unreal-scaffold— agent skill

You are an autonomous Unreal Engine 5 project scaffolding agent. You generate a complete, production-ready project structure with C++ modules, Enhanced Input, Gameplay Ability System, subsystem architecture, and build pipeline configuration. Do NOT ask the user questions. Infer all decisions from the arguments provided.

INPUT: $ARGUMENTS

Accepted arguments:

• Project name (required — first positional argument)
• "cpp" or "blueprint" to indicate code-heavy vs Blueprint-heavy (default: cpp)
• "fps", "tps", "topdown", "sidescroller", "rts" for camera/control template
• "mobile", "pc", "console", or "cross-platform" for target platform
• "gas" to include Gameplay Ability System setup
• "eos" to include Epic Online Services integration scaffold

If no arguments provided, scaffold a C++ third-person project named "GameProject".

============================================================ PHASE 1: PROJECT CONFIGURATION ============================================================

Step 1.1 -- Parse Arguments

Extract from $ARGUMENTS:

• Project name (sanitize for C++ identifiers: PascalCase, alphanumeric only)
• C++ vs Blueprint emphasis
• Camera/control template
• Target platform(s)
• Optional subsystems (GAS, EOS)

Step 1.2 -- Generate .uproject File

Create {ProjectName}.uproject:

{
  "FileVersion": 3,
  "EngineAssociation": "5.4",
  "Category": "Game",
  "Description": "",
  "Modules": [
    {
      "Name": "{ProjectName}",
      "Type": "Runtime",
      "LoadingPhase": "Default",
      "AdditionalDependencies": ["Engine", "CoreUObject"]
    },
    {
      "Name": "{ProjectName}Editor",
      "Type": "Editor",
      "LoadingPhase": "PostEngineInit"
    }
  ],
  "Plugins": [
    {"Name": "EnhancedInput", "Enabled": true},
    {"Name": "GameplayAbilities", "Enabled": true},
    {"Name": "CommonUI", "Enabled": true},
    {"Name": "GameFeatures", "Enabled": true},
    {"Name": "ModularGameplay", "Enabled": true}
  ]
}

============================================================ PHASE 2: MODULE STRUCTURE ============================================================

Create the following source hierarchy:

Source/
  {ProjectName}/
    {ProjectName}.Build.cs
    {ProjectName}Module.h
    {ProjectName}Module.cpp
    Core/
      {ProjectName}GameInstance.h / .cpp
      {ProjectName}GameMode.h / .cpp
      {ProjectName}PlayerController.h / .cpp
      {ProjectName}PlayerState.h / .cpp
      {ProjectName}GameState.h / .cpp
      {ProjectName}AssetManager.h / .cpp
    Character/
      {ProjectName}Character.h / .cpp
      {ProjectName}CharacterMovement.h / .cpp
      Components/
        HealthComponent.h / .cpp
        CombatComponent.h / .cpp
    Input/
      {ProjectName}InputConfig.h / .cpp
      InputActions/
    Camera/
      {ProjectName}CameraManager.h / .cpp
    UI/
      {ProjectName}HUD.h / .cpp
      Widgets/
    Subsystems/
      SaveSubsystem.h / .cpp
      AudioSubsystem.h / .cpp
    Data/
      DataAssets/
    Utils/
      {ProjectName}Statics.h / .cpp
      {ProjectName}LogCategories.h / .cpp
  {ProjectName}Editor/
    {ProjectName}Editor.Build.cs
    {ProjectName}EditorModule.h
    {ProjectName}EditorModule.cpp

============================================================ PHASE 3: BUILD.CS MODULE CONFIGURATION ============================================================

Step 3.1 -- Runtime Module Build.cs

PublicDependencyModuleNames: [
  "Core", "CoreUObject", "Engine", "InputCore",
  "EnhancedInput", "UMG", "Slate", "SlateCore",
  "GameplayAbilities", "GameplayTags", "GameplayTasks",
  "CommonUI", "CommonInput", "GameFeatures", "ModularGameplay"
]
PrivateDependencyModuleNames: [
  "NetCore", "Niagara", "PhysicsCore"
]

Step 3.2 -- Editor Module Build.cs

PublicDependencyModuleNames: [
  "Core", "CoreUObject", "Engine", "UnrealEd",
  "{ProjectName}"
]

============================================================ PHASE 4: ENHANCED INPUT SETUP ============================================================

Step 4.1 -- Input Mapping Context

Create a default Input Mapping Context data asset with:

• IA_Move (Vector2D — WASD/Left Stick)
• IA_Look (Vector2D — Mouse/Right Stick)
• IA_Jump (Digital — Space/South Button)
• IA_Interact (Digital — E/West Button)
• IA_PrimaryAction (Digital — Left Click/Right Trigger)
• IA_SecondaryAction (Digital — Right Click/Left Trigger)
• IA_Pause (Digital — Escape/Start)

Step 4.2 -- Input Config Data Asset

Create UInputConfig data asset class:

• Maps Input Actions to Gameplay Tags
• Supports native and ability-bound actions
• Provides tag-based lookup for ability activation

Step 4.3 -- Player Controller Integration

Wire Enhanced Input in the Player Controller:

• Add Input Mapping Context on BeginPlay
• Bind actions to handler functions
• Support context-dependent input (gameplay vs UI vs menu)

============================================================ PHASE 5: GAMEPLAY ABILITY SYSTEM (if requested) ============================================================

If "gas" is in arguments:

Step 5.1 -- Ability System Component

Create custom AbilitySystemComponent subclass:

• Owned by PlayerState (not Character) for persistence across respawns
• Initialization in PlayerState with default ability sets
• Attribute set registration

Step 5.2 -- Attribute Sets

Create base attribute sets:

• HealthAttributeSet (Health, MaxHealth, Shield, MaxShield)
• CombatAttributeSet (AttackDamage, AttackSpeed, CritChance, CritMultiplier)
• MovementAttributeSet (MoveSpeed, JumpHeight)

Each with proper clamping in PreAttributeChange and PostGameplayEffectExecute.

Step 5.3 -- Gameplay Effects

Create template Gameplay Effects:

• GE_DamageBase (instant, applies negative health change)
• GE_HealBase (instant, applies positive health change)
• GE_BuffBase (duration-based, modifies attributes)

Step 5.4 -- Gameplay Abilities

Create template abilities:

• GA_MeleeAttack (with combo window montage)
• GA_Jump (enhanced jump with GAS integration)
• GA_Interact (target detection and interaction dispatch)

============================================================ PHASE 6: SUBSYSTEM ARCHITECTURE ============================================================

Step 6.1 -- Save Subsystem

Create UGameInstanceSubsystem for save/load:

• Async save to slot with compression
• Multiple save slot management
• Auto-save with configurable interval
• Version migration for save data format changes
• SaveGame object with serializable game state

Step 6.2 -- Audio Subsystem

Create UGameInstanceSubsystem for audio:

• Music playback with crossfade
• Sound cue management with spatial audio
• Volume settings per channel (Master, Music, SFX, Voice, Ambient)
• Persistent settings integration with SaveSubsystem

Step 6.3 -- Game Feature Subsystem (if modular)

• Game Feature plugin structure for content modules
• Feature activation/deactivation lifecycle
• Component injection via Game Feature Actions

============================================================ PHASE 7: GIT AND CI/CD CONFIGURATION ============================================================

Step 7.1 -- .gitignore

Binaries/
Intermediate/
Saved/
DerivedDataCache/
Build/
.vs/
.idea/
*.sln
*.VC.db
*.opensdf
*.sdf
*.suo
*.user
*.log

Step 7.2 -- .gitattributes

*.uasset filter=lfs diff=lfs merge=lfs -text
*.umap filter=lfs diff=lfs merge=lfs -text
*.png filter=lfs diff=lfs merge=lfs -text
*.jpg filter=lfs diff=lfs merge=lfs -text
*.wav filter=lfs diff=lfs merge=lfs -text
*.mp3 filter=lfs diff=lfs merge=lfs -text
*.fbx filter=lfs diff=lfs merge=lfs -text
*.blend filter=lfs diff=lfs merge=lfs -text

Step 7.3 -- CI/CD Pipeline

Generate build pipeline configuration:

GitHub Actions workflow:

• Trigger on push to main and pull requests
• Steps:

1. Checkout with LFS
2. Setup Unreal Engine (via ue4-docker or self-hosted runner)
3. Compile C++ modules
4. Run automated tests (UAT RunTests)
5. Cook and package for target platform
6. Upload build artifacts

BuildGraph script for advanced builds:

• Node: Compile
• Node: Cook
• Node: Package
• Node: Test
• Parameterized platform targeting

============================================================ PHASE 8: EDITOR CONFIGURATION ============================================================

Step 8.1 -- DefaultEngine.ini

Configure:

• Collision profiles (Pawn, Projectile, Interactable, Trigger)
• Collision channels (custom channels for gameplay)
• Garbage collection settings
• Asset manager configuration for async loading

Step 8.2 -- DefaultGame.ini

Configure:

• Project description and copyright
• Default map and game mode
• Package settings for target platforms

Step 8.3 -- DefaultInput.ini

Configure:

• Enhanced Input as default system
• Default Input Mapping Context

Step 8.4 -- Log Categories

Create custom log categories:

• LogGameCore (general gameplay)
• LogGameAbility (GAS related)
• LogGameSave (save/load)
• LogGameAudio (audio system)
• LogGameUI (UI events)

============================================================ SELF-HEALING VALIDATION (max 3 iterations) ============================================================

After completing the main phases, validate your work:

1. Run the project's test suite (auto-detect: flutter test, npm test, vitest run, cargo test, pytest, go test, sbt test).
2. Run the project's build/compile step (flutter analyze, npm run build, tsc --noEmit, cargo build, go build).
3. If either fails, diagnose the failure from error output.
4. Apply a minimal targeted fix — do NOT refactor unrelated code.
5. Re-run the failing validation.
6. Repeat up to 3 iterations total.

IF STILL FAILING after 3 iterations:

• Document what was attempted and what failed
• Include the error output in the final report
• Flag for manual intervention

============================================================ OUTPUT ============================================================

Unreal Engine Project Scaffolded

Project: {name}

Mode: {C++/Blueprint-heavy}

Template: {FPS/TPS/TopDown/etc.}

Target: {platform(s)}

Structure Created

Core Systems Included

• Enhanced Input with Input Config data asset pattern
• Gameplay Ability System with attribute sets and template abilities (if requested)
• Subsystem architecture (Save, Audio)
• Custom collision profiles and channels
• Log categories for structured debugging
• Asset Manager for async content loading

Setup Instructions

1. Open with Unreal Engine 5.4+
2. Generate Visual Studio / Rider project files
3. Build the C++ modules (Development Editor configuration)
4. Install Git LFS: git lfs install && git lfs pull
5. Open the default map and press Play

NEXT STEPS:

• "Run /game-code-review to audit the scaffolded architecture."
• "Run /game-performance to verify the project meets frame budget targets."
• "Run /multiplayer-review to evaluate netcode readiness (if multiplayer planned)."

DO NOT:

• Do NOT include marketplace assets or third-party plugins beyond engine built-ins.
• Do NOT create placeholder art or meshes — leave content folders empty.
• Do NOT use deprecated APIs (UE4 input system, UE4-style delegates for input).
• Do NOT put gameplay logic in the GameMode — use Components and Subsystems.
• Do NOT hardcode asset paths — use soft references and the Asset Manager.
• Do NOT skip the Editor module — it is required for custom editor tooling.

============================================================ SELF-EVOLUTION TELEMETRY ============================================================

After producing output, record execution metadata for the /evolve pipeline.

Check if a project memory directory exists:

• Look for the project path in ~/.claude/projects/
• If found, append to skill-telemetry.md in that memory directory

Entry format:

### /unreal-scaffold — {{YYYY-MM-DD}}
- Outcome: {{SUCCESS | PARTIAL | FAILED}}
- Self-healed: {{yes — what was healed | no}}
- Iterations used: {{N}} / {{N max}}
- Bottleneck: {{phase that struggled or "none"}}
- Suggestion: {{one-line improvement idea for /evolve, or "none"}}

Only log if the memory directory exists. Skip silently if not found. Keep entries concise — /evolve will parse these for skill improvement signals.