Level$ — household finance, with a phone line attached
A budget app built for one household: real accounts synced through Plaid, a category model that matches how a family actually argues about money, and a callable phone number that answers spending questions against the same calculation the screen uses. The agent itself was the short part. The part worth reading about is the grounding attestation and the parity assertion — the machinery that stops it confidently delivering a well-formed wrong number.