llms.txt

The short answer

llms.txt is a proposed standard, plain-text file placed at the root of a website that gives AI models a clean, curated summary of the site's most important content.

Full explanation

It works similarly to robots.txt or a sitemap, but instead of crawl rules or URLs, it offers a short, structured overview meant to help language models understand a site quickly. Adoption is still early and inconsistent across platforms, but it costs little to publish and signals a site is actively managing its AI presence.

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