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arg-software-factory/unreal-engine

v4.0.0MIT

Operate a live Unreal Editor over MCP through Unreal Engine 5.8's native in-editor MCP server: spawn actors, build and compile Blueprints, compose levels, configure lighting, inspect Slate widgets, and run automation tests. Connects to the editor's local HTTP endpoint — no third-party server to install. The bundled skills lean into list-first, compile-then-spawn discipline because editor writes silently no-op more than any other DCC.

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Unreal Engine

Unreal Engine 5.8 ships a native MCP server inside the editor. Artyx connects to it directly over local HTTP — there is no third-party server to install.

Install instructions: Unreal MCP in the Unreal Editor

That URL is interface.docsUrl in plugin.json, and it is what the desktop's "How to install" button opens. Epic owns the enable-the-plugin and start-the-server procedure; it is not mirrored here or in the manifest.

Artyx talks to http://127.0.0.1:8000/mcp, the editor's default, as written in mcp.json. The port is the one setting (UNREAL_MCP_PORT): change it only if you started the server on another port. Artyx swaps it into the url; nothing else in the configuration changes.

Troubleshooting

  • Connection refused — The server is not started. It does not auto-start unless the editor preference for it is enabled.
  • Empty tool list — No project is open in the editor.