Gemini CLI
Operated by Google
Google-Gemini-CLIAbout this crawler
Gemini CLI is Google's autonomous agents crawler. Browses on a person’s behalf to carry out a task rather than to read. It may follow links, fill forms, or move through several pages in one session.
A request from Gemini CLI usually means software is working through a task on a person’s behalf, so expect it to follow links and interact rather than read one page and leave.
User agent
Match on the token, not the whole header. Operators change version numbers and the surrounding text freely, so a substring match on the token is the only stable rule.
Mozilla/5.0 (compatible; Google-Gemini-CLI/1.0)
Typical shape. The exact header varies by operator and version.
Blocking it in robots.txt
User-agent: Google-Gemini-CLI Disallow: /
robots.txt is a request, not enforcement. Well behaved crawlers honour it; nothing stops one that does not.
Verifying a request really came from Gemini CLI
Scrapers routinely borrow a well known crawler's user agent to slip past rate limits. Checking takes three pieces.
1. User agent
What the request claims to be. It is a plain header that anyone can set, so on its own it proves nothing.
2. Request IP
The address the request actually arrived from. Your server sees it directly, and it cannot be set by the caller the way a header can.
3. Range check
This operator publishes neither IP ranges nor a reverse DNS convention. A request carrying this user agent cannot be confirmed as genuine, so treat the count as a claim rather than a fact.
If you need certainty for this one, the practical options are rate limiting by address or blocking it in robots.txt and watching whether the requests stop.
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