What is llms.txt, and should a firm publish one now?
llms.txt is a plain-text file at the root of a website that summarises the site for large language models: who it is for, what it offers, and links to the key pages. It is a curated index, not a replacement for the pages, and it sits alongside robots.txt.
Should a professional firm publish one?
It is cheap and it does no harm. Where a firm has a clear offer, an llms.txt lets an answer engine read the summary without parsing a whole page. It is one of the twenty-six checks in this audit, because it is a signal that a site has been made easy to read.
Run the audit to see whether your site publishes one.