setup

UE5 Blueprint Skills — Setup

Walk the user through enabling Python remote execution in their Unreal Engine 5 project. This is a one-time setup.

Prerequisites Check

Run these checks first:

1. Python 3 installed?

   python --version
   

2. upyrc installed?

   pip show upyrc
   

   If not installed: pip install upyrc

3. UE5 Editor running? Ask the user if they have their project open.

UE5 Editor Setup

Guide the user through these steps in the Unreal Editor:

Step 1: Enable the Python Plugin

1. Open Edit > Plugins
2. Search for "Python Editor Script Plugin"
3. Enable it (check the box)
4. Restart the editor if prompted

Step 2: Enable Remote Execution

1. Open Edit > Project Settings
2. Search for "Python" in the settings search bar
3. Under Python > Remote Execution:
   • Check Enable Remote Execution
   • Multicast Group Endpoint: 239.0.0.1:6766 (default)
   • Multicast Bind Address: 127.0.0.1 (default, leave as-is)

Step 3: Test the Connection

Run the test script:

python "${CLAUDE_PLUGIN_ROOT}/scripts/test_connection.py"

If it prints "Connected to UE5 Editor" — setup is complete.

If it fails:

• Make sure the UE5 Editor is running
• Check that no firewall is blocking UDP port 6766 or TCP port 53320
• Try restarting the editor after enabling the Python plugin

Known Gotchas

Tell the user about these before they start writing custom scripts:

• __file__ doesn't exist in remote execution context. Scripts run inside UE5 can't use __file__ or relative paths — use absolute paths or environment variables.
• Asset path format varies by project. Some projects use /Game/MyProject/..., others use short paths like /MyMod/.... If one format fails, try the other. The export scripts handle both.
• Scripts time out at 120 seconds by default. For very large Blueprints, increase the timeout with --timeout 300.
• Only one remote connection at a time. If VS Code or another tool is connected to UE5's Python bridge, disconnect it first or the connection will fail.

Reference

The remote execution protocol is provided by upyrc — a Python wrapper around UE5's built-in remote control API. The connection uses UDP multicast (239.0.0.1:6766) for discovery and TCP (127.0.0.1:53320) for command execution.

Done

Tell the user:

• They can now use /ue5-blueprints:blueprint-export to export Blueprints
• They can use /ue5-blueprints:blueprint-check to analyze pasted Blueprint data
• They can use /ue5-blueprints:blueprint-audit for deep analysis of exported data
• Setup only needs to happen once per project