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The 5d-plan skill is a core component of the 5D Spec-Driven Development (SDD) methodology, designed to transition projects from the exploration phase to formal commitment. It generates a comprehensive PLAN.md document that forces developers to articulate problem statements, identify technical bets, and evaluate risks across four distinct quadrants. By requiring a declaration of thinking depth and the documentation of rejected alternatives, this skill ensures that software intent is fully understood and aligned before technical specifications or implementation begins.