Checks / AI crawler access
robots.txt blocks ClaudeBot
Blocks ClaudeBot, which collects training data. This keeps your pages out of future model training, not out of ChatGPT or other AI search.
robots_claudebot · AI crawler access · Notice
What triggers it
robots.txt does not let ClaudeBot fetch your home page (a Disallow rule in its own group, or in the * group when no group names it), and it leaves no other path open for it.
What to change
Only if you want your pages in future model training: remove the Disallow rule for ClaudeBot. Search inclusion is governed by Claude-SearchBot.
Example
Lines that allow ClaudeBot in robots.txt:
User-agent: ClaudeBot
Allow: /How to confirm the fix
- Open https://example.com/robots.txt: no group that names ClaudeBot (or the * group, if none does) disallows the home page
- Run a new crawl: the AI crawler table lists ClaudeBot as allowed
About ClaudeBot
ClaudeBot is Anthropic's crawler for content that could contribute to model training. A robots.txt Disallow signals that a site's future materials should be excluded from training datasets. Anthropic honours Crawl-delay, and warns that blocking its IP addresses can stop it reading robots.txt, so use robots.txt instead.
Anthropic says a restriction signals that the site's future materials should be excluded from its training datasets. The wording says "future materials"; it does not say what happens to content already collected. The other two Claude robots are separate, so blocking ClaudeBot leaves their rules untouched.
Job: Training. Follows robots.txt: Yes, it follows robots.txt and Crawl-delay.
ClaudeBot: operator, user-agent string and address list
How common it is
On a sample, the study measured robots.txt blocking ClaudeBot on the homepage's site: 10 of 294 Show HN sites (3%), and 0 of 67 Lovable sites (0%).
Fetched 20 and 21 Oct 2026 as CitedBot, robots.txt obeyed, no JavaScript. Study: Launch crawl 2026-10 (English).
About this check
| Check ID | robots_claudebot |
|---|---|
| Report section | AI crawler access |
| Severity | Notice |
| How it is decided | Measured: read directly from the page or the server's response. |
| Added | Before 19 Oct 2026 (versions 1 and 2), or a site-wide check with no version date yet |
| Status | Measured in every report |
| Report gives the code | Yes, one block for the site |
Settings by platform
For robots.txt, where the setting lives differs by platform. Our guides cover 13 of them: AI crawler settings by platform.
Related checks
- No llms.txt (optional)
- robots.txt blocks CCBot
- robots.txt blocks Google-Extended
- robots.txt blocks GPTBot
See whether it applies to your site
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