This video introduces Spec-Driven Development (SDD) as a critical methodology for modern software engineering, especially with the rise of AI agents that generate code at unprecedented speeds. It explains how SDD addresses the problem of ambiguity by making specifications the primary source of truth, outlines a four-step workflow, details three levels of SDD, and provides a practical checklist for when to implement it. The speaker argues that in a world of abundant AI-generated code, clarity becomes the most valuable resource, and effective communication with AI through precise specifications will define successful teams.