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spec-driven-development

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Use when starting a new feature, product, or system design. Eliminates the spec-implementation gap by making specifications the primary artifact that drives code generation. Keywords: SDD, spec-driven, PRD, feature spec, user stories, implementation plan, specification, acceptance criteria, Given-When-Then.

skills/productivity/spec-driven-development/SKILL.md

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# Spec-Driven Development (SDD)

SDD is the professional standard for high-assurance, agentic software engineering in 2026. It reverses the traditional "code-first" approach, elevating specifications to the primary system artifact. By ensuring code is merely a verified expression of precise specs, we eliminate ambiguity, technical debt, and misaligned requirements.

## Why SDD in 2026?

As AI agents become the primary contributors to codebases, the bottleneck has shifted from *writing code* to *defining intent*. SDD provides:
- **Alignment:** Ensures AI agents work on the exact problem identified by the human.
- **Traceability:** Every line of code can be traced back to an acceptance criterion in a spec.
- **Verification:** Specs serve as the "ground truth" for automated test suites and agent-based verification.
- **Efficiency:** Reduces the need for costly refactoring by catching logic errors at the specification phase rather than the production phase.

## When to Use
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