Allowing the major AI crawlers is the most overlooked prerequisite for AI visibility — not because permitting them boosts you, but because blocking them can quietly erase you. Assistants and their retrieval systems rely on bots like GPTBot (OpenAI), ClaudeBot (Anthropic), PerplexityBot and Google-Extended to read and index the live web. If your robots.txt disallows them — often a default that a developer, security plugin or CDN setting added without anyone deciding to — you can be a perfect entity with great reviews and still be absent from the answer, because the model was never allowed to read you. Unblocking them doesn't guarantee a recommendation; it just puts you back in the running. The move is to audit your robots.txt and CDN bot rules, confirm the AI crawlers you want reaching you are allowed to, and only then invest in the citations and entity signals that decide who gets named.
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