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.
npx skills add quodsoler/unreal-engine-skills --skill ue-cpp-foundationsgit clone --depth 1 https://github.com/quodsoler/unreal-engine-skillsWrote 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.
[](https://agentmods.dev/skills/quodsoler/unreal-engine-skills/ue-cpp-foundations)<a href="https://agentmods.dev/skills/quodsoler/unreal-engine-skills/ue-cpp-foundations"><img src="https://agentmods.dev/badge/skills/quodsoler/unreal-engine-skills/ue-cpp-foundations/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.
<a href="https://agentmods.dev/skills/quodsoler/unreal-engine-skills/ue-cpp-foundations"><img src="https://agentmods.dev/badge/skills/quodsoler/unreal-engine-skills/ue-cpp-foundations.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
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 | $0.00180 | $0.07038 |
| Opus 5.5 | $0.00072 | $0.02815 |
| Sonnet 5.5 | $0.00036 | $0.01408 |
| Haiku 4.5 | $0.00018 | $0.00704 |
Grade A, and why
ue-cpp-foundations 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 25d 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.
How it starts
The opening of the file, as written. The whole thing — 500 lines — stays where its author put it; the contents beside it link to each section on GitHub.
UE C++ Foundations
Target engine: UE 5.8. APIs below are verified against the 5.8 headers; older forms are listed under "Deprecated — do not use".
This skill covers the C++ layer every Unreal module is built on: reflection macros (UCLASS, UPROPERTY, UFUNCTION, USTRUCT, UENUM, UINTERFACE), containers, delegates, string types, object lifetime and garbage collection, CDO access, and the subsystem family. All of it lives in the Core, CoreUObject and Engine modules (PublicDependencyModuleNames.AddRange(new string[] { "Core", "CoreUObject", "Engine" });). Editor subsystems additionally need EditorSubsystem and UnrealEd in an editor-only module.
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.
| Request is about… | Go to |
|---|---|
UCLASS, UPROPERTY, UFUNCTION, USTRUCT, UENUM specifiers |
Reflection Macros |
TArray, TMap, TSet, TOptional, TVariant |
Containers |
Delegates, events, AddDynamic, Broadcast |
Delegates |
FName, FString, FText, LOCTEXT |
String Types |
TObjectPtr, TWeakObjectPtr, TSharedPtr, GC roots, FGCObject |
Object Lifetime and Pointers |
Class default objects, GetDefault, TNotNull parameters |
CDO Access and Non-Null Parameters |
| Game instance / world / local player / engine / editor subsystems | Subsystems |
Replicated, ReplicatedUsing, GetLifetimeReplicatedProps |
Replicated Properties |
UE_LOG, log categories |
Logging |
WITH_EDITOR, UE_BUILD_SHIPPING guards |
Conditional Compilation Guards |
What ships with it
3 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.
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.
- 25d ago Changed · -1 lines · +71 tokens per session 7d6c5cfd3891
- 1mo ago First seen · 501 lines · 109 tokens per session scan A 678808de742a
ue-cpp-foundations is a skill published in the GitHub repository quodsoler/unreal-engine-skills (403 stars, last pushed 26d ago), licensed MIT. It adds 180 tokens to every session and 7,038 once invoked, about $0.0007 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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