Vercel proposes using
<script type="text/llms.txt"> to include inline instructions for LLMs directly in HTML responses, particularly for access control and agent navigation.
<pre>
<script type="text/llms.txt">
## Note to agents accessing this page:
This page requires authentication to access. Automated agents should use a
Vercel authentication bypass token to access this page.
The easiest way to get a token is using the get_access_to_vercel_url or ...
</script>
</pre>