llms.txt: The AI Content Guide File That Controls Nothing but Clarifies Everything

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llms.txt is a proposed community convention, introduced at llmstxt.org in late 2024, that places a hand-curated Markdown file at a website's root to help large language models quickly identify the most important pages. Unlike robots.txt, it does not control crawler access in any way — it simply acts as a prioritised table of contents for AI agents working within limited context windows. The file is deliberately minimal, using standard Markdown with a site name, optional summary, and categorised links to key pages. It differs from sitemaps, which exhaustively list all URLs, and from structured data, which annotates individual pages rather than guiding site-level navigation. Adoption is growing mainly among documentation sites and developer tools, though whether major AI answer engines actively read it remains an open and honestly unresolved question.

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