Meta AI Updates: September 19, 2026

1. Muse Came to macOS With Access to Files, Mail, Messages, and Calendar

Meta released a Mac app for Muse, the personal AI agent it launched on iOS, Android, and muse.ai on September 8. On the desktop, Muse operates inside the native apps rather than a chat window, working with files, messages, calendar, notes, and mail to take actions on the user’s behalf. Meta says users control what Muse can reach and that it prompts before anything sensitive. Sessions carry across devices, so a task started on a phone can be picked up on a laptop or nudged through WhatsApp. Source