What problem does it solve? Writing a complete, consistent game design document (GDD) for a single game system is hard: sections get skipped, formulas lack defined variables, and cross-system dependencies contradict each other. This Skill walks you through every required GDD section collaboratively, gathering context from existing design docs first and writing approved content incrementally to file. ## Core Features & Use Cases - Guided Section Cycle: Walks through Overview, Player Fantasy, Detailed Design, Formulas, Edge Cases, Dependencies, Tuning Knobs, and Acceptance Criteria with a draft-approve-write loop for each section. - Context-Aware Authoring: Reads the game concept, systems index, entity registry, and dependency GDDs before designing, surfacing locked cross-system facts and past consistency failures. - Retrofit Mode: Fills only missing or placeholder sections in an existing GDD file without overwriting completed content. - Specialist Delegation: Consults creative-director, systems-designer, economy-designer, qa-lead, and art-director subagents for high-risk sections, with full/lean/solo review modes. - Use Case: Run it to design a combat system: it reads your systems index, checks engine feasibility constraints, drafts formulas with variable tables, and writes testable Given-When-Then acceptance criteria to design/gdd/combat.md. ## Quick Start Ask the AI to design the movement system GDD using the design-system skill and approve each drafted section as it is written to file.
