Day 18 / 100AI Crawlers · SEO
Your Website Is Hiding From ChatGPT
A surprising number of robots.txt files block AI crawlers by accident — copy-pasted boilerplate from an old template, or an overcautious “block all bots” rule added for a completely different reason years ago. If that's true for your site, you're not losing ground in AI answers — you were never in the running to begin with.
The crawlers that matter right now
| User-agent | Company | What it affects |
|---|---|---|
| GPTBot | OpenAI | Training & ChatGPT browsing |
| ClaudeBot | Anthropic | Training data & Claude's web access |
| PerplexityBot | Perplexity | Answer generation & citations |
| Google-Extended | Gemini & AI Overviews (separate from classic Googlebot) | |
| Amazonbot | Amazon | Alexa & shopping-related answers |
How to actually check your site
Open robots.txt→
Check for Disallow→
Check llms.txt exists→
Test a live fetch
- Open
yoursite.com/robots.txtdirectly in a browser. - Search for each crawler name above — an explicit
Disallow: /under any of them blocks that platform entirely. - Check whether an
llms.txtfile exists at the root — a growing, informal convention that gives AI systems a map of what's safe and useful to read. - If unsure, test with a live URL-fetch tool to confirm the page actually returns content to that agent, not just that robots.txt allows it.
What “allowed” actually controls
Being blocked doesn't lower your ranking anywhere — it simply makes your business invisible to anything that model answers. It's a binary exclusion, not a penalty you can partially recover from with better content.
Read this with healthy skepticism
- Being crawlable doesn't guarantee being cited — it's a necessary condition, not a sufficient one.
- Allowing every crawler isn't automatically right for every business; if you have real reasons to block AI training (not just inherited defaults), that's a legitimate choice to make deliberately, not by accident.
Free Mind audits crawler access as part of every AEO engagement — being invisible to an AI crawler isn't a ranking penalty, it's a hard exclusion.
Explore AEO services
Sources: Publicly published robots.txt directives and crawler documentation from OpenAI, Anthropic and Perplexity.