Muse makes the secure execution environment part of the personal-agent product rather than an invisible infrastructure detail. This matters now because proactive agents need persistent state and authority, increasing the consequences of confused identity, weak isolation, or hidden actions.
Meta says Muse proactively helps with goals and can be addressed through the Muse application or directly in WhatsApp. Meta also says Muse runs inside a dedicated Muse Secure VM that houses both the agent and the person's data. The mechanism is an isolated personal workspace where the agent can retain context and take actions while the platform constrains access to user data and external capabilities.
A credible personal agent should expose what it remembers, which identity it used, what action it intends, and how the user can reverse the result. The evidence is Meta's launch description; independent security, privacy, reliability, and availability testing is still needed. Watch whether Muse publishes a clear permission model, audit history, data-retention controls, and recovery behavior for failed or unwanted actions.