internals

How the Blender MCP Addon Handles Client Connections in Separate Threads

April 13, 2026 ahujasid/blender-mcp ↗

The Blender MCP addon runs a multi-threaded TCP socket server that delegates each client connection to its own daemonized background thread, then marshals all Blender-specific operations onto the main thread via bpy.app.timers to maintain thread safety.

The ahujasid/blender-mcp repository enables external AI assistants to control Blender through a Model Context Protocol (MCP) interface. Because Blender's Python API (bpy) is not thread-safe, the addon implements a careful concurrency model that isolates network I/O in background threads while ensuring scene manipulation always occurs

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Add to your MCP client configuration:

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

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