llms.txt Format Explained: Structure, Template and Common Errors

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llms.txt is a Markdown file served at /llms.txt that gives AI tools a short, curated list of a site's key pages. It is a community proposal from llmstxt.org first written in 2024, and it is optional rather than an official standard. The proposal defines a fixed order: a required H1 with the site name, an optional blockquote summary, optional detail sections, and H2 link lists, with an optional section for secondary links. The article provides an example template and explains how to publish the file and confirm it returns a 200 status with a non-HTML content type. It also notes that the author's own auditor checks only format compliance, and that the crawler documentation it reviewed treats robots.txt, not llms.txt, as the control for AI access.

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Python script or Firecrawl for llms.txt in 2026: the author's pick and why

The author recommends a small Python script run in CI for repo-hosted docs, which took about 47 minutes to build and costs nothing per deploy. Firecrawl's hosted generator is better when the source isn't under your control or when an llms-full.txt is needed from a live site, though its auto-written descriptions usually need rewriting. For very small sites, manually writing the file can be quicker than either option. The author also built a free, browser-based llms.txt generator after finding that other tools either routed sites through third-party servers or output bare links without descriptions. The piece walks through the llms.txt spec, including the required H1, optional blockquote, H2 link sections, and an Optional section for skippable content, and it describes how the author's 38-page documentation set was structured and generated.

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