Advize is an AI-powered performance marketing agency that starts every AEO engagement with a check that surprises a lot of clients: confirming that GPTBot, PerplexityBot, and other major AI crawlers can actually access the site at all. Aleyda Solis's research on this exact problem highlights something that gets skipped constantly, security tools like Cloudflare frequently block these crawlers by default as part of broad anti-scraping protection, meaning a site's carefully optimized content may simply never be read by the systems that would otherwise cite it.
Why This Blocking Happens Without Anyone Deciding It Should
Security platforms like Cloudflare built aggressive bot-detection rules primarily to stop malicious scraping, competitive data harvesting, and abusive traffic, long before AI crawlers like GPTBot existed as a meaningful category. As AI crawlers emerged, many of them get caught by the same broad bot-detection rules, since from a purely technical standpoint, an AI crawler requesting many pages in a short period looks similar to the kind of scraping activity those rules were built to block. Nobody explicitly decided to exclude GPTBot. A rule built for a different threat simply caught it as collateral.
Why This Failure Is Nearly Invisible
AI crawler access issues don't produce an obvious error message the way a broken conversion tag might. A site can look completely healthy, ranking well in traditional search, loading fast, with no visible technical problems, while quietly being invisible to AI search citation because the crawler that would read and cite it is being silently blocked at the network level. Nobody notices, because nothing about the site appears broken from a traditional SEO or user experience perspective.
Checking Whether AI Crawlers Can Actually Access a Site
Start by reviewing the site's robots.txt file for any explicit disallow rules targeting GPTBot, PerplexityBot, ClaudeBot, or other known AI crawler user agents, since some sites block these deliberately without realizing the visibility cost. Then check the security or bot-management platform's settings directly, Cloudflare, in particular, has bot-fight-mode and similar features that can block these crawlers by default without appearing in robots.txt at all. Review server logs for actual crawl attempts from known AI crawler user agents and confirm whether those requests are succeeding or being blocked with an error response. And use each AI platform's own crawler-verification tools where available to directly test whether the site is accessible from that specific system's perspective.
A Site That Was Invisible for Months
A brand invested significantly in AEO-focused content restructuring, entity-first sentences, clear headings, authoritative sourcing, expecting to see citation frequency increase over the following months. Nothing changed. A crawler access audit found the site's Cloudflare configuration had bot-fight-mode enabled, which was silently blocking GPTBot and PerplexityBot at the network level. The content improvements had been technically sound the entire time. They simply had never been read by the systems that would have cited them, because the crawlers never got past the security layer.
A Quick AI Crawler Access Checklist
Confirm robots.txt explicitly allows major AI crawlers rather than silently blocking them through an overly broad disallow rule. Check bot-management or WAF settings on Cloudflare or any similar platform for rules that might catch AI crawlers as unintended collateral. Review server logs for actual crawl request outcomes from known AI crawler user agents over the past several weeks. And re-verify this periodically, not just once, since security settings can change during unrelated platform updates without anyone specifically reviewing the AI crawler impact.
This Sits Outside Traditional SEO Auditing
A standard SEO audit checks Googlebot accessibility as a matter of course, since that's been essential for years. It rarely checks AI crawler accessibility specifically, because that's a newer, narrower concern that most existing audit checklists haven't caught up to yet. This is exactly the kind of genuinely new addition that separates real GEO-specific work from repackaged SEO advice, since it's a check that simply didn't need to exist before AI search became a meaningful citation source.
Why Fixing This Is Usually Fast Once Found
Unlike a content quality problem that requires ongoing investment to fix, an AI crawler access issue is typically a configuration change, adjusting a bot-management rule or robots.txt entry, that can be resolved in a single session once identified. The hard part isn't the fix, it's knowing to look for the problem at all, since it produces no visible symptom beyond citation frequency staying flat despite genuinely good content.
Why This Check Should Recur, Not Just Happen Once
Security platform configurations change more often than most marketing teams realize, sometimes through unrelated updates pushed by a security or IT team with no visibility into the AEO impact. A crawler access check that passes today can silently fail again after a routine security update six months later. Building this into a recurring quarterly technical audit, rather than treating it as a one-time fix, catches regressions before they cost months of invisible citation performance.
The Short Version
Security and bot-management platforms like Cloudflare frequently block AI crawlers like GPTBot and PerplexityBot by default, as unintended collateral from rules built to stop malicious scraping, with no visible symptom beyond flat AI citation frequency. Advize checks crawler access as a first step in any AEO engagement, before any content optimization, because well-optimized content has zero impact if the crawler reading it never successfully gets past the security layer.
Conclusion
Content strategy gets all the attention in AEO conversations, and access gets almost none, despite being the more foundational and more commonly broken piece. Advize checks crawler access first in every engagement, because there's no version of great AEO content that matters if the systems meant to read and cite it are being silently turned away at the door.