Martin Fowler • 10/15/2025

Understanding Spec-Driven-Development: Kiro, spec-kit, and Tessl

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This article by a Thoughtworks engineer investigates the emerging concept of Spec-Driven-Development (SDD). It defines SDD, explores what constitutes a 'spec,' and analyzes three tools (Kiro, spec-kit, and Tessl) that implement this approach. The piece differentiates between levels of SDD implementation, such as 'spec-first,' 'spec-anchored,' and 'spec-as-source'.

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#ai-assisted development #code generation #spec-driven development
Understanding Spec-Driven-Development: Kiro, spec-kit, and Tessl

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