llms.txt is an informal, emerging convention: a Markdown file at yoursite.com/llms.txt that lists key pages with short descriptions. Some publishers use it as an extra machine-readable guide, but major AI platforms do not promise that it will affect discovery or citation.
It is worth being straight about where this stands: llms.txt is a proposed convention, not something every major AI company has committed to honoring yet. Adoption is early. Adding one is low-cost and low-risk, and it signals that you are thinking about AI readability, but do not expect it alone to move rankings. It is a small tidy-up, not a silver bullet.
Major platforms do not promise to use the file, so crawlable, accurate pages remain the priority. Treat llms.txt as an optional index, not a replacement for normal search indexing, navigation, or a sitemap.
A tidy tosamarketing.com/llms.txt can list the services, guides, and glossary with a one-line description of each. It helps only if a tool chooses to request and use the file.
Go deeper: How to Get Your Business Cited by AI Search (2026).
This is part of the AI visibility work.