# John Mueller: no AI system currently uses llms.txt

> In June 2025 Google’s John Mueller wrote on Bluesky that no AI system currently uses llms.txt. What exactly he said, and what has and has not changed since.

Source: https://llmstextgenerator.com/llms-txt-news/mueller-no-ai-system-uses-llms-txt/
Last updated: 17 October 2026

Replying to a question on Bluesky, Google’s John Mueller wrote: “FWIW no AI system currently uses llms.txt.”

Happened on 17 June 2025

## What happened?

On 17 June 2025, replying to another user on Bluesky, John Mueller of Google wrote: “FWIW no AI system currently uses llms.txt.” Search Engine Roundtable reported it the next day.

## Is it still true?

It was an informal remark by one Google employee, not company guidance. What has changed since is mostly on the tool side: Google’s Lighthouse added an llms.txt check in May 2026, and research in August 2026 showed AI coding agents looking for llms.txt on their own. On the crawler side, none of Google, OpenAI, Anthropic or Perplexity says in its crawler documentation that it reads other sites’ llms.txt files (checked 17 October 2026).

## What does it mean for your site?

**Don’t publish llms.txt expecting AI search engines to read it.** The readers that do exist are mostly developer tools working with documentation.

## Sources

**Source:** [John Mueller on Bluesky](https://bsky.app/profile/johnmu.com/post/3lrshm4gggs2v)

**Coverage:** [Search Engine Roundtable, 18 June 2025](https://www.seroundtable.com/google-ai-llms-txt-39607.html)

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