What it does
MistralAI-Index is Mistral AI's ai search crawler. An AI search index that can cite and link your pages in answers (ChatGPT search, Perplexity, Claude search, Alexa, Siri). Blocking removes you from those answer surfaces — for most sites these are wanted crawlers.
Search-index crawler for Mistral search; docs state content is not used for generative-AI training.
Full UA: not captured in our July 2026 roster review — match log hits on the token MistralAI-Index (case-insensitive substring) and verify by IP before acting.
How to verify a hit is really MistralAI-Index
Verification method (July 2026): Published IP list: https://mistral.ai/mistralai-index-ips.json (fetched live 2026-08-22)
Strongest available check: the vendor publishes the crawler's egress IPs. Fetch the list, then confirm the hit's source IP falls inside it — a UA match from any other IP is a spoofer.
User-agent strings are freely spoofed, so a UA match alone proves nothing. Full step-by-step method: verify by IP.
Allow or block in robots.txt
Match the exact token MistralAI-Index in robots.txt:
# Block MistralAI-Index site-wide
User-agent: MistralAI-Index
Disallow: /# Explicitly allow MistralAI-Index
User-agent: MistralAI-Index
Allow: /For the allow-search-block-training combined pattern (and the Allow-directive gotcha that silently kills carve-outs), see the robots.txt guide. robots.txt governs whether MistralAI-Index may fetch; llms.txt is the separate, curated map AI assistants read once allowed in.
Vendor documentation: https://docs.mistral.ai/robots/
The Mistral AI family
Mistral AI operates 3 distinct tokens in this roster, and they do not block each other: a robots.txt line for MistralAI-Index does nothing to its siblings — each needs its own User-agent: entry (the robots.txt guide has combined patterns).
| Token | Role | robots.txt |
|---|---|---|
| MistralAI-User | User action | claims robots compliance |
| MistralAI-Training | Training | claims robots compliance |
Frequently asked questions
What is MistralAI-Index?
MistralAI-Index is Mistral AI's ai search crawler. An AI search index that can cite and link your pages in answers (ChatGPT search, Perplexity, Claude search, Alexa, Siri). Blocking removes you from those answer surfaces — for most sites these are wanted crawlers.
Does MistralAI-Index respect robots.txt?
Mistral AI claims MistralAI-Index respects robots.txt, but compliance is not independently confirmed.
How do I block MistralAI-Index?
Add 'User-agent: MistralAI-Index' followed by 'Disallow: /' to your robots.txt. Use the exact token — substring variants of other tokens will not match.
How do I verify MistralAI-Index traffic by IP?
Fetch Mistral AI's published IP list for MistralAI-Index and confirm the hit's source IP falls inside it — a MistralAI-Index user-agent from any other IP is a spoofer.
Related bots
Same vendor, then other ai search crawlers — the full directory profiles all 34.