What problem does it solve? Turning a feature specification into a concrete implementation plan requires resolving technical unknowns, modeling data, and defining contracts, which is slow and inconsistent when done manually. This Skill automates that planning workflow inside a spec-kit project. ## Core Features & Use Cases - Plan Workflow Execution: Runs the setup script, loads the feature spec and project constitution, and fills the implementation plan template with technical context and constitution checks. - Research and Design Artifacts: Generates research.md to resolve open questions, then produces data-model.md, contracts/, and quickstart.md during Phase 0 and Phase 1. - Extension Hook Support: Executes optional and mandatory before_plan and after_plan hooks defined in .specify/extensions.yml. - Use Case: After writing a feature spec in a spec-kit repository, invoke this Skill to produce a complete plan with resolved clarifications, a data model, interface contracts, and a validation quickstart guide. ## Quick Start Run the speckit-plan skill with your feature details to generate the implementation plan and design artifacts for the current spec-kit branch.