Structured Planning Verification-driven task decomposition with Sibyl-native tracking. Mined from 200+ real planning sessions: the plans that actually survived contact with code. Core insight: Plans fail when steps can't be verified. Decomposition that lands in concrete checks survives contact with reality; abstract bullets don't. Tracking in Sibyl lets plans outlive the context window that produced them. How to read this skill: the phases below describe the rhythm of a useful planning pass, not a procedure to march through. Skip planning entirely for small clear work, compress phases when th…