Do You Need to Add llms.txt to robots.txt?
Sergey Carp from Cincinnati, Co-founder / CTO
No. There is no robots.txt directive for llms.txt, so there is nothing to add. The file is found at its standard address, example.com/llms.txt, the same way robots.txt is found at example.com/robots.txt. A line pointing to llms.txt in robots.txt will not help AI assistants discover it.
Key takeaway
No. There is no robots.txt directive for llms.txt. What matters is that the file loads correctly and AI crawlers aren't blocked from your site.
What robots.txt does affect is whether AI crawlers are allowed to visit your site at all. That is where the real problems usually hide.
An llms.txt checklist: what to verify
Before reaching for an llms.txt checker or validator, run through these points yourself:
- the file opens without a login or redirect and returns a 200 status code;
- it is served as plain text in UTF-8 encoding, not as an HTML page;
- it follows the basic Markdown structure: company name, short description, sections with links;
- robots.txt does not block the AI crawlers you want to reach your site, such as OAI-SearchBot, Claude-SearchBot or PerplexityBot;
- bot protection on your server, firewall or CDN is not silently blocking those crawlers;
- every link inside the file leads to a working page.
Online validators can confirm the format and flag broken links, but they cannot tell you whether the facts in the file are current or whether AI crawlers are actually getting through. Your server logs show that.
The most common mistake
A carefully written llms.txt on a site that is closed to AI crawlers. In that case the file is useless: an AI assistant cannot open it, and it cannot open the pages it links to either. Keep in mind, too, that llms.txt was proposed in 2024 and major AI providers have not officially confirmed they use it, so crawler access and clear pages matter far more than the file itself.
If you are unsure which bots to allow, read our guide on which AI crawlers to let on your site.
At AI Search Optimization, we check AI crawler access, robots.txt and llms.txt as part of every AI visibility audit, for $290 per month including the first 10 hours of work. Book a call.