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Enables AI-driven avatar control and interactions in VRChat through OSC, allowing manipulation of avatar parameters, movement control, message sending, menu toggling, and retrieval of avatar information.
VRChat MCP OSC
VRChat MCP OSC provides a bridge between AI assistants and VRChat using the Model Context Protocol (MCP), enabling AI-driven avatar control and interactions in virtual reality environments.
Overview
By leveraging OSC (Open Sound Control) to communicate with VRChat, VRChat MCP OSC allows AI assistants such as Claude to:
Control avatar parameters and expressions
Send messages in VRChat
Respond to various VR events
And more—all through the high-level API provided by the Model Context Protocol.
Key Features
Avatar Control: Manipulate avatar parameters and expressions
Movement Control: Direct avatar movement and orientation
Communication: Send messages through VRChat's chatbox
Menu Access: Toggle VRChat menu and interface elements
Avatar Information: Query avatar properties and parameters
Seamless VRChat Integration: Automatic detection of avatar configurations
System Requirements
Node.js 18 or higher
VRChat with OSC enabled
Claude Desktop (with MCP support)
Using with Claude Desktop
Clone and npm link
git clone https://github.com/Krekun/vrchat-mcp-osc
cd vrchat-mcp-osc
npm link
Configure Claude Desktop
Configure Claude Desktop by editing the claude_desktop_config.json file:
{
"mcpServers": {
"vrchat-mcp-osc": {
"command": "npx",
"args": [
"vrchat-mcp-osc"
]
}
}
}
Command Line Options
The server supports various command-line arguments for customization:
# Claude Desktop configuration
{
"mcpServers": {
"vrchat-mcp-osc": {
"command": "npx",
"args": [
"vrchat-mcp-osc",
"--websocket-port", "8765",
"--websocket-host", "localhost",
"--osc-send-port", "9000",
"--osc-send-ip", "127.0.0.1",
"--osc-receive-port", "9001",
"--osc-receive-ip", "127.0.0.1",
"--debug"
]
}
}
}
Available Options
Option | Description | Default | Notes |
| WebSocket port | 8765 | For WebSocket communication |
| WebSocket host | localhost | For WebSocket communication |
| OSC send port | 9000 | Port for sending to VRChat |
| OSC send IP | 127.0.0.1 | Address for sending to VRChat |
| OSC receive port | 9001 | Port for receiving from VRChat |
| OSC receive IP | 127.0.0.1 | Address for receiving from VRChat |
| Enable debug logging | false | Output detailed logs |
| Disable relay server | false | When not using relay server |
Available MCP Tools
VRChat MCP OSC exposes the following MCP tools to AI assistants:
Tool Name | Description |
| Retrieves the current avatar's name |
| Lists available avatar parameters |
| Sets a specific avatar parameter |
| Triggers avatar emotes |
| Moves the avatar in a specific direction |
| Controls avatar's view direction |
| Makes the avatar jump |
| Toggles the VRChat menu |
| Toggles voice features |
| Sends a message to the VRChat chatbox |
Troubleshooting
Common Issues
VRChat not responding to commands
Ensure OSC is enabled in VRChat settings
Check that the OSC ports match between VRChat and MCP configuration
Restart VRChat and Claude Desktop
MCP server not starting
Ensure Node.js 18+ is installed
Check command line arguments for errors
Try running with
--debugflag for more detailed logsUse
npx vrchat-mcp-osc -- --debugif direct arguments don't work
NPX execution issues
If arguments aren't being recognized, try using the double dash format:
npx vrchat-mcp-osc -- --debugOn Windows, try running in a command prompt with administrator privileges
If you're having trouble with global installation, try the local npm link approach
Project Structure
vrchat-mcp-osc/
├── packages/
│ ├── mcp-server/ # MCP server implementation (main entry point)
│ ├── relay-server/ # WebSocket to OSC relay
│ ├── types/ # Shared TypeScript interfaces
│ └── utils/ # Common utilities
└── pnpm-workspace.yaml # Workspace configuration
Development
Build From Source
# Clone the repository
git clone https://github.com/Krekun/vrchat-mcp-osc
cd vrchat-mcp-osc
# Install dependencies
pnpm install
# Build all packages
pnpm -r build
# Development mode
pnpm -r dev
License
VRChat MCP OSC is dual-licensed as follows:
For Non-Commercial Use: You may use, modify, and redistribute the software under the terms of the MIT License. (See the MIT License file for details.)
For Commercial Use: Commercial use of this software requires a separate commercial license.
By using this software under the MIT License for non-commercial purposes, you agree to the terms of that license. Commercial users must obtain a commercial license as described above.
Acknowledgments
VRChat team for the OSC integration
Model Context Protocol for the standardized AI interface
Anthropic for Claude's MCP implementation
local-only server
The server can only run on the client's local machine because it depends on local resources.
Tools
Provides a bridge between AI assistants and VRChat, enabling AI-driven avatar control and interactions in virtual reality environments through the Model Context Protocol.
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