Set robots.txt policy per AI crawler by its own token, and know that user-triggered fetchers ignore it

Mainstream crawlers from Google, other search engines and AI companies try to follow robots.txt, and nearly all AI crawlers use their own user agents, so a site can allow search crawling and refuse AI training per company; Google's token for that is Google-Extended (DEV-IDX-11), and said at Search Central Live, other companies have similar "extended" tokens, such as Apple's Applebot-Extended, which lets a site allow Applebot for search while opting out of Apple's AI use. User-triggered fetchers, which fetch a page because a user asked, and AI agents acting for a user generally ignore robots.txt.

Write one robots.txt group per AI crawler token you want to restrict, and keep Googlebot allowed. Avoid a default-deny file that blocks every crawler and allows only chosen ones: a Google panelist called it a bad pattern, because you do not know what you are blocking. When logs show an unknown crawler fetching a lot, look up its user agent to find the token that controls it. To restrict user-triggered fetchers or agents, use authentication or bot management, not robots.txt.

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Ein Audit liest die Antwort, die Header, das HTML, robots.txt, die Sitemaps und die Structured Data, und der Befund zeigt, was es gesehen hat.

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