Summary

Compile errors come back structured — that is the loop that makes it work.

`blueprint-compile` and `source-compile` returning a parsed error and warning list rather than console text is what turns this from a remote control into something an agent can iterate with: make the change, compile, read what broke, fix it. The screenshot family closes the same loop visually, returning PNG image content the model can actually inspect. Two limits to plan around: pixel capture needs a GPU-backed editor and returns a structured error under headless `-nullrhi`, and capture dimensions are clamped at 2048 per side.

What it is

An Unreal Engine plugin plus a bridge that exposes the editor as MCP tools. Tool ids are kebab-case and grouped into families, matching the naming used by the same author's Unity and Godot plugins.

What you get

61 built-in tools across 7 families, plus 3 system tools deliberately kept out of `tools/list` so they never spend tokens
Actors and components (13): `actor-create`, `actor-find`, `actor-modify`, `actor-set-parent`, `actor-component-add`, `object-get-data`, `object-modify` and the rest
Blueprints (11): `blueprint-create`, `blueprint-get` for a graph summary, `blueprint-add-variable`, `blueprint-add-function`, `blueprint-add-event`, `blueprint-set-default`, `blueprint-spawn`, and `blueprint-compile` which returns a structured error and warning list
Assets (11): `asset-find` over the AssetRegistry, `asset-import` for FBX and textures, `asset-material-create` and `asset-material-modify`
Editor and reflection (9): `editor-application-set-state` to start and stop Play-In-Editor, `console-get-logs`, `console-run-command`, `reflection-method-find` and `reflection-method-call` to discover and invoke UFunctions
Levels (7): `level-create`, `level-open`, `level-save`, `level-get-data`, `level-list-loaded` (World-Partition aware)
C++ source (6): `source-read`, `source-create-class`, `source-update`, `source-compile` with a structured error report — all file operations jailed to the project's Source directory
Screenshots (4): `screenshot-viewport`, `screenshot-game-view`, `screenshot-camera` and `screenshot-isolated`, returned as base64 PNG image content the model can look at
Every tool can be enabled or disabled individually from the MCP Tools window in the editor

Requirements

Unreal Engine 5.5 or newer — developed and CI-tested against 5.7, verified on 5.8 — and a C++ Unreal project, since the plugin builds an editor module. The current install path is the npm package unreal-mcp-cli, version 0.16.0: `npm install -g unreal-mcp-cli`, then `install-plugin`, `login` against ai-game.dev, and `open`. Node.js `^20.19.0 || >=22.12.0` is needed for the CLI. A Fab / Epic Marketplace listing with precompiled per-engine binaries is announced but not yet live.

Setup effort

One command — npm install -g unreal-mcp-cli

Unreal-MCP