Not really, but sounds interesting. Would you care to share some sites that offer better llms.txt than main web page? Or talk about some piece of info you easily found on llms.txt that was hard to navigate to on the regular website?

llms.txt usually includes a clear sitemap and description of information available on a site.

There are also clear definition of the restful scheme and API/data access options.

One very basic example would be the weather channel https://weather.com/llms.txt