Open-source tool enables Claude to control Unreal Engine directly

soft-ue-cli is an open-source tool that enables Claude AI agents to directly control Unreal Engine through command execution. It consists of a Python CLI tool and a C++ plugin that runs inside UE, allowing Claude to send commands that UE executes without manual editor interaction.

How it works

The tool provides two usage modes:

• Claude Code – runs soft-ue-cli commands in the terminal
• Claude Desktop / Cursor / Windsurf – connects via MCP using soft-ue-cli mcp-serve

Example workflow

A typical session involves asking Claude to "inspect the player Blueprint and add a health component." Claude executes:

soft-ue-cli query-blueprint /Game/BP_Player --include components,variables
soft-ue-cli add-graph-node /Game/BP_Player K2Node_CallFunction \
--properties '{"FunctionReference": {"MemberName": "CreateWidget"}}'
soft-ue-cli compile-blueprint /Game/BP_Player

This allows Claude to read Blueprints, modify them, and compile them autonomously.

Available operations

The tool provides 60+ commands including:

• Spawn actors
• Edit Blueprint graphs
• Start/stop Play-In-Editor sessions
• Send input events
• Inspect materials
• Capture screenshots
• Profile performance with UE Insights
• Run Python scripts inside UE

Setup

Installation requires:

• pip install soft-ue-cli
• Copy one plugin folder into your UE project
• Rebuild the project
• For MCP mode: pip install soft-ue-cli[mcp]

The developer reports that this significantly accelerates the feedback loop, allowing Claude to query the level, make changes, compile, run the game, and verify results without manual window switching.

The tool is MIT licensed with a single dependency and is available on GitHub at github.com/softdaddy-o/soft-ue-cli.