In one sentence
llms.txt is a file for AI crawlers (GPTBot, Claude-Web, etc.) that conveys "this is how our site is organized" in Markdown. It is placed at the site root (/llms.txt).
What does this look like in practice?
For example, you create a file at https://example.com/llms.txt and write something like:
# Example Corp
> Example Corp provides B2B SaaS sales-support tools.
## Services
- [Product overview](https://example.com/product)
- [Pricing](https://example.com/pricing)
## Learning resources
- [User guide](https://example.com/docs)