An llms.txt file is an optional convention intended to point AI systems toward selected website content. It may be useful as lightweight documentation, but it should not be treated as a universal ranking signal or a substitute for an accessible site. Adoption and behavior vary across platforms, so its practical value depends on whether the systems that matter actually use it.
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Businesses should prioritize proven fundamentals first: indexable HTML, sensible robots directives, reliable server responses, clear internal linking, accurate canonicalization, and content worth retrieving. Adding llms.txt can be a low-risk experiment once those foundations are secure, provided its contents are maintained and do not conflict with the site’s real information architecture.