignores.
A sitemap is a list of the URLs you want found. It does not make a page rank, and it is not a substitute for links — but a page nothing links to and no sitemap mentions is a page that may simply never be discovered.
It crawls your site from the homepage, follows internal links, skips anything your robots.txt disallows, and emits a valid sitemap.xml you can download and submit to Search Console. The free version crawls up to 100 pages.
Google ignores `priority` and `changefreq` outright — it has said so plainly. `lastmod` it does use, but only if you're honest with it: a date that updates on every deploy whether or not the page changed is noise, and Google learns to discount it. Set it when the content actually changed, or leave it out.
What XML sitemap best practices require — the longer version, with sources.