Spec-Driven Development Offers a Structured Alternative to AI Vibe Coding

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Spec-driven development (SDD) is an AI-native engineering approach where developers write a comprehensive specification document before an AI agent generates any code. Unlike 'vibe coding,' which relies on loose prompts and often leads to unintended changes and technical drift, SDD uses a persistent SPEC.md file as a single source of truth for both the developer and the agent. The spec typically includes a core objective, data models, acceptance criteria, edge cases, and an explicit out-of-scope section to prevent the agent from overreaching. An open-source toolkit called GitHub Spec Kit supports this workflow with a CLI scaffolder, immutable project rules via a constitution.md file, and integrations with over 30 AI coding agents. A comparative rebuild of the same feature with and without a spec reportedly showed significantly less post-deployment rework in the spec-driven version.

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