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Introduction

What is OpenForge MCP?​

OpenForge MCP is a free tool that lets you control Unity and Blender just by talking to an AI.

You will see the term "MCP" -- it stands for Model Context Protocol, a standard for connecting AI to applications. Don't worry about the technical details. Think of it like Bluetooth pairing your phone with headphones: MCP pairs an AI with the software you use (Unity, Blender, Godot).

In practice, you simply tell the AI what you want in plain English, and the AI operates Unity or Blender directly. No code required.

Get started in 3 steps​

Getting up and running with OpenForge MCP is straightforward.

Step 1 -- Install

Install Node.js, then run npx openforge-mcp setup in a terminal.

View the installation guide -->

Step 2 -- Add the plugin

Install the plugin for your app (Unity / Blender / Godot).

Add the plugin via Unity Package Manager. See Unity Plugin for details.

Step 3 -- Talk to the AI

Open an AI client (such as Claude Desktop) and describe what you want to build.

Set up your AI client -->

What can it do?​

Here are a few examples -- just tell the AI what you want and it builds it for you.

World building:

"Build a ruined city. Line up about three crumbling buildings, add cracks to the road, and set the lighting to a sunset atmosphere."

Game development:

"Create a mechanic where the door opens automatically when the player gets close."

"Set up ragdoll physics on the character so it collapses naturally when it falls."

See the Scene Building tutorial for more.

These are just a few examples. Share your idea and the AI will bring it to life.

Four key features of OpenForge MCP​

1. The AI sees the result and fixes it on its own​

The AI can inspect its own work. If it notices something is off -- say an object is slightly misplaced -- it corrects the issue without you having to point it out. Less back-and-forth means less frustration.

2. Cross-app in a single conversation​

You can say "Model this in Blender, then bring it into Unity and place it in the scene" -- all in one conversation. No manual file transfers, no switching between apps.

See the Cross-App tutorial for details.

3. Save and restore like a video game​

Say "Save the current state" and it is saved. Say "Go back to the previous state" and it is restored. It works just like save and load in a game.

See the Save & Restore tutorial for details.

4. The AI playtests your game and finds bugs​

You can ask "Play through this game and check for anything wrong." The AI runs the game itself and reports any bugs or oddities it finds.

See the AI Playtest tutorial for details.

Who is this for?​

  • VRChat world and avatar creators -- No 3D modeling or programming knowledge required
  • Solo game developers -- Powerful support for indie developers juggling every role
  • Students learning 3D CG -- Learn by doing, with the AI as your guide
  • Hobbyist creators -- If you have an idea, the AI lowers the technical barriers

No programming experience is needed. Just describe what you want and get started.

Completely free​

OpenForge MCP is completely free and will stay that way. It is released under the MIT license, an open-source license that means anyone can use it freely, including for commercial projects.

When you are ready, head to the Installation page to get started.

Where should I start?​

GoalRecommended page
Try it out right awayFirst Steps
Use it with UnityUnity Usage
Use it with BlenderBlender Usage
Build VRChat worlds/avatarsVRChat Mode Overview
Student looking to start for freeStudents Can Start for Free
Browse all available toolsTool Explorer
Advanced workflowsAdvanced Tutorial
Contribute to developmentContributing Guide
See every pageFull Sitemap