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AI crawler

AI crawlers collect the web to train models or respond in real time: GPTBot, ClaudeBot, PerplexityBot, Google-Extended, Applebot-Extended, CCBot. Each is controlled separately in robots.txt.

In practice

A useful distinction: training collectors build the long-term memory of models; search agents decide citations in real time. Blocking the first category on principle is debatable; blocking the second amounts to opting out of responses. Log audits reveal who actually visits — and at a frequency that often surprises.