unreal-engine

unreal-engine is a plugin for Claude Code from HermeticOrmus/LibreGameDev-Claude-Code. Its manifest loads nothing; the 1 skill, 1 command, 1 agent it bundles cost 135 tokens per session together, scanned A, original, MIT.

A guide to developing games with Unreal Engine 5 using either visual Blueprints or C++. It covers gameplay structure, abilities, input, multiplayer replication, and modern lighting and geometry systems.

In plain words
What is it for?
Use it when building Unreal gameplay, abilities, input, replicated multiplayer features, or projects using Lumen lighting and Nanite geometry.
Why use it?
It helps you decide where game logic belongs and which Unreal system fits a feature. It also explains the main choices between visual scripting and code.

Plugin for Claude Code

Written for Claude Code: a Claude Code plugin manifest.

Good fit Use it when building Unreal gameplay, abilities, input, replicated multiplayer features, or projects using Lumen lighting and Nanite geometry.

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Install in Claude Code
/plugin marketplace add HermeticOrmus/LibreGameDev-Claude-Code
/plugin install unreal-engine
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo
git clone --depth 1 https://github.com/HermeticOrmus/LibreGameDev-Claude-Code

Made for: Claude Code.

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.

agentmods badge for unreal-engine

README.md
[![agentmods](https://agentmods.dev/badge/plugins/hermeticormus/libregamedev-claude-code/unreal-engine/github.svg)](https://agentmods.dev/plugins/hermeticormus/libregamedev-claude-code/unreal-engine)
Your own site
<a href="https://agentmods.dev/plugins/hermeticormus/libregamedev-claude-code/unreal-engine"><img src="https://agentmods.dev/badge/plugins/hermeticormus/libregamedev-claude-code/unreal-engine/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.

agentmods 80×15 button for unreal-engine

Your own site · 80×15
<a href="https://agentmods.dev/plugins/hermeticormus/libregamedev-claude-code/unreal-engine"><img src="https://agentmods.dev/badge/plugins/hermeticormus/libregamedev-claude-code/unreal-engine.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session not measured What this adds to a session before it is invoked.
When invoked not measured The manifest loads nothing itself; its 1 skill, 1 command, 1 agent cost 135 tokens a session between them.
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.
Security

Grade A, and why

unreal-engine 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 15d 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.

plugins/unreal-engine/.claude-plugin/plugin.json · 22 lines

What it actually says

{
  "name": "unreal-engine",
  "version": "1.0.0",
  "description": "Unreal Engine 5 development: Gameplay Framework, Blueprint or C++, the Gameplay Ability System, Enhanced Input, replication, and Lumen and Nanite.",
  "author": {
    "name": "Diego Bodart",
    "url": "https://github.com/HermeticOrmus"
  },
  "homepage": "https://github.com/HermeticOrmus/LibreGameDev-Claude-Code",
  "repository": "https://github.com/HermeticOrmus/LibreGameDev-Claude-Code",
  "license": "MIT",
  "keywords": [
    "unreal",
    "unreal-engine-5",
    "cpp",
    "blueprints",
    "gas",
    "replication",
    "gamedev"
  ]
}
Contents

What it installs

The manifest is a name and a version. 1 skill, 1 command, 1 agent travel with it, and installing the plugin installs all of them — 135 tokens a session between them. Each is measured on its own page, and each can be installed alone.

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.

  1. 15d ago First seen · 22 lines scan A 2ec6d222d0da

Subscribe to this mod's changes

unreal-engine is a plugin published in the GitHub repository HermeticOrmus/LibreGameDev-Claude-Code (5 stars, last pushed 15d ago), licensed MIT. Its token cost is not measured: this kind of file is read by the harness, not the model. 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 2026-10-01.