Fission-AI/OpenSpec: Spec-Driven Development for AI Coding Assistants Reaches 34.8K Stars

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OpenSpec introduces spec-driven development (SDD) — a methodology where AI coding assistants align on requirements before writing code through structured proposals, specifications, and design docs. Works with 20+ AI tools via slash commands, supports iterative non-waterfall workflows, and provides dashboard tracking. At 34.8K stars with v1.2.0 (February 2026), it represents the formalization of the 'think before you code' pattern for AI-assisted development.