In October 2026 I shared a LinkedIn‑style post that introduced Meta’s personal AI agent Muse, defined its core vocabulary, and laid out a quick‑setup checklist.
SOUL.md – This is the plain file where you write Muse's rules.
Goals – Muse breaks what you ask into goals and shows you the ones it's working on right now.
Chief of Staff – You tell Muse to act as your Chief of Staff and it asks you 20 questions, five at a time.
Approval card – Before Muse spends money or sends something, it shows you a card with a yes or no.
Library – Everything Muse finishes lands here.
Connections – Start with just those two.
Agent definition – Agent = Model + Harness. It's everything that isn’t the model.
Reach – Addy Osmani wrote that, and 857 K people saw it on X.