This system isn't just an API; it is the core intellectual property for a highly scalable prop-tech operation. By completely decoupling the visual reasoning from the financial calculation, we guarantee that this engine will process tens of thousands of properties with institutional-grade financial accuracy.
The model gets a JSON schema with no cost field. It picks only from a closed vocabulary, 14 components and 44 defect codes, severity 0-4, extent 0-1. It has nowhere to put a price. A deterministic engine does the quantity takeoff from your property record and prices against a versioned cost book. Same observations in, identical dollars out.