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Spec-Driven Development in the Real World

Published

Oct 9, 2025

The industry is converging on spec-driven development as the professional way to build with AI, but most tools are missing 3 critical aspects that make it actually work in the real world. I'll show you what's missing from most tools, plus how I solve these gaps with Agent OS to create specs that turn ideas into shipping products consistently.

Builder Methods

Training and community for developers and founders building with AI.

Created by Brian Casel (that's me) — multi-time founder, product designer, teacher, and the creator behind Builder Methods.

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