Checks / AI crawler access
robots.txt blocks Claude-User
Claude-User fetches a page when a person asks that assistant about it.
robots_claude_user · AI crawler access · Error
What to change
Remove the Disallow rule for Claude-User in robots.txt.
Example
Lines that allow Claude-User in robots.txt:
User-agent: Claude-User
Allow: /How common it is
We have not measured how common this is on a sample of sites. Counts appear here when a study covers it.
About this check
| Check ID | robots_claude_user |
|---|---|
| Report section | AI crawler access |
| Severity | Error |
| 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.
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