What problem does it solve? Turning a written feature specification into an actionable technical plan is slow and inconsistent: diagrams get skipped, requirements lose traceability, and testing strategy is an afterthought. This Skill reads a feature's spec.md and produces a complete plan.md with diagrams, file-by-file steps, and a resolved testing strategy. ## Core Features & Use Cases - Diagram generation: Creates Mermaid sequence, state, and ER diagrams based on API interactions, stateful entities, and new database tables detected in the spec. - File-by-file implementation plan: Maps every functional requirement to concrete files across infrastructure, database, business logic, API, UI, and test layers, with FR sub-task numbering for traceability. - Constitution and scope checks: Validates the plan against project architectural principles and classifies feature size (S/M/L) to budget diagram output. - Use Case: After writing a spec for a notifications feature, run the plan step to get 7 implementation steps across 9 files, an ER diagram for two new tables, an OpenAPI contract, and a resolved test command table. ## Quick Start Ask the AI to run /spec-plan for your feature name to generate plan.md with diagrams and an implementation strategy from the existing spec.
