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ue-blueprint-cpp-integration

Exposes Unreal Engine C++ classes, functions, and properties to Blueprint via UHT reflection specifiers.

55|5|Updated Mar 26, 2026
Search Tags:#blueprint#c++#reflection#interface#unreal engine#uproperty#ufunction
One-click install
npx skills add https://github.com/kevinpbuckley/unreal-engine-skills --skill ue-blueprint-cpp-integration-kevinpbuckley
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: ue-blueprint-cpp-integration
Source: https://github.com/kevinpbuckley/unreal-engine-skills/tree/main/skills/core/ue-blueprint-cpp-integration
Command: npx skills add https://github.com/kevinpbuckley/unreal-engine-skills --skill ue-blueprint-cpp-integration-kevinpbuckley

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve? Choosing the wrong UFUNCTION, UPROPERTY, or UCLASS specifiers in Unreal Engine C++ causes Blueprint nodes to not appear, properties to stay hidden, or events to never fire. This Skill provides the correct reflection specifier patterns, meta tags, and dispatch rules so C++ code exposes a clean, designer-facing API to Blueprint. ## Core Features & Use Cases - Function exposure: Correct usage of BlueprintCallable, BlueprintPure, BlueprintImplementableEvent, and BlueprintNativeEvent, including the Implementation pattern and calling conventions. - Property exposure: EditAnywhere/EditDefaultsOnly/VisibleAnywhere combined with BlueprintReadWrite/BlueprintReadOnly, plus meta tags like ExposeOnSpawn, ClampMin/ClampMax, and AllowPrivateAccess. - Interfaces and libraries: Blueprint-implementable interfaces with Execute dispatch, TScriptInterface storage, Blueprint function libraries, TSubclassOf and soft references, and BlueprintAssignable delegates. - Use Case: A gameplay programmer writes a C++ health component and needs designers to tweak MaxHealth in the Details panel, bind to an OnHealthDepleted event in the Event Graph, and override an OnAlert behavior in a Blueprint subclass — this Skill gives the exact specifiers and call patterns for each. ## Quick Start Ask the agent to expose a C++ actor's health property and damage function to Blueprint with the correct UPROPERTY and UFUNCTION specifiers for Unreal Engine 5.8.

Frequently Asked Questions about ue-blueprint-cpp-integration

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I expose a C++ function to Blueprint in Unreal Engine?▼

Mark the function with UFUNCTION(BlueprintCallable) for side-effecting calls or UFUNCTION(BlueprintPure) for value queries without exec pins. Always add a Category so the node appears in a meaningful group in the Blueprint context menu.

What is the difference between BlueprintImplementableEvent and BlueprintNativeEvent?▼

BlueprintImplementableEvent has no C++ body; UHT generates the thunk and Blueprint defines the behavior. BlueprintNativeEvent requires a C++ default named FuncName_Implementation, which Blueprint may optionally override.

Why does Cast to my interface return null for Blueprint classes?▼

Cast<IInterface> only works when the interface is implemented in C++, because Blueprint implementors are not added to the C++ vtable. Use Implements<UInterface>() to check and IInterface::Execute_FuncName(Object) to call, which routes to Blueprint overrides.

How do I make a C++ property editable in the Blueprint Details panel?▼

Use UPROPERTY(EditAnywhere, BlueprintReadWrite, Category="...") on the member. EditAnywhere allows editing on class defaults and instances, while BlueprintReadWrite generates get and set nodes in the graph.

Why does my private UPROPERTY with BlueprintReadWrite fail to compile?▼

UHT rejects BlueprintReadOnly or BlueprintReadWrite on private members unless you add meta=(AllowPrivateAccess="true"). Adding that meta tag exposes the private member to Blueprint while keeping it private in C++.

When should I avoid BlueprintPure functions?▼

Avoid BlueprintPure for expensive operations like world queries or array scans, because Blueprint re-evaluates the node for every wire connected to its output. Cache the result in a variable or switch to BlueprintCallable instead.

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