internals

How the Blender MCP Addon Executes Commands on Blender's Main Thread

April 13, 2026 ahujasid/blender-mcp ↗

The Blender MCP addon runs a TCP server in a background thread and uses bpy.app.timers.register to schedule command execution on Blender's main UI thread, ensuring thread-safe access to Blender's Python API.

The ahujasid/blender-mcp repository implements a robust mechanism for external applications to control Blender programmatically. Since Blender's Python API (bpy) is not thread-safe, the addon must bridge the gap between its asynchronous network layer and Blender's single-threaded UI loop to prevent crashes when manipulating scene data.

Why Blender's Main Thread

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Share the following with your agent to get started:

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Add to your MCP client configuration:

{
  "mcpServers": {
    "instagit": {
      "command": "npx",
      "args": ["-y", "instagit@latest"]
    }
  }
}

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