What is an llms.txt file and do I need one?

An llms.txt file is a plain-text Markdown file you publish at your domain root (yourdomain.com/llms.txt) that gives AI models and their crawlers a clean, curated map of your site: what you do, who you're for, and links to your most important pages with short descriptions. Think of it as a robots.txt-style convention, but instead of telling crawlers what not to read, it hands language models a concise, human-written summary of what matters — so they don't have to infer it from a sprawling, JavaScript-heavy site.

What it's for

Modern sites can be hard for AI browsing tools to parse: content buried in scripts, important context spread across many pages, marketing copy that's long on adjectives and short on plain facts. An llms.txt file cuts through that by stating, in clean Markdown, exactly what your product is and where the substantive pages live. It makes you easier to read accurately.

Do you need one?

It's a "helps, doesn't guarantee" measure. Publishing llms.txt won't force any assistant to name you, and adoption across models is still uneven and evolving. But it's low-effort and low-risk: a clear, honest llms.txt makes it more likely that when a model does read you, it categorizes and describes you correctly rather than vaguely. For a page or two of effort, that's a reasonable bet.

What good llms.txt looks like

• A one-line, plain-English statement of what you are and who it's for.
• Links to your core pages (product, pricing, key docs) each with a short, factual description.
• No fluff, no keyword stuffing — models reward clarity, not adjectives.

The honest test, as always, is measurement: publish it, then re-probe the engines over the following weeks to see whether your mentions or the accuracy of your descriptions improve.