What problem does it solve? Non-trivial code changes often start without a grounded plan, leading to scope creep, rebuilt existing solutions, and wrong approaches discovered only after code is written. This Skill structures the planning phase so weak plans are caught and revised before implementation begins. ## Core Features & Use Cases - Seven-step planning workflow: problem statement, scope check with a halt rule, existing-solutions search, minimal path design, adversarial critique, decomposition, and durable plan output. - Five-axis critique rubric: scores plans on assumption audit, scope creep, existing solutions, minimalism, and uncertainty, issuing PROCEED, REVISE, or BLOCKED verdicts with evidence-based justifications. - Tracer-bullet vertical slicing: breaks PRDs into end-to-end slices cutting through schema, API, UI, and tests, with an expand-migrate-contract pattern for wide refactors. - Use Case: Given a PRD for a new feature, produce a phased plan where each phase is an independently shippable vertical slice, critiqued against the rubric before any code is written. ## Quick Start Ask the agent to plan a non-trivial change before writing code, for example: plan the implementation of this PRD using the planning workflow and critique the plan before we start.
