llms.txt is an emerging convention: a plain-text file at a website's root, written for AI systems, describing what the organisation is, what it offers, and listing the pages that matter with one-line descriptions. One fetch gives a machine the whole map — no JavaScript, no navigation, no guessing.
It costs an hour and is the cheapest clarity you can hand an AI reader. Ours is live at bva.agency/llms.txt, regenerated on every build — one deliverable of our SEO & GEO service.