Glossary
AIPREF training signal
In short
An IETF AI Preferences vocabulary for usage preferences. Google says it intends to read the training preference written as a user-agent line, __usage_ai-training, in early 2027. The robots.txt builder on this site does not write it. Related: What Content-Signals changes and Google-Extended profile.
Definition
An IETF AI Preferences vocabulary for usage preferences. Google says it intends to read the training preference written as a user-agent line, __usage_ai-training, in early 2027.
Sourced example
twitter.com's robots.txt already names __usage_ai-training (shared crawl, 2026-11-04); Google plans support in early 2027. Source, read 2026-11-04.
How it shows up here
The robots.txt builder on this site does not write it.
Previous: ai-input. Next: Applebot-Extended. All 41 terms.
Sources
Last reviewed 2026-11-04