tranek/gasdocumentation

GASDocumentation is a detailed community-written guide to Unreal Engine 5's GameplayAbilitySystem plugin, commonly abbreviated as GAS. The author is clear that this is not official documentation and has no affiliation with Epic Games, but the guide draws on extensive hands-on experience and aims to share knowledge that is typically passed around informally among experienced developers. GAS is a built-in Unreal Engine plugin designed to help game developers build complex ability systems, such as a character casting spells, gaining buffs, taking damage, or triggering cooldowns. It handles networking automatically, so these mechanics stay synchronized across a multiplayer game without the developer having to write custom replication code for each one. The documentation covers the plugin's core concepts in depth: Ability System Components (which attach to characters or objects that participate in the ability system), Gameplay Tags (flexible labels used to identify states and filter conditions), Attributes (numeric values like health or mana), Gameplay Effects (the mechanism by which those values are modified), and Gameplay Abilities (the actual actions a character can perform). Each section explains the concept, how the code is structured, and common patterns or pitfalls drawn from real project experience. A sample multiplayer project is included so readers can see the concepts working in context. The documentation targets Unreal Engine 5.3, and older engine-version branches exist but are no longer maintained. A companion project called GASShooter demonstrates more advanced techniques for a multiplayer first- and third-person shooter. The full README is longer than what was shown.