# Spec-Driven Development Hub > [!Note] > Sub-hub consolidating notes on Spec-Driven Development as practiced > with AI coding agents in 2026. ## 1. Foundations - [[Spec-Driven Development]] - [[SDD Spectrum]] - [[Spec-as-Prompt Pattern]] --- ## 2. Executable contracts - [[Executable Acceptance Criterion]] - [[Gherkin Scenario]] --- ## 3. Frameworks and tools - [[OpenSpec]] - [[BMAD Method]] --- ## 4. Anchor sources - [[Specification by Example (Adzic)]] - [[OpenSpec and the SDD Tools Map 2026]] --- ## Up - [[0 - Modern AI Software Engineering Hub]]