A guide to Unreal Engine’s Gameplay Ability System, a framework for organizing abilities, effects, attributes, tags, cues, and multiplayer behavior. It focuses on C++ development in Unreal Engine 5.

Use it to build abilities, manage attributes such as health, apply gameplay effects, use gameplay tags and cues, create ability tasks, and handle prediction and replication.

It gives you established patterns for implementing gameplay that changes player state and must work consistently across networked games.

unreal-gas — Skill for Claude Code and Codex by maystudios

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.

Any agent

npx skills add maystudios/claude-skills --skill unreal-gas

Clone the repo

git clone --depth 1 https://github.com/maystudios/claude-skills

Made for: Claude Code, Codex.

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/skills/maystudios/claude-skills/unreal-gas/github.svg)](https://agentmods.dev/skills/maystudios/claude-skills/unreal-gas)

Your own site

<a href="https://agentmods.dev/skills/maystudios/claude-skills/unreal-gas"><img src="https://agentmods.dev/badge/skills/maystudios/claude-skills/unreal-gas/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/skills/maystudios/claude-skills/unreal-gas"><img src="https://agentmods.dev/badge/skills/maystudios/claude-skills/unreal-gas.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 149 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,441 The whole file, excluding the scripts and references it only reads on demand.

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

NVIDIA SkillSpector pass 7 Sept 2026

How audits are shown

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	$0.00149	$0.01441
Opus 5.5	$0.00060	$0.00576
Sonnet 5.5	$0.00030	$0.00288
Haiku 4.5	$0.00015	$0.00144

Measured 2mo ago against content hash a9c6b22de79f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

unreal-gas 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 2mo 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.

unreal-gas/SKILL.md · 121 lines

How it starts

The opening of the file, as written. The whole thing — 121 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Unreal Engine Gameplay Ability System (GAS) -- C++ Guide

Official Documentation (always consult for latest details)

These are the authoritative sources. Reference them for up-to-date API details, as GAS evolves across engine versions:

Source	URL
Epic GAS Landing Page	https://dev.epicgames.com/documentation/en-us/unreal-engine/gameplay-ability-system-for-unreal-engine
Understanding GAS (Overview)	https://dev.epicgames.com/documentation/en-us/unreal-engine/understanding-the-unreal-engine-gameplay-ability-system
ASC & Attributes	https://dev.epicgames.com/documentation/en-us/unreal-engine/gameplay-ability-system-component-and-gameplay-attributes-in-unreal-engine
Gameplay Abilities	https://dev.epicgames.com/documentation/en-us/unreal-engine/using-gameplay-abilities-in-unreal-engine
Attributes & Attribute Sets	https://dev.epicgames.com/documentation/en-us/unreal-engine/gameplay-attributes-and-attribute-sets-for-the-gameplay-ability-system-in-unreal-engine
Gameplay Effects	https://dev.epicgames.com/documentation/en-us/unreal-engine/gameplay-effects-for-the-gameplay-ability-system-in-unreal-engine
Ability Tasks	https://dev.epicgames.com/documentation/en-us/unreal-engine/gameplay-ability-tasks-in-unreal-engine
Community GAS Docs (tranek)	https://github.com/tranek/GASDocumentation

The community docs by tranek are the most comprehensive single resource for GAS. They cover advanced topics (prediction internals, optimization, replication modes, pitfalls) that Epic's official docs do not. Always check them for edge cases and production patterns.

The Lyra Sample Project is Epic's recommended working reference implementation for GAS.

Plugin Setup

Enable Gameplay Abilities plugin in the editor

Add to Build.cs:

PublicDependencyModuleNames.AddRange(new string[] {
    "GameplayAbilities", "GameplayTags", "GameplayTasks"
});

UE 5.2 and earlier: call UAbilitySystemGlobals::Get().InitGlobalData() in your AssetManager or GameInstance. UE 5.3+ does this automatically.

Read the full file on GitHub · 121 lines

Files

What ships with it

4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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.

2mo ago First seen · 121 lines · 149 tokens per session scan A a9c6b22de79f

Subscribe to this mod's changes

unreal-gas is a skill published in the GitHub repository maystudios/claude-skills (26 stars, last pushed 2mo ago), licensed MIT. It adds 149 tokens to every session and 1,441 once invoked, about $0.0006 per session on Opus 5.5. 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 2026-08-30.

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