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llms.txt generator.
Describe your site and list the pages that matter. The generator writes an llms.txt in the format proposed at llmstxt.org. It is a proposal, not a standard, so read what it can and can't do before you rely on it.
/llms.txt
Serve it at the root of your domain as text/plain or text/markdown. A section named Optional marks links that can be skipped when context is short.
What llms.txt is
A markdown file at your site root that points language models at your most useful pages, proposed at llmstxt.org.
What it isn't
It is not an access control. Crawler access is still decided by robots.txt. Test yours.
Ours, as an example
PreAEO publishes one at /llms.txt, generated from the same format.