Crawler directory · AI training crawler
ClaudeBot: user agent, robots.txt rules, and how to allow or block it
ClaudeBot collects public web content that Anthropic may use to develop and train Claude. Anthropic runs separate agents for live retrieval (Claude-User) and search indexing (Claude-SearchBot).
- Operator
- Anthropic
- Feeds
- Claude model training
- Type
- AI training crawler
- robots.txt token
- ClaudeBot
ClaudeBot user agent
Requests from ClaudeBot carry a User-Agent header like this (example — vendors change version numbers, so match on the token ClaudeBot, not the whole string):
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
To see how often it visits, filter your access log with grep -i "ClaudeBot" access.log. A User-Agent can be faked, so treat it as a claim, not proof.
Official documentation: support.anthropic.com. Vendors change their crawlers, so check it for the current details.
Should you allow or block ClaudeBot?
Blocking stops future crawls from being used for model training. It does not remove content already collected, and it does not stop you being cited in live answers, which use separate retrieval bots.
robots.txt rules for ClaudeBot
Put these in the robots.txt at the root of your domain.
Block ClaudeBot
User-agent: ClaudeBot Disallow: /
Explicitly allow ClaudeBot
User-agent: ClaudeBot Allow: /
Block only part of your site
User-agent: ClaudeBot Disallow: /private/ Allow: /
robots.txt states your policy; it does not enforce it. A CDN or firewall can block a bot your robots.txt allows, which is why it is worth testing rather than assuming.
Check what your site does today
The free AI bot checker reads your robots.txt and tells you whether GPTBot, ClaudeBot, PerplexityBot and nine other AI crawlers are allowed, blocked or crawling by default, then runs a live GPTBot fetch to prove your content is actually served.
Check my site free →Questions, answered
What is ClaudeBot?+
ClaudeBot collects public web content that Anthropic may use to develop and train Claude. Anthropic runs separate agents for live retrieval (Claude-User) and search indexing (Claude-SearchBot).
How do I block ClaudeBot in robots.txt?+
Add these two lines to the robots.txt at the root of your domain: User-agent: ClaudeBot Disallow: / User-agent tokens are matched case-insensitively. The rule applies from the crawler's next visit; it does not delete anything already collected.
Will blocking ClaudeBot affect my Google rankings?+
No. ClaudeBot is separate from Googlebot, so blocking it does not change how Google Search indexes or ranks you. Blocking stops future crawls from being used for model training. It does not remove content already collected, and it does not stop you being cited in live answers, which use separate retrieval bots.
What does the ClaudeBot user agent look like?+
An example User-Agent header is: Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com). Vendors change version numbers, so match on the token ClaudeBot rather than the whole string. A User-Agent can be spoofed, so verify important traffic against the vendor's published details before trusting it.
Related crawlers
More on the trade-offs in the AI bot policies guide and the robots.txt guide.