Meta closed its Connect 2026 keynote on September 23 with a keychain that hooks you on AI. Mark Zuckerberg pulled out a small, puck-shaped device about the size of an old Tamagotchi and called it Muse Charm, a physical way to carry around Muse, the company's personal AI agent. An AI agent, in Meta's telling, is software that can take actions for you, like booking a flight or sending an email.