llms.txt is useful only if it is treated as crawler-facing guidance inside a broader AI-readiness program. It clarifies priority content and boundaries without pretending it can force model behavior.
The practical role
Teams can use llms.txt to point AI readers toward canonical product, policy, support, and documentation pages. That can reduce ambiguity for systems that choose to read it, but it does not replace robots.txt, structured data, site architecture, or source-quality work.
What to avoid
The mistake is treating llms.txt like a magic answer-control file. A better pattern is to publish a concise, maintained index of important pages, then verify whether those pages are crawlable, fresh, cited, and reflected accurately in answer snapshots.