HoudiniMCP allows you to control SideFX Houdini from Claude using the Model Context Protocol (MCP). It consists of:

1. A Houdini plugin (Python package) that listens on a local port (default localhost:9876) and handles commands (creating and modifying nodes, executing code, etc.).
2. An MCP bridge script you run via uv (or system Python) that communicates via stdin/stdout with Claude and TCP with Houdini.

Below are the complete instructions for setting up Houdini, uv, and Claude Desktop.

1. Requirements
2. Houdini MCP Plugin Installation
   1. Folder Layout
   2. Shelf Tool (Optional)
   3. Packages Integration (Optional)
3. Installing the mcp Python Package
   1. Using uv on Windows
   2. Using pip Directly
4. Bridging Script and Claude for Desktop
   1. The Bridging Script
   2. Telling Claude Desktop to Use Your Script
5. Testing & Usage
6. Troubleshooting

• SideFX Houdini
• uv
• Claude Desktop (latest version)

Create a folder in your Houdini scripts directory: C:/Users/YourUserName/Documents/houdini19.5/scripts/python/houdinimcp/

Inside houdinimcp/, place:

• __init__.py – handles plugin initialization (start/stop server)
• server.py – defines the HoudiniMCPServer (listening on port 9876)
• houdini_mcp_server.py – optional bridging script (some prefer a separate location)
• pyproject.toml

(If you prefer, houdini_mcp_server.py can live elsewhere. As long as you know its path for running with uv.)

create a Shelf Tool to toggle the server in Houdini:

1. Right-click a shelf → "New Shelf..."

Name it "MCP" or something similar

2. Right-click again → "New Tool..." Name: "Toggle MCP Server" Label: "MCP"

3. Under Script, insert something like:

   import hou
   import houdinimcp

   if hasattr(hou.session, "houdinimcp_server") and hou.session.houdinimcp_server:
       houdinimcp.stop_server()
       hou.ui.displayMessage("Houdini MCP Server stopped")
   else:
       houdinimcp.start_server()
       hou.ui.displayMessage("Houdini MCP Server started on localhost:9876")

If you want Houdini to auto-load your plugin at startup, create a package file named houdinimcp.json in the Houdini packages folder (e.g. C:/Users/YourUserName/Documents/houdini19.5/packages/):

{
  "path": "$HOME/houdini19.5/scripts/python/houdinimcp",
  "load_package_once": true,
  "version": "0.1",
  "env": [
    {
      "PYTHONPATH": "$PYTHONPATH;$HOME/houdini19.5/scripts/python"
    }
  ]
}

  # 1) Install uv 
  powershell -c "irm https://astral.sh/uv/install.ps1 | iex"

  # 2) add uv to your PATH (depends on the user instructions) from cmd
  set Path=C:\Users\<YourUserName>\.local\bin;%Path%

  # 3) In a uv project or the plugin directory
  cd C:/Users/<YourUserName>/Documents/houdini19.5/scripts/python/houdinimcp/
  uv add "mcp[cli]"

  # 4) Verify
  uv run python -c "import mcp.server.fastmcp; print('MCP is installed!')"

Go to File > Settings > Developer > Edit Config > Open or create: claude_desktop_config.json

Add an entry:

{
  "mcpServers": {
    "houdini": {
      "command": "uv",
      "args": [
        "run",
        "python",
        "C:/Users/<YourUserName>/Documents/houdini19.5/scripts/python/houdinimcp/houdini_mcp_server.py"
      ]
    }
  }
}

if uv run was successful and claude failed to load mcp, make sure claude is using the same python version, use:

  python -c "import sys; print(sys.executable)"

to find python, and replace "python" with the path you got.

Go to Settings > MCP > add new MCP server add the same entry in claude_desktop_config.json you might need to stop claude and restart houdini and the server

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Houdini-MCP was built following blender-mcp. We thank them for the contribution.