Installation & Setup

Requirements

• Unity 6000.0+ (Unity 6)

• Newtonsoft JSON (com.unity.nuget.newtonsoft-json) — installed automatically as dependency

• git must be installed and available in PATH — git-scm.com

Installation

Via Unity Asset Store (Recommended)

Install directly from the Unity Asset Store:

realvirtual MCP Server on Unity Asset Store

Via Unity Package Manager (Git URL)

1. Open Unity Window > Package Manager

2. Click + > Add package from git URL

3. Enter: https://github.com/game4automation/io.realvirtual.mcp.git

Both methods install the package with all dependencies automatically.

Setup

Automated Setup (Recommended)

After installing the package:

1. A brain icon appears in the Unity Scene View toolbar — this is the MCP status indicator

2. Click the gear icon next to it to open the setup popup

3. Click Download Python Server — this runs git clone to download the Python server into Assets/StreamingAssets/realvirtual-MCP/

4. Click Configure Claude Code & Desktop — this writes the MCP configuration to Claude Desktop and/or Claude Code

Setup popup showing initial state with Python server not yet installed

Once configured, the popup shows green status indicators:

Setup popup after successful configuration

You can also access setup via the Unity menu: Tools > realvirtual > MCP

MCP menu in Unity Editor

Manual Setup

If you prefer to set up manually:

1. Clone the Python server repository:

   cd <your-project>/Assets/StreamingAssets
   git clone https://github.com/game4automation/realvirtual-MCP.git

2. Configure your MCP client manually. For Claude Code, add to your MCP settings:

   {
     "mcpServers": {
       "realvirtual-unity": {
         "command": "<project-path>/Assets/StreamingAssets/realvirtual-MCP/python/python.exe",
         "args": ["<project-path>/Assets/StreamingAssets/realvirtual-MCP/unity_mcp_server.py"]
       }
     }
   }

Command Line Options

The Python server takes a few optional flags. The one worth knowing about:

Flag	Effect
--webviewer	Starts the historic web_* WebSocket proxy on port 18712. Off by default since MCP server 1.1.2.
--no-webviewer	Accepted and ignored — it was the way to switch the proxy off while it was still on by default.

The web_* browser tools of realvirtual WEB belong to realvirtual CONNECT (http://localhost:5100/mcp), which serves them behind its community registration. The proxy in this server offered the same tool names without any registration check, so it no longer starts on its own. The Unity Editor tools of this server are unaffected and need no registration.

Updating

An already installed Python server does not update itself — the downloader skips a directory that is already there. After updating the Unity package, click Update Python Server (git pull) once, or the server keeps running the version you downloaded first.

Python Server

Click Update Python Server (git pull) in the toolbar popup, or run manually:

cd <your-project>/Assets/StreamingAssets/realvirtual-MCP
git pull

Unity Package

1. Open Window > Package Manager

2. Select realvirtual MCP Server

3. Click Update (if available)

If no update button appears, remove the lock entry for io.realvirtual.mcp from Packages/packages-lock.json and reopen Unity.