What is MistralAI-User?
MistralAI-User · Mistral · User-action fetcher
MistralAI-User is Mistral's crawler. It fetches a page when a person asks the assistant about it. Fetches a page on behalf of a Le Chat user.
What it does
MistralAI-User fetches a page because a user asked about that specific link. Fetches a page on behalf of a Le Chat user.
It does not execute JavaScript. Whatever your server returns in the initial HTML response is the entire page as far as MistralAI-User is concerned — if your content is rendered client-side, this crawler reads an empty container.
Should you block MistralAI-User?
Only if you want out of Mistral's AI answers. MistralAI-User fetches a page when a person asks the assistant about it, so blocking it means your pages stop being available as a source there.
A Le Chat user who shares your URL gets a fetch failure instead of your content. As with other user-action fetchers, the loss is immediate and visible to a person.
To allow it
User-agent: MistralAI-User
Allow: /To block it
User-agent: MistralAI-User
Disallow: /Put the rule in your robots.txt at the site root. A group that names MistralAI-User explicitly takes precedence over your User-agent: * group, so naming it is how you make your intent survive later edits to the wildcard rules.
Verifying a real MistralAI-User request
This is a user-triggered fetcher, so requests arrive individually in response to a human action rather than as a crawl. Check source IPs against Mistral's published infrastructure rather than trusting the string.
The mistake people make
Omitting it from an allow list built around the American AI companies. European users reaching your content through a European assistant are still users.
Frequently asked questions
- What is MistralAI-User?
- MistralAI-User is Mistral's crawler. It fetches a page when a person asks the assistant about it. Fetches a page on behalf of a Le Chat user.
- Should I block MistralAI-User?
- Only if you want out of Mistral's AI answers. MistralAI-User fetches a page when a person asks the assistant about it, so blocking it means your pages stop being available as a source there.
- How do I block MistralAI-User in robots.txt?
- Add a group to the robots.txt at your site root: "User-agent: MistralAI-User" followed by "Disallow: /". Use "Allow: /" instead to allow it explicitly.
Further reading
- The Complete Guide to robots.txt for AI Crawlers: Which Bots to Allow
GPTBot vs OAI-SearchBot, ClaudeBot vs Claude-User, Googlebot vs Google-Extended: which AI crawlers to allow, which to block, and copy-ready robots.txt templates.
- How to Create and Optimize an llms.txt File for Your Website
The llms.txt format, where the file goes, how to keep it token-efficient, working examples for Next.js and static sites, and an honest account of who uses it.
- What is Generative Engine Optimization (GEO)? The Complete 2026 Guide
How ChatGPT Search, Perplexity and Claude find, read and cite pages, why that differs from Googlebot, and what the research says actually improves AI visibility.
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