Content-Signal in robots.txt

robots.txt

User-Agent: *
Content-Signal: search=yes, ai-input=yes, ai-train=no
Allow: /

search=yes Appear in search
May you be shown in regular search results?
Yes
ai-input=yes Used in AI answers
May your content be used when an AI answers a question?
Yes
ai-train=no Train models
May models be trained on your content?
No

They're only signals, but they show you've made an active choice

One line in robots.txt answers three questions: yes to appearing in search results, yes to being used as a source in AI answers and no to models being trained on the content.