From Vibe Coding to Spec-Driven Development

# From Vibe Coding to Spec-Driven Development A developer used AI agents to build a complete fitness app in just 4.5 hours by giving the AI detailed specifications instead of vague instructions, which dramatically sped up the development process. This approach—moving away from casual "vibes" and toward precise requirements—shows how AI tools work best when you're clear about what you want rather than hoping the AI will figure it out. For businesses, this suggests that AI development moves faster when you invest time upfront in planning exactly what you need.