llms.txt is an emerging standard: a simple Markdown file at yoursite.com/llms.txt that lists your key pages with short descriptions, so an AI model reading your site gets a tidy summary instead of having to crawl and guess. Think of it as a hand-drawn map you leave at the front door for the machines.
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.
The bigger point llms.txt gestures at is real: your site should be legible to machines, not just people. Clean structure, clear headings, honest descriptions, and schema markup do far more heavy lifting than the file itself. llms.txt is the polite note; the structured, well-built page is what actually gets read.
A tidy tosamarketing.com/llms.txt might list the services, the guides, and the glossary with a one-line description of each, so a model summarizing the business gets the important pages first instead of scraping the footer.
Go deeper: How to Get Your Business Cited by AI Search (2026).
This is part of our AI search (GEO) work.