Knocklog

Claude-User

Anthropic's assistant acting for a person.

Operator
Anthropic
Type
Assistant acting for a person
In the user agent
Claude-User
robots.txt token
Claude-User
Follows robots.txt
says it follows robots.txt
Official documentation
support.claude.com
Checked on
2026-11-04

What is Claude-User?

Claude-User is Anthropic's assistant acting for a person. It fetches a page because someone asked an AI assistant a question right now. Each visit is a person waiting for an answer that may mention you.

The operator's description: Fetches pages when a Claude user asks a question. (support.claude.com)

How do I block or allow Claude-User?

With robots.txt, using the token Claude-User. Anthropic says it follows robots.txt. To block the whole site:

User-agent: Claude-User
Disallow: /

To allow it, use Allow instead of Disallow. Before blocking, weigh what it brings: every visit is a person asking an assistant for something; blocking takes you out of those answers.

How do I see whether Claude-User visits my site?

In your server or CDN access logs, look for Claude-User in the user agent. Google Analytics does not show these visits: agents do not run its JavaScript.

Anyone can copy the name in a user agent, so counting log lines is not enough. Knocklog reads your site's traffic on any host, confirms who is who, and shows how often Claude-User came, which pages it read and what that brought you.

How do I know it is really Claude-User?

Anthropic publishes Claude-User's IP addresses at https://claude.com/crawling/bots.json. A visit that claims to be Claude-User from outside those ranges is spoofed.

Knocklog runs this check on every visit and separates the genuine agent from impostors.

Does Claude-User visit your site?

See in seconds how your site treats AI agents. Then connect your traffic to learn who really came.

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