Vibe-coding is fun until you can’t remember why the code does what it does. Spec Driven Development is the grown-up sibling: you write down what you want and why, the spec, and let that document drive the implementation, whether the programmer is a human or an AI agent.
The spec becomes the durable artifact: code can be regenerated, conversations get lost, but the decisions survive. It’s exactly how this site’s Karpathy Method adapted to WWtGDO pipeline was built, a SPEC.md first, the skill after.