ue-state-trees

Guide Unreal Engine State Tree implementation for data-driven state machines.

304|46|Updated Mar 1, 2026

Search Tags:#ai #fsm #unreal engine #game logic #mass entity #state tree

Ready to run

npx skills add https://github.com/quodsoler/unreal-engine-skills --skill ue-state-trees

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: ue-state-trees
Source: https://github.com/quodsoler/unreal-engine-skills/tree/main/skills/ue-state-trees
Command: npx skills add https://github.com/quodsoler/unreal-engine-skills --skill ue-state-trees

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill provides expert guidance on implementing Unreal Engine's State Tree system, enabling the creation of complex, data-driven state machines for AI behaviors, game logic, and entity processing.

Core Features & Use Cases

State Tree Architecture: Understand the core components like UStateTree, tasks, conditions, and evaluators.
Mass Entity Integration: Learn how to leverage State Trees for high-performance processing of thousands of entities.
Use Case: Develop an AI enemy's combat logic using State Trees, defining states for "Patrolling," "Chasing," "Attacking," and "Fleeing," with transitions triggered by player proximity and combat events.

Quick Start

Use the ue-state-trees skill to create a new State Tree task for checking actor health.

Frequently Asked Questions about ue-state-trees

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I use State Trees in Unreal Engine for AI behavior logic?▼

State Trees in Unreal Engine let you build data-driven state machines for AI behaviors by combining tasks, conditions, and evaluators. You define states like Patrolling or Attacking, then trigger transitions based on game events and player proximity.

Does the State Tree system work with Mass Entity for processing thousands of actors?▼

Yes, the State Tree system integrates directly with Mass Entity to enable high-performance processing. This integration allows you to leverage data-driven state machines for efficiently executing complex game logic across thousands of entities.

What are the core components of a data-driven state machine in UE5?▼

The core components of a UE5 data-driven state machine include the UStateTree asset, tasks for executing logic, conditions for evaluating state validity, and evaluators for calculating and providing data to the State Tree.

How do I create a custom State Tree task to check actor health?▼

To create a custom State Tree task for checking actor health, you implement a new task within the State Tree schema. This task evaluates the actor's health property and outputs the result to drive subsequent state transitions.

When should I use State Trees instead of traditional Finite State Machines?▼

You should use State Trees instead of traditional Finite State Machines when you need data-driven, hierarchical state execution. State Trees provide better performance and modularity, especially when integrating complex game logic with Mass Entity systems.

Can I define complex combat logic transitions using Unreal Engine State Trees?▼

Yes, you can define complex combat logic transitions using Unreal Engine State Trees. You configure transitions between states like Chasing, Attacking, and Fleeing by linking them to specific conditions and combat events within the schema.