The definition of done is one of the more underrated concepts in agile practice. A shared, explicit, team-level agreement on what it means for a story to be complete is the mechanism that prevents the slow accumulation of almost-done work that eventually freezes a sprint. Without it, done means different things to different people, and the gap is always paid for later. AI-assisted development introduces a new category of questions that most teams’ definitions of done do not yet address.