router

# Master Router — Game-Development Skill Dispatcher

The entry point for game-development work. It fingerprints the project to pick **one** engine,
classifies the task from the request, names the **minimal** set of specialized skills, and tells
you to read them before acting. It **dispatches and composes** — it does not re-teach engine APIs.

## When to use

- Use at the **start of any game-development request** — building or debugging a game, level,
  player, enemy, shader, UI, save system, multiplayer, input, audio, AI, dialogue, procedural
  content, or visual asset set — to decide which skill(s) to load.
- Use when the user names an engine or genre, says "make a game", or asks "which skill should I
  use?".

**When *not* to use:** once the right skill is loaded and the task is squarely inside it, work
from that skill — don't re-run the router every turn. Re-route only when the task **pivots** to a
new engine or concern (router step 6).

## Routing algorithm

1. **Detect engine and version** — project fingerprint → at most one engine skill set (or
   "unknown"), then read the project's version source. §1.
2. **Classify task** — phrasing → discipline(s) + at most one genre + workflow(s). §2.
3. **Resolve** — the minimal set: engine skill(s) + discipline(s) + genre + workflow(s). §3.
4. **Read (disclosure)** — open only the chosen `SKILL.md` bodies; `references/` only on demand. §4.
5. **Compose** — order: engine fundamentals → discipline concept → genre glue → workflow. §5.
6. **Fallback** — engine unknown or no skill fits → ask or default to Godot; state any gap. §6.

---

## 1. Engine detection (project fingerprint)

Scan for the highest-confidence signal; **choose exactly one** engine. Stop at the first match.

| # | Engine | Primary signal | Skill set root |
|:-:|--------|----------------|----------------|
| 1 | Godot | `project.godot` | `skills/godot/` |
| 2 | Unreal | `*.uproject` | `skills/unreal/` |
| 3 | Unity | `Assets/` **and** `ProjectSettings/ProjectVersion.txt` | `skills/unity/` |
| 4 | Bevy | `Cargo.toml` with a `bevy` dependency | `skills/other-engines/bevy-ecs/` |
| 5 | Phaser | `package.json` dep `phaser` | `skills/web-engines/phaser-*` |
| 6 | PixiJS | `package.json` dep `pixi.js` | `skills/web-engines/pixijs-rendering/` |
| 7 | three.js | `package.json` dep `three` | `skills/web-engines/threejs-*` |
| 8 | LÖVE | `conf.lua` / `main.lua` calling `love.*` | `skills/other-engines/love2d-core/` |
| 9 | pygame | `*.py` with `import pygame` | `skills/other-engines/pygame-core/` |
| 10 | Roblox | `*.rbxl(x)` / `*.project.json` (Rojo) | `skills/other-engines/roblox-*` |

For secondary signals, the Godot-C#/Unity/Bevy and multi-web disambiguation rules, monorepos,
and plain-text engine mentions, read `references/engine-detection.md`.

After identifying the engine, read its version from project metadata or dependency locks before
choosing APIs. Existing projects keep their pinned version unless migration is requested; the
catalog baseline is only for new projects. The exact version sources are in the detection reference
and `../docs/VERSION-SUPPORT.md`.

## 2. Task classification (phrasing → category)

After the engine, read the request for task signals (three **additive** categories):

- **disciplines** (cross-engine concepts): `create-game-assets`, `game-ai`, `ai-behavior-trees-utility-ai`, `procedural-gen`, `dialogue-systems`,
  `save-systems`, `audio-design`, `shader-programming`, `physics-tuning`, `level-design`,
  `input-systems`, `game-feel`, `camera-systems`, `game-ui-ux`, `performance-optimization`.
  Triggered by concept words ("sprite sheet", "art direction", "texture", "pathfinding",
  "save slots", "fragment shader", "screen shake", "camera follow", "HUD/menu",
  "optimize/low FPS").
- **genres** (whole-game templates): `platformer`, `roguelike`, `rpg`, `fps-shooter`,
  `tower-defense`, `card-game`, `visual-novel`, `survival-crafting`, `puzzle`. Triggered by genre
  words ("make a roguelike", "deckbuilder").
- **workflows** (process/shipping): `game-jam`, `prototype-fast`, `steam-publish`,
  `itch-publish`. Triggered by process words ("publish on Steam", "vertical slice").

File signals sharpen this: `*.yarn`/`*.ink` → `dialogue-systems`/`visual-novel`; `steam_appid.txt`
→ `steam-publish`; `*.inputactions` → `unity-input-system`.

## 3. Routing table (task → category → skill)

### 3a. Engine skills — read the one matching the detected engine + sub-task

- **Godot** (`skills/godot/`): language `godot-gdscript` / `godot-csharp`; structure
  `godot-nodes-scenes`, `godot-signals-groups`; 2D `godot-2d-movement`, `godot-tilemap`; 3D
  `godot-3d-essentials`; physics `godot-physics`; UI `godot-ui-control`; animation
  `godot-animation`; shaders `godot-shaders`; data `godot-resources`; audio `godot-audio`;
  netcode `godot-multiplayer`; ship `godot-export`.
- **Unity** (`skills/unity/`): scripting `unity-csharp-scripting`; input `unity-input-system`;
  physics `unity-physics`; animation `unity-animation`; data `unity-scriptableobjects`; 2D
  `unity-tilemap-2d`; AI nav `unity-navmesh`; ship `unity-build-pipeline`.
- **Unreal** (`skills/unreal/`): visual scripting `unreal-blueprints`; C++ gameplay
  `unreal-cpp-gameplay`; input `unreal-enhanced-input`; AI `unreal-behavior-trees`; VFX
  `unreal-niagara`; ship `unreal-packaging`.
- **Web** (`skills/web-engines/`): `phaser-core`, `phaser-arcade-physics`; `pixijs-rendering`;
  `threejs-scene-setup`, `threejs-gltf-loading`, `threejs-materials-lighting`.
- **Other** (`skills/other-engines/`): `bevy-ecs`, `pygame-core`, `love2d-core`, `roblox-luau`,
  `roblox-datastores`.

### 3b. Disciplines — load **with** the engine skill (concept ↔ engine API)

| Concept (`says:`) | Discipline skill | Pairs with (engine API) |
|-------------------|------------------|-------------------------|
| art direction, game assets, sprites, tilesets, textures, icons, 3D props | `create-game-assets` | engine importer/rendering skill; `imagegen` when avai