Meta has launched its new AI assistant app, Muse, for Mac users, enabling the artificial intelligence to directly interact with native applications such as files, messages, calendar, notes, and mail. This desktop release follows the initial mobile and web rollout earlier this month, which rapidly propelled the assistant to the top of the U.S. App Store charts. To address security concerns, Meta confirmed that desktop access operates on an opt-in basis, requiring explicit user approval before the application can perform any sensitive actions. The expansion intensifies the broader industry competition among consumer-facing AI agents, which tech leaders increasingly view as the future of personal computing. Why it matters: This launch heats up the race for consumer AI market share as major tech players rush to deploy autonomous desktop capabilities.