BMCP

Control Blender through AI using the Model Context Protocol (MCP).

Features

• Execute Python code directly in Blender
• Query scene state and object properties
• Access real-time context (selected objects, active nodes, etc.)
• Use built-in prompts for common workflows (e.g., explain geometry nodes)
• Automate 3D workflows with AI assistance
• No Python installation required for stdio (uses Blender's built-in Python)

Setup

1. Install the bMCP extension in Blender (4.2+)
2. Open Blender Preferences → Add-ons → bMCP
3. Choose your transport tab and click "Copy Configuration"
4. Paste into your client's MCP config file
5. Start the server: Blender → MCP menu → Start Server

Transport Options

Streamable HTTP (Recommended)

Single endpoint using the MCP 2025-11-25 protocol. Works with most modern MCP clients.

{
  "mcpServers": {
    "blender": {
      "url": "http://localhost:12097/mcp"
    }
  }
}

Use with: Claude Code, Cursor, Windsurf

SSE (Legacy)

For older MCP clients that only support Server-Sent Events.

{
  "mcpServers": {
    "blender": {
      "url": "http://localhost:12097/sse"
    }
  }
}

Use with: LM Studio, legacy MCP clients

Stdio

Bridges stdin/stdout clients to the HTTP server using Blender's bundled Python.

{
  "mcpServers": {
    "blender": {
      "command": "/path/to/blender/python",
      "args": ["-m", "bmcp.transport.stdio", "--port", "12097"],
      "env": {
        "PYTHONPATH": "/path/to/bmcp/wheels/bmcp-1.0.0-py3-none-any.whl"
      }
    }
  }
}

The exact paths are filled in automatically when you use Copy Configuration in the addon preferences.

Use with: Claude Desktop

Security

• Localhost only by default — only 127.0.0.1 connections accepted
• Optional authentication token (Bearer header) for all connections
• Network access can be enabled in preferences, which forces auth on and binds to 0.0.0.0

License

GPL-3.0