A liaison is posted to one conversation, briefed in your own words, and given a remit — what it may answer, what it may promise, and when it must come back to you. It never pretends to be anything but what it is.
Joins a group chat or DM on your real, linked number and answers as itself — never pretending to be you unless you set it up that way.
Calendar, Drive, Sheets, a site you're logged into elsewhere — each is its own switch. None are required just to use the assistant.
Every reply lands in its own thread. It never mixes silently into your own messages or sends anything you haven't scoped it to send.
A rough estimate, not a promise — drag to match your own week.