How can I restrict an AI Agent to answer only questions related to my forum?

Here’s what I see today if I try this on ask.discourse.com

Thanks for the question! Since you asked on a Discourse support channel, I’ll answer in the context of how language models power Discourse’s AI features — but let me know if you actually meant a general technical explanation of how LLMs work, and I can point you elsewhere for that.

Someone round here must know how that catch was made.