What does Claude-User do?

Claude-User is used by Claude (live browsing). It fetches a page live when a user asks about it.

Should I block Claude-User?

Usually not. This crawler is how Claude (live browsing) reaches your pages when answering a question, so blocking it removes you from answers you could have been cited in.

Yes, and there is no signup. We fetch one public file, robots.txt, and read the rules for this user-agent. You see the full result, including every failure we find.

Is Claude-User blocked on your site?

Claude-User is the Claude (live browsing) crawler that fetches a page live when a user asks about it. If your robots.txt blocks it, that engine cannot read your pages, and a page it cannot read is a page it can never cite.

Free, no sign-up. We fetch one public file and read it. Nothing is stored.

Questions

What does Claude-User do?: Claude-User is used by Claude (live browsing). It fetches a page live when a user asks about it.
Should I block Claude-User?: Usually not. This crawler is how Claude (live browsing) reaches your pages when answering a question, so blocking it removes you from answers you could have been cited in.
Is this check free?: Yes, and there is no signup. We fetch one public file, robots.txt, and read the rules for this user-agent. You see the full result, including every failure we find.

Check something else

Is ClaudeBot blocked on your site?Tests the ClaudeBot user-agent specifically, which builds the index the model answers from.
Is Claude-SearchBot blocked on your site?Tests the Claude-SearchBot user-agent specifically, which fetches pages when someone runs a search in the assistant.
Is Perplexity-User blocked on your site?Tests the Perplexity-User user-agent specifically, which fetches a page live when a user asks about it.
Is Claude-Web blocked on your site?Tests the retired Claude-Web token, so you learn whether you are keeping a robots.txt rule that no longer matches any live crawler.