Check your llms.txt

Enter a site to fetch its /llms.txt, or paste the text. You get two separate readings: the structure the llmstxt.org proposal describes, and the three checks Lighthouse runs. Neither one says the file changes anything about how you appear.

What this checks

Format (llmstxt.org): a title as the first line, an optional blockquote summary, H2 sections that list links as - [name](url) with an optional note, and an optional section named Optional.
Lighthouse audit: a line starting with # , at least one Markdown link, and at least 50 characters. A 404 is not applicable. A 5xx, a 429 or a network error fails.
Practical notes: content type, relative links, duplicates, and whether up to 25 links respond. Cross-host links are skipped unless you ask.
Whether /llms-full.txt exists. It is reported, not validated.

What it does not measure

Whether any AI provider reads the file. Passing this check means the file is well-formed. No provider we checked has said an llms.txt file changes what appears in AI answers, and Google's documentation says Search ignores llms.txt. Lighthouse's check is experimental.
Whether the content is any good, or whether the linked pages can be indexed.
Rankings, citations or traffic.

More on the file itself in Do you need llms.txt or special AI files?

Sources

llms.txt is a small part of the picture. The free scan checks crawler access, indexability, sitemap and structured data.

Run the free scan