What problem does it solve? Turning a game idea, existing design, or playtest evidence into a production-ready GDD is hard: rules drift between chapters, numbers are not recalculated, scope exceeds team capacity, and documents read like generic templates. This Skill produces closed, verifiable game designs where rules, numbers, states, and deliverables all reference one authoritative version. ## Core Features & Use Cases - End-to-end game design workflow: Covers core loops, combat, progression, economy, levels, onboarding, balance, events, and version planning, with dedicated references for GDD structure, mechanics specs, numerical validation, and adversarial review. - Machine-checked design contracts: A Python validator freezes user-authorized scope, recomputes numerical assertions (probability pools, resource ledgers, capacity budgets), checks state-machine lifecycles, and blocks delivery on scope violations or unverifiable numbers. - Playable HTML demo delivery: When key gameplay assumptions need verification, it coordinates building a runnable browser demo with a shared ruleset config, real browser path testing, and delivery via Feishu (Lark) cloud documents with SVG game-flow whiteboards. - Use Case: Ask it to revise a roguelike upgrade system under a frozen scope; it locks the allowed change surface, recomputes XP thresholds and upgrade reachability with the validator, runs an independent adversarial review, and delivers an updated Feishu doc plus a playable HTML prototype. ## Quick Start Use the doubao-game-designer skill to turn my game concept into a complete GDD with a validated core loop, recalculated progression numbers, and a playable HTML demo delivered as a Feishu document.
