What is Google-Safety?
A Google-Safety request is an abuse check. Google's own example is malware detection for a link posted publicly on a Google property. That makes the visit different from Googlebot's routine work of discovering pages for Search.
Google identifies the client with Google-Safety inside a browser-like header. It belongs to Google's special-case crawler class, whose requests can be checked against the published special-crawler address ranges. Google's documented reverse and forward DNS procedure offers another way to confirm the source.
Crawl preferences do not govern this agent. Google states that Google-Safety is unaffected by robots.txt, so neither a wildcard disallow nor a named group is expected to prevent the fetch. A server can still require authentication or reject the request at the network edge.
The documented purpose is safety investigation, not AI discovery. Google does not say that Google-Safety retrieves material for generated answers or model training, and the agent is not evidence that a URL entered the regular Search index. Blocking it only prevents that safety request from reaching the resource.
