Every AI bot · Anthropic

Claude-User

Anthropic's agent that fetches a page when someone asks its AI assistant about it.

In robots.txt: User-agent: Claude-User

Named by1.7%of readable robots.txt files on the top 1M (9,951 of 600,979)

Of those, block it32.9%shut it out of the whole site (3,273 of 9,951)

Same sites, since CC-MAIN-2026-34+0.0 ptsshare of the same 394,690 sites that block it by name: 0.4% → 0.4%

Via Cloudflare's file1.6%of its blocks come from Cloudflare's ready-made robots.txt (52 of 3,273)

32.9%

32.8%

34.4%

Block the whole site: 3,273Block some paths: 3,259Name it but allow it: 3,419

Every robots.txt file on the top 1M that names Claude-User, by what the rules that apply to it say.

Anthropic's other bots

Sites often treat one company's bots differently, depending on what each is for.

Bot	Purpose	Files naming it	Of those, block it
ClaudeBot	Collects pages to train AI	70,491	71.5%
anthropic-ai	Purpose not documented	28,018	62.2%
claude-web	Fetches a page for a chatbot user	21,076	65.7%
Claude-SearchBot	Builds an AI search index	10,987	36.2%

Who does what

The highest-ranked sites on the top million in each group. Click one to see its whole robots.txt verdict.

Block it

Block some paths

Name it and allow it

Lists skip sites we don't showcase (adult content).

What this means for you: blocking Claude-User asks Anthropic's assistant not to fetch your pages when someone asks about them. Decide each bot on what it's for, not who runs it.