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Agent directory · AI assistant

Claude-User

Fetches a page when someone using Claude asks about it or shares a link. It acts for one person, in real time.

Run by
Anthropic
Type
AI assistant
Robots.txt name
Claude-User
Verifiable
No

What Claude-User does

Fetches a page when someone using Claude asks about it or shares a link. It acts for one person, in real time.

As an AI assistant, it fetches pages for a person, in real time, while they use an AI assistant. The kinds of AI agent that visit websites.

Should you allow it?

Almost always allow it. Blocking it means the assistant can't read your pages when a customer asks about you, so it answers from somewhere else. A decision guide for blocking or allowing AI crawlers.

How to allow or block Claude-User

Claude-User reads the Claude-User group in your robots.txt. To block it everywhere:

User-agent: Claude-User
Disallow: /

To allow it everywhere, even if another rule blocks other bots:

User-agent: Claude-User
Allow: /

Robots.txt is a request, not a lock: well-behaved crawlers follow it, impostors don't. Robots.txt for AI agents.

How it identifies itself

A typical user agent:

Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Claude-User/1.0; +Claude-User@anthropic.com)

How to tell if it's really Claude-User

Anthropic doesn't publish IP ranges or a reverse DNS domain for Claude-User, so a request can't be proven to come from it. Anyone can send its user agent, so treat the name alone as a claim, not proof. Ghost Agent Lab reports these requests as unverified rather than guessing.

Every Anthropic agent, and a robots.txt for all of them →

Does Claude-User visit your site? Ghost Agent Lab reads your CDN or server logs and shows every request from Claude-User and 1,566+ other known agents: what they read, what your site sent back, and whether each request was genuine. See agent traffic, or check whether AI agents can use your site for free.