What problem does it solve? Approved specs often stall because nobody defines the execution order, test discipline, or recovery points, so later sessions lose context and integration errors surface late. This Skill turns an approved spec into a concrete, on-disk plan that any session or agent can resume. ## Core Features & Use Cases - Vertical slice planning: Splits work into end-to-end slices (UI to persistence) with an explicit MVP-cut first, instead of horizontal phases that hide integration errors. - Per-step TDD mode and verification gates: Every implementation step declares strict, souple, or exploratory TDD mode plus an observable gate that must pass before the next step. - Resume point and execution handoff: Standalone plans carry a resume point for later sessions; multi-ticket programs get a dependency table handed off to tracker tooling. - Use Case: After brainstorm approves a checkout spec, invoke this Skill to produce docs/plans/2024-05-01-checkout-plan.md with eight gated steps, review checkpoints, and a resume point, then hand it to implementation. ## Quick Start Ask the agent to plan the approved spec at docs/specs/2024-05-01-checkout.md into vertical slices with TDD modes and verification gates.
