A chat assistant with memory you can inspect. Attune works out which of your messages say something lasting about you and files them as beliefs, so it can answer from what it already knows about you instead of asking again. Each belief links to the message it came from, so you can see what it knows and why, and correct or remove any of it.
Beyond chat and memory, Attune is built around interfaces: modules you turn on or off, each giving you a place to work and giving the assistant tools for the same place. It currently has only one, a calendar. You can run your schedule entirely through chat, entirely in the calendar, or move between the two. In chat, the assistant presents its work as artifacts: a calendar change arrives as one you apply or adjust, so it stays quick and nothing changes without you. Each interface is self-contained, so the design would easily accommodate others, such as tasks, personal finance or wellness, without changes to the rest.