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
User-agent strings are freely spoofed, so a UA match alone proves nothing. Confirm the source IP belongs to Mistral AI — published IP-range JSON where available, otherwise RDAP/rDNS on the IP. Full 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.
Vendor documentation: https://docs.mistral.ai/robots/
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.