Key takeaways
- llms.txt is a plain-text file listing your key pages for AI systems.
- Google says it does not use llms.txt for Search, AI Overviews, or AI Mode.
- It's optional and harmless; it may help some non-Google AI tools.
- Don't treat it as a ranking or citation lever.
llms.txt is a proposed plain-text file placed at your domain root (/llms.txt) that lists your most important pages and a short site description for AI systems to read. It is optional. Google has stated it does not use llms.txt for Search, AI Overviews, or AI Mode, so it is not a ranking or citation lever, though it may help some non-Google AI tools.
What it looks like
The format is simple Markdown: a title, a one-line description, then linked sections.
# Your Site
> One-line description of the site.
## Guides
- [Page title](https://example.com/page): short description
- [Another page](https://example.com/other): short descriptionDoes it actually help?
For Google, no, and that is straight from Google's AI optimization guidance. Studies of AI systems have also found little evidence that llms.txt drives citations today. The signals that genuinely move AI visibility are content quality, structure, and brand mentions and entity trust, not a text file.
Should you add one?
It's fine to add, it takes five minutes and has no downside, but spend your real effort on citation-worthy content and structured data. The same "is this hyped or real" question applies to FAQ schema for AI search, and the answer there is similar. We publish one on this site as a nice-to-have, not because it ranks us.
Bottom line: add it if you like, then ignore it and go do the work that matters, covered in the AI SEO course.