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.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# 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
- **New Features:** Implementing non-trivial functionality.
- **System Design:** Defining architecture, data flows, or API contracts.
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The line at the top of this page pins the label git:20260907.70ddb5c, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
GET https://markdownregistry.com/api/v1/artifacts/art_a7hjkaviykr75xpe
GET https://markdownregistry.com/api/v1/resolve?ref=vodailocz/kilo-kit-mcp/spec-driven-development
GET https://markdownregistry.com/api/v1/blob/29470dc30ee20e75728944d40efb63355969f5317217b927fef2e3c0da033306
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nota-america/forgecat-agent-profiles · profiles/addyosmani/agent-skills/for-codex/.agents/skills/spec-driven-development/SKILL.md · Creates specs before coding. Use when starting a new project, feature, or significant change and no specification…
