Evidence-based Unreal Engine 5.8 benchmark for complete AI game-building systems using Epic Unreal MCP, playable tasks, packaging, and launch proof.
Skill Claude CodeCodex
Use this skill to perform actions inside an Unreal Engine project via a live-editor MCP connection. Trigger when the user wants to change, query, or run something in their Unreal Engine project, not for conceptual or docs questions. Concrete triggers: spawn/move/duplicate/transform actors in a level, open a .uproject…
Skill Claude CodeCodex
Use when Unreal Engine NPCs need spawning, possession, perception, navigation, patrol, pursuit, attack decisions, Behavior Trees, StateTree, EQS, failure recovery, or proof of a closed AI gameplay loop.
Skill Claude CodeCodex
Use when an Unreal Engine character needs an Animation Blueprint, locomotion state machine, blend space, montage, slot, notify, root motion, retargeting, hit reaction, death animation, or animation/runtime synchronization repair.
Skill Claude CodeCodex
Use when Unreal assets must be searched, reused, imported, moved, renamed, saved, dependency-checked, or evaluated for runtime and licensing suitability.
Skill Claude CodeCodex
Use when an Unreal Engine feature needs a deliberate Blueprint, C++, or hybrid implementation route, especially for reusable state owners, graph changes, modules, components, compile failures, or editor-visible APIs.
Skill Claude CodeCodex
Use when an Unreal Engine game needs weapons, attacks, traces, projectiles, damage, health, hit reactions, death, scoring, cooldowns, targeting, combat reset, or recovery from invalid combat events.
Skill Claude CodeCodex
Use when building, completing, or repairing a playable Unreal Engine game or vertical slice that spans several gameplay, world, presentation, testing, and delivery domains.
Skill Claude CodeCodex
Use when defining or repairing Unreal Engine GameMode, GameState, PlayerState, Controller, Pawn, Character, subsystem, component, or replicated gameplay ownership and lifecycle boundaries.
Skill Claude CodeCodex
Use when an Unreal Engine map needs blockout, player-scale metrics, a critical path, encounters, traversal, collision, navigation, landmarks, spawn safety, readability, or spatial playtest repair.
Skill Claude CodeCodex
Use when an Unreal Engine scene needs materials, instances, landscape or mesh shading, decals, lighting, exposure, fog, reflections, post-process, visual hierarchy, or repair of unreadable and overly expensive rendering.
Skill Claude CodeCodex
Use when an Unreal Engine game needs interactable objects, objective progression, collection, triggers, win/fail states, prompts, scoring, reset, or recovery from invalid and repeated interactions.
Skill Claude CodeCodex
Use when an Unreal Engine project has low frame rate, hitches, stalls, memory growth, long loads, excessive draw calls, shader or overdraw cost, expensive AI or Blueprint work, or needs an evidence-based performance budget.
Skill Claude CodeCodex
Use when an Unreal Engine player cannot reliably spawn, possess, move, look, jump, aim, interact, switch input modes, or recover control after restart, or when Enhanced Input and camera ownership must be established.
Skill Claude CodeCodex
Use when Unreal Engine work must be compiled, exercised in PIE, saved and reopened, packaged, launched, smoke-tested, or triaged from logs before a completion or delivery claim.
Skill Claude CodeCodex
Use when beginning or resuming Unreal Engine work and the active project, maps, framework, plugins, content, compile state, logs, or available MCP capabilities are not yet established.
Skill Claude CodeCodex
Use when an Unreal Engine world needs Landscape terrain, water, foliage, biome masks, splines, procedural placement, PCG graphs, deterministic seeds, or terrain-related collision and performance repair.
Skill Claude CodeCodex
Use when an Unreal Engine game needs UMG HUD, menus, prompts, crosshairs, objective or health display, input-mode changes, viewport lifecycle, responsive layout, or repair of stale and duplicated widgets.
Skill Claude CodeCodex
Use when an Unreal Engine game needs Niagara, particles, impact effects, trails, ambience, Sound Cues, MetaSounds, spatial audio, music, UI sounds, or a coordinated feedback pass for gameplay events.
Skill Claude CodeCodex
Use when an Unreal Engine level needs settlements, roads, districts, streaming, World Partition, data layers, weather, time of day, large-scale dressing, landmarks, or a cohesive world pass beyond blockout and terrain.
At most 3 mods per repository are shown here, and a mod shipped inside a plugin is left to that plugin's page — the rest are on their repository pages: