What is unreal-mcp GEMINI.md?

A set of project instructions for an MCP server that lets an AI assistant control an open Unreal Engine editor through a Node.js/TypeScript server and a C++ plugin. Unreal Engine is software for building games and interactive 3D applications.

Use it when developing or maintaining the Unreal Engine MCP server, its editor connection, or tools for actors, assets, Blueprints, and engine commands.

It explains the repository's split architecture and the requirements for building, running, and connecting its parts.

How Flux-Point-Studios/unreal-mcp configures Gemini CLI

Reuse

Borrowing it

Nothing to install: this file belongs to Flux-Point-Studios/unreal-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/Flux-Point-Studios/unreal-mcp/main/GEMINI.md

Clone the repo

git clone --depth 1 https://github.com/Flux-Point-Studios/unreal-mcp

Made for: Gemini CLI.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/flux-point-studios/unreal-mcp/gemini-md/github.svg)](https://agentmods.dev/instructions/flux-point-studios/unreal-mcp/gemini-md)

Your own site

<a href="https://agentmods.dev/instructions/flux-point-studios/unreal-mcp/gemini-md"><img src="https://agentmods.dev/badge/instructions/flux-point-studios/unreal-mcp/gemini-md/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/flux-point-studios/unreal-mcp/gemini-md"><img src="https://agentmods.dev/badge/instructions/flux-point-studios/unreal-mcp/gemini-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 1,010 This file is loaded in full into every session.

When invoked 1,010 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.01010	$0.01010
Opus 5	$0.00505	$0.00505
Sonnet 5	$0.00202	$0.00202
Haiku 4.5	$0.00101	$0.00101

Measured 9d ago against content hash a92161d9fcee, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

unreal-mcp GEMINI.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

mcp-server-unreal-engine GEMINI.md — 100% identical, 0 lines differ

GEMINI.md · 99 lines

How it starts

The opening of the file, as written. The whole thing — 99 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Unreal Engine MCP Server

Project Overview

The Unreal Engine MCP Server (unreal-engine-mcp-server) is a comprehensive Model Context Protocol (MCP) server that enables AI assistants to control Unreal Engine via a native automation bridge. It facilitates bidirectional communication between an AI agent (running via MCP) and an active Unreal Engine Editor session.

Architecture

The system is composed of three main components:

MCP Server (Node.js/TypeScript):
- Role: The core server that implements the MCP protocol, handles client requests, and orchestrates communication.
- Location: src/
- Key File: src/index.ts (Entry point), src/unreal-bridge.ts (Connection management).
- Tools: Defines MCP tools for Actor manipulation, Asset management, Blueprints, etc. (found in src/tools/).
Unreal Engine Plugin (C++):
- Role: Acts as the receiver and executor within the Unreal Engine process. It runs a WebSocket server to listen for commands from the Node.js server.
- Location: Plugins/McpAutomationBridge/
- Key Functionality: Handles execute_console_command, set_object_property, and other engine-level operations on the Game Thread.
- Communication: Listens on ws://localhost:8091 (default).

Building and Running

Prerequisites

Node.js (v18 or higher)
Unreal Engine (5.0-5.7)

Setup

Install Dependencies:
```
npm install
```
Build the Server:
```
npm run build
```
1. Unreal Plugin Installation:
- Regenerate project files and recompile your Unreal project.
- Enable the plugin in the Unreal Editor if it's not automatically enabled.
- Ensure the plugin is running (it should log "MCP Automation Bridge listening" to the Output Log).

Running the Server

To start the MCP server:

npm start

Or for development with ts-node:

npm run dev

Testing

The project includes a suite of integration tests located in the tests/ directory. These scripts act as "fake" MCP clients to verify functionality.

Read the full file on GitHub · 99 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

9d ago First seen · 99 lines · 1,010 tokens per session scan A a92161d9fcee

Subscribe to this mod's changes

unreal-mcp GEMINI.md is an instructions file published in the GitHub repository Flux-Point-Studios/unreal-mcp (8 stars, last pushed 4mo ago), licensed MIT. It adds 1,010 tokens to every session, about $0.0051 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).

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unreal-mcp: Instructions file for Gemini CLI