Quotes you in answers

Claude-User: what it is and how to allow or block it

If you block it, Claude (live browsing) can't read your site when someone asks about what you do, and it won't quote you. To show up in answers, let it in.

Check whether Claude-User can read your site

Tarsier tests your site with this and other AI crawlers and tells you who gets in, who doesn't and why.

What it is

Claude (live browsing). Opens your page when someone asks Claude for it.

Like most AI crawlers, it reads the HTML exactly as your server sends it: whatever your site paints with JavaScript may never reach it.

How it identifies itself

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

This is what it sends in the User-Agent header. In robots.txt you only use the short name: Claude-User.

The lines for your robots.txt

Allow it

User-agent: Claude-User
Allow: /

Block it

User-agent: Claude-User
Disallow: /
Build the full robots.txt

Other crawlers