“the way [Muse] is designed is there's a canonical main chat that is kind of very intentionally the primary main line, and we sort of feel like you could use that entirely if you wanted to. We know that for a lot of people, especially anyone that's used to the way most of these apps work today, that threading is a very useful way to organize. So we have side chats for that purpose. Like if you want to put something specifically in, like just to get it out of your main chat or it's like a very scoped problem for … there's lots of reasons why you might want to do it. That's why side chats are there, but it is definitely like a single thread with the possibility of side threads, whereas most apps are all threaded. That's kind of like the traditional model was like a new thread every time you open it, you know? And I think once the models were able to handle the context and be able to manage everything in a single chat, to me that is a little bit easier way to interface with what you feel like … the same way you would have with another person, you know”
Alex Cornell, Design director on Muse, Meta. Leads design on the product he describes, so he sees its design decisions first-hand; he is also promoting the product, and the episode is a guest interview, so what he says about how it is used is his own account and nothing measured.
How this was checked
Checked against the source by a first reader, then confirmed independently by a second reader who fetched the source without seeing the first reader's notes (Independent review agent (Claude Sonnet), blind second pass from passage text and citation only, no repository access, 2026-11-08).
All three segments match whisper.txt after normalization. The bracketed [Muse] stands in for the spoken word 'muse' in 'the way muse is designed is'. Located near 25:59 in whisper.srt. No captions.md.
How to cite this passage
Alex Cornell (Meta), “Meta Muse: the AI agent people actually love (How I AI, hosted by Claire Vo)”, How I AI (YouTube), 2026-10-12, at 26:02. https://www.youtube.com/watch?v=4TOLm1g-gCE Archived at https://the-ai-record.com/passages/meta-one-main-chat-with-side-chats-single-thread-possibility-of-side-threads-2026
Context. Cornell is responding to the host's description of generative UI in Muse, where the app's core elements stay fixed and parts inside them are generated.