UE Networking & Replication

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

Server-authoritative replication for actors, components and subobjects. Core APIs live in the Engine module (GameFramework/Actor.h, Engine/NetDriver.h, Net/UnrealNetwork.h) and the NetCore module (Net/Core/PushModel/PushModel.h, Net/Serialization/FastArraySerializer.h). ELifetimeCondition and REPNOTIFY_* come from CoreUObject (UObject/CoreNetTypes.h). Optional systems: the Iris replication system (IrisCore module, SetupIrisSupport(Target) in Build.cs) and the ReplicationGraph plugin (Beta in 5.8, Build.cs module ReplicationGraph).

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.