Training only
Applebot-Extended: what it is and how to allow or block it
Blocking it keeps your text out of future model training, but doesn't remove you from answers: other bots handle that. It's a legitimate choice either way.
What it is
Apple Intelligence. It doesn't crawl: it decides whether what Applebot already read can train Apple's AI. Siri and Spotlight stay the same.
Like most AI crawlers, it reads the HTML exactly as your server sends it: whatever your site paints with JavaScript may never reach it.
How it identifies itself
Mozilla/5.0 (compatible; Applebot/0.1; +http://www.apple.com/go/applebot)
This is what it sends in the User-Agent header. In robots.txt you only use the short name: Applebot-Extended.
The lines for your robots.txt
Allow it
User-agent: Applebot-Extended Allow: /
Block it
User-agent: Applebot-Extended Disallow: /