← AI crawler directory
AI agent
Claude-User
AnthropicHonours robots.txt
Fetches a page because a Claude user's request required it. Blocking prevents Claude users from reading your pages in-session.
User-agent string
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko); compatible; Claude-User/1.0; +Claude-User@anthropic.com
How to verify it
Anthropic publishes crawler IPs at claude.com/crawling/bots.json.
What blocking costs
Blocking prevents Claude users from reading your pages in-session.
robots.txt rule
# Block Claude-User
User-agent: Claude-User
Disallow: /
# Allow everything else
User-agent: *
Allow: /Robots.txt is enough
Anthropic documents Claude-User as honouring robots.txt. Verify with your logs after deploying — a spoofed agent will keep coming.
Generate a full robots.txt
Pick which AI crawlers to allow or block across all 42 agents and copy the file out.
Open the generator →Other Anthropic agents