Why AI Needs Decoupled Specs: The Layered Development Approach

Spec-Driven Development fails when AI must resolve presentation, domain logic, and backend decisions simultaneously. By adopting layered SDD—where each layer (UI, data model, backend) is designed independently with its own focused specification—teams can dramatically reduce AI mistakes and achieve consistency. This insight reveals a fundamental truth: AI performs best on single-objective tasks, not coupled multi-layer problems.