AI Crawlers
Quick answer
AI crawlers are bots operated by AI companies, such as GPTBot, ClaudeBot and PerplexityBot, that fetch pages across the web to train models or to retrieve content for a generated answer. They work similarly to a classic search engine's crawler but are controlled separately through robots.txt, and a page one of them can't reach can't be cited.
Why it matters
A site that blocks AI crawlers, intentionally or by accident through an outdated robots.txt rule, becomes invisible to the AI engines that would otherwise cite it, even if it ranks perfectly well in classic search. Knowing which AI crawlers are allowed or blocked is a basic, checkable fact that a lot of teams have simply never looked at, often because nobody owns that specific file once the site is live.
How to measure it
Check the site's robots.txt file directly for rules naming specific AI crawler user agents, and check server logs for whether those crawlers are actually visiting on top of being technically allowed to. Being permitted and being crawled are two different facts worth confirming separately, since a crawler can be allowed and still rarely show up for reasons unrelated to robots.txt.
Example
A company redesigns its site and copies an old robots.txt template that blocks several AI crawlers by name, a rule nobody specifically intended but that quietly sticks around. Months later, the team notices AI chat engines never mention recent product pages and traces it back to that one leftover rule blocking the exact bots that would have read them, a fix that takes minutes once found.
Frequently asked questions
How can a team check which AI crawlers are blocked?
Read the site's robots.txt file directly and look for rules naming AI crawler user agents like GPTBot, ClaudeBot or PerplexityBot, then confirm in server logs whether an allowed bot is actually showing up.
Should a brand always allow AI crawlers?
Most brands trying to be found and cited in AI answers want their public pages crawlable; blocking is a deliberate choice some sites make for other reasons, like limiting AI training on their content, and that trade-off is worth making deliberately rather than by accident, with a clear reason written down for whoever inherits the robots.txt file next.
Are AI crawlers the same as search engine crawlers?
No. Each AI company runs its own crawler separately from classic search engine crawlers like Googlebot, and each is controlled independently in robots.txt, so allowing one says nothing about the others.
How often should a robots.txt file be reviewed for AI crawler rules?
Whenever the site is redesigned or the template changes, and periodically otherwise, since a leftover rule from an old template is a common and easy-to-miss cause of blocked AI crawlers that nobody intended to block, and that nobody tends to notice until AI visibility is checked directly.
Related terms
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