brainstorm-game-designlisted

# Brainstorm: Game Design — decide what the game IS, then never lose it This is a design-facilitation mode, not a code mode. Its job is to turn a vague idea ("a shooter, but cool") into a **committed design with pillars and constraints** — and to write that design into the game project so the next session, in any agent, builds the *same* game instead of a new one. **Two failures this mode prevents:** (1) generic design — the game that's a list of features from every other game in its genre; (2) design amnesia — decisions made in chat that vanish, so the next session contradicts them. Both are solved the same way: force real choices, then persist them. ## The persistence contract (non-negotiable — read [../browser-engine/references/design-memory.md](../browser-engine/references/design-memory.md)) Chat proposes; **`game-design/GDD.md` records.** The moment a decision is accepted it is written to the GDD, logged in `decisions.md`, and the summary in `AGENTS.md` is kept in sync so every agent reloads it. A brilliant brainstorm that stays in the transcript is a failure. Scaffold the memory first: [tools/scaffold-design-memory.mjs](tools/scaffold-design-memory.mjs). ## BANNED (generic-design tells — never ship a GDD with these unexamined) - **Genre-by-checklist** — "platformer with double jump, dash, wall-jump, collectibles, boss." That's the genre's feature list, not a design. What's the ONE thing this game does that its genre doesn't? - **No pillars** — a design with no 2–4 p