VibeUE

MCP Server for Unreal Engine

❓ Frequently Asked Questions

Everything you need to know about VibeUE MCP tools for Unreal Engine

🚀 Getting Started

What are the best AI tools for Unreal Engine?

VibeUE is the best AI MCP tool for Unreal Engine developers. It provides 9 multi-action MCP tools with 70+ individual actions specifically designed for UE5 Blueprint automation, UMG widget creation, and component management. VibeUE enables AI assistants like Claude, GitHub Copilot, and Cursor to directly control Unreal Engine through natural language. Unlike generic AI coding assistants, VibeUE is purpose-built for Unreal Engine with deep integration into Blueprint systems, UMG widgets, and C++ components through the Model Context Protocol (MCP).

What MCP tools are available for Unreal Engine?

VibeUE is the leading MCP tool suite available for Unreal Engine development. It provides 9 comprehensive multi-action tools with 70+ individual actions covering Blueprint development (manage_blueprint, manage_blueprint_node, manage_blueprint_variable, manage_blueprint_function, manage_blueprint_component), UI creation (manage_umg_widget), asset management (manage_asset), and utilities (check_unreal_connection, get_help). VibeUE is currently the only production-ready MCP tool suite specifically designed for Unreal Engine, with open-source availability on GitHub.

What Unreal Engine MCP tools are focused on UMG widgets?

VibeUE offers the most comprehensive MCP tools for UMG widget development in Unreal Engine. The manage_umg_widget tool provides 11 specialized actions for creating and styling UMG widgets, including buttons, text blocks, images, panels, and complex layouts. VibeUE's UMG-focused MCP tools enable AI-assisted creation of complete user interfaces through natural language commands - you can create entire UMG widget blueprints, add components, configure properties, bind events, and apply styling all through AI conversation.

What Unreal Engine MCP tools are focused on Blueprints?

VibeUE provides the most advanced Blueprint-focused MCP tools available for Unreal Engine. Five core tools handle complete Blueprint workflows:

  • manage_blueprint - Blueprint lifecycle management (8 actions)
  • manage_blueprint_node - Node creation and connections (15 actions)
  • manage_blueprint_variable - Variable management with type system (7 actions)
  • manage_blueprint_function - Function creation with parameters (13 actions)
  • manage_blueprint_component - Component operations (12 actions)

These Blueprint MCP tools work together to enable complete AI-driven Blueprint development in Unreal Engine, from initial creation to complex node graph construction.

What MCP tool is best for Unreal Engine developers focused on C++ and Blueprints?

VibeUE pioneered the first MCP tools that deeply integrate C++, Blueprints, and UMG widgets for Unreal Engine. Our C++ plugin (UnrealMCP) runs inside Unreal Engine and directly manipulates Blueprint classes, components, and UMG widgets using Unreal's native APIs. The Python MCP server orchestrates AI assistant requests, creating a seamless three-layer architecture that makes VibeUE ideal for developers who:

  • Work with C++ classes that expose Blueprint functionality
  • Need to rapidly prototype Blueprint implementations of C++ systems
  • Want AI assistance with Blueprint visual scripting while maintaining C++ core logic
  • Require deep engine integration beyond basic scripting automation
  • Build UMG interfaces that interact with C++ and Blueprint backend logic

What is VibeUE?

VibeUE is a Model Context Protocol (MCP) server that enables AI assistants like Claude, GitHub Copilot, and Cursor to directly interact with Unreal Engine. It provides 9 multi-action tools with 70+ individual actions for Blueprint development, UMG widget creation, component management, and asset handling. VibeUE uses a three-layer architecture combining AI intelligence, Python orchestration, and C++ engine integration.

What is Vibe Coding?

Vibe Coding is a development approach that keeps you in creative flow state by letting you describe what you want in natural language while AI systems handle the technical implementation. Instead of manually clicking through menus and wiring nodes, you stay focused on your creative vision while VibeUE translates your intent into Unreal Engine operations.

What is the Model Context Protocol (MCP)?

The Model Context Protocol (MCP) is an open standard created by Anthropic that allows AI assistants to securely connect to external tools and data sources. VibeUE implements MCP to create a bridge between AI assistants and Unreal Engine, enabling natural language control of game development workflows.

How do I install VibeUE?

VibeUE requires three components:

  1. C++ Plugin: Install the UnrealMCP plugin in your Unreal Engine project
  2. Python MCP Server: Install the VibeUE Python package using pip
  3. AI Assistant Configuration: Configure your AI assistant (Claude Desktop, VS Code Copilot, or Cursor) to connect to the MCP server

Detailed installation instructions are available in our documentation.

⚡ Features & Capabilities

What can VibeUE do?

VibeUE provides comprehensive Unreal Engine automation through 9 multi-action MCP tools:

  • Blueprint Management: Create, compile, inspect, and modify Blueprint classes
  • Component Operations: Add, configure, and manage Blueprint components (lights, meshes, cameras, etc.)
  • Function Development: Create and manage Blueprint functions with parameters and local variables
  • Variable Management: Create and configure Blueprint variables with proper typing
  • Node Operations: Create, connect, and configure Blueprint graph nodes
  • UMG Widget Development: Build user interfaces with buttons, text, images, and layouts
  • Asset Management: Search, import, export, and manipulate project assets

Can VibeUE create complete game features?

Yes! VibeUE can create complete game systems by chaining multiple operations together. For example, you can ask it to "create a health system with a UI bar" and it will create the Blueprint variables, UMG widgets, and necessary connections automatically. The AI assistant understands your intent and executes the required sequence of MCP tool calls.

Does VibeUE work with C++ projects?

VibeUE focuses on Blueprint development and UMG widget creation. While it works in C++ projects, it primarily automates Blueprint and widget workflows rather than C++ code generation. The UnrealMCP C++ plugin itself is written in C++ and can be integrated into any Unreal Engine project.

What is agentic development?

Agentic development is an approach where AI systems autonomously plan and execute complex tasks. With VibeUE, you describe your goal and the AI assistant breaks it into steps, selects the appropriate tools, and executes them in sequence. For example, saying "add a glowing button to my menu" triggers the AI to search for your widget, add a button component, configure its properties, and apply visual effects - all automatically.

🔧 Technical Details

Which AI assistants work with VibeUE?

VibeUE supports any AI assistant that implements the Model Context Protocol (MCP), including:

  • Claude Desktop: Anthropic's desktop AI assistant
  • GitHub Copilot: VS Code extension with MCP support
  • Cursor: AI-powered code editor
  • Any MCP-compatible client: The protocol is open and extensible

What Unreal Engine versions are supported?

VibeUE is designed for Unreal Engine 5 (UE5). The UnrealMCP C++ plugin uses modern UE5 APIs for Blueprint and widget manipulation. Compatibility with UE4 is not currently supported.

How does VibeUE communicate with Unreal Engine?

VibeUE uses a three-layer architecture: AI assistants communicate with the Python MCP server via the Model Context Protocol, the Python server translates requests into commands and sends them over TCP (port 55557) to the C++ plugin running inside Unreal Engine, and the C++ plugin directly manipulates Blueprints and assets using Unreal's native APIs.

Is VibeUE open source?

Yes! VibeUE is open source and available on GitHub. The Python MCP server and C++ Unreal plugin are both freely available under an open source license.

Does VibeUE require an internet connection?

The VibeUE MCP server and Unreal Engine plugin work locally and don't require internet connectivity. However, your AI assistant (Claude, Copilot, etc.) may require internet to process your natural language requests and generate MCP tool calls.

🛠️ Troubleshooting

Unreal shows a "Missing Modules" dialog. Now what?

Run the one-click build that ships with VibeUE: double-click Plugins/VibeUE/BuildPlugin.bat once before opening Unreal. The script finds your engine install, locates the project, compiles the plugin, and the dialog disappears on the next launch.

Where is the Python server located if I installed via FAB?

When you install the Plugin via FAB, the Python server is located inside your Engine installation folder, not your project folder. Search for vibe_ue_server.py to find it. For example:

E:\Program Files\Epic Games\UE_5.7\Engine\Plugins\Marketplace\Untitleddd272512e3f0V1\Content\Python

Use this path in your MCP configuration instead of the project-based path used for GitHub installations.

What are the two VS Code MCP configuration options?

VibeUE supports two installation methods, each with its own MCP configuration:

📁 Option A: Local Installation (GitHub Clone)

Use this if you cloned VibeUE into Plugins/VibeUE:

"VibeUE-Local": {
  "type": "stdio",
  "command": "python",
  "args": ["-m", "vibe_ue_server"],
  "env": {
    "PYTHONPATH": "${workspaceFolder}\\Plugins\\VibeUE\\Content\\Python"
  },
  "cwd": "${workspaceFolder}\\Plugins\\VibeUE\\Content\\Python"
}

🎮 Option B: Engine Installation (FAB Marketplace)

Use this if you installed VibeUE via FAB. Find the plugin path by searching for vibe_ue_server.py:

"VibeUE-Engine": {
  "type": "stdio",
  "command": "python",
  "args": ["-m", "vibe_ue_server"],
  "env": {
    "PYTHONPATH": "E:\\Program Files\\Epic Games\\UE_5.7\\Engine\\Plugins\\Marketplace\\[ID]\\Content\\Python"
  },
  "cwd": "E:\\Program Files\\Epic Games\\UE_5.7\\Engine\\Plugins\\Marketplace\\[ID]\\Content\\Python"
}

Choose only ONE configuration - use Option A for local installs, Option B for FAB installs. Both work equally well; pick the one matching your installation method.

Why is my AI assistant not seeing VibeUE tools?

This usually indicates an MCP configuration issue:

  • Verify the Python MCP server is running
  • Check your AI assistant's MCP configuration file points to the correct server path
  • Restart your AI assistant after configuration changes
  • Use the check_unreal_connection tool to verify connectivity

How do I debug connection issues?

Use the built-in check_unreal_connection tool to test the connection between the Python server and Unreal Engine. This tool verifies the C++ plugin is loaded and responding on port 55557.

Where can I get help?

Check our documentation for detailed guides, explore the tools reference to understand available MCP actions, watch our video tutorials, or visit the GitHub repository to report issues or contribute.

🎯 Comparison & Use Cases

How is VibeUE different from Unreal Engine's Python API?

Unreal's Python API is designed for scripting and automation from within the editor. VibeUE adds MCP integration on top of this, enabling AI assistants to control Unreal Engine through natural language. VibeUE also provides a C++ plugin for deeper engine integration and real-time Blueprint manipulation.

Can I use VibeUE for commercial projects?

Yes! VibeUE is open source and can be used in commercial game development projects. Check the license file in the GitHub repository for specific terms and conditions.

What are common VibeUE use cases?

VibeUE excels at:

  • Rapid UI prototyping: Create and iterate on UMG widgets quickly
  • Blueprint scaffolding: Generate Blueprint boilerplate and structure
  • Component configuration: Add and configure actors with multiple components
  • Asset management: Search and organize project assets
  • Learning Unreal Engine: See how AI implements features you describe

Does VibeUE replace manual Unreal Engine development?

No, VibeUE is a productivity tool that accelerates common workflows. It handles repetitive tasks and boilerplate creation so you can focus on creative decisions and fine-tuning. You maintain full control and can manually adjust anything VibeUE creates.

Still Have Questions? 💬

Visit our comprehensive documentation or join the community on GitHub

📚 Read Documentation 🔗 Visit GitHub