We Blamed Our Rules. The 4B Model Was the Ceiling.
Our lead triage sorts estate-agency enquiries on a Mac mini. A decision model, Kev-4B, answers closed questions about each message: what the sender wants, how soon, whether they are qualified. It returns a probability for each option and writes no text. The agency’s written rules, in code, turn those answers into an urgency and a next step. Some rules use cuts, probability thresholds such as “business pitch ≥ 0.60 → spam”. We measured it on synthetic enquiries and published every message. ...