UE Game Features and Modular Gameplay

Target engine: UE 5.8. APIs below are verified against the 5.8 headers; older forms are listed under "Deprecated — do not use".

Game Features (Beta in 5.8) packages gameplay as self-contained plugins under Plugins/GameFeatures/. UGameFeaturesSubsystem (a UEngineSubsystem) drives each plugin through a state machine; a UGameFeatureData primary data asset inside the plugin holds an instanced list of UGameFeatureAction objects that run at registration, load, activation and deactivation. Modular Gameplay (Beta in 5.8) supplies UGameFrameworkComponentManager (a UGameInstanceSubsystem) that injects components into opted-in actors, plus the UGameFrameworkComponent bases and the init-state system that orders initialization across independently loaded features. Build.cs modules: GameFeatures and ModularGameplay. The GameFeatures module already depends publicly on ModularGameplay and DataRegistry, so code that only consumes actions needs GameFeatures alone.

Context

Read .agents/ue-project-context.md if it exists (module names, conventions, enabled plugins, GAS/networking setup). Do not stop if it is missing.

Identify the area from the request and the codebase. Ask only when two plausible readings would produce different code.