Anthropic · User-triggered fetcher

Claude-User

Real-time fetch when Claude users click your links

Should you block it?

Safe to allow

Claude-User fetches a page in real time when a Anthropic user opens a link to your site inside a conversation. Blocking it breaks that click-through experience (users hit an error), but it does not affect indexing, citations or training.

How to allow it in robots.txt

User-agent: Claude-User
Allow: /

How to block it

User-agent: Claude-User
Disallow: /

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Other Anthropic crawlers

ClaudeBot — training / data crawler
anthropic-ai — training / data crawler
Claude-Web — training / data crawler
Claude-SearchBot — retrieval / search crawler

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