Start an iMessage group with friends and Murph's number, send one message, and Murph comes alive in the room: it sets up the group's own private runtime, replies to that first message, and everyone in the chat can talk to it.
Inside a group Murph behaves like a participant, not a support desk. It sees who said what, knows when to reply, react, or stay quiet, and plays with shared challenge data without punching down.
iMessage · The boys