Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/EpicGames/unreal-engine-skills-for-claude-code-pluginnpx agentmods add skills/epicgames/unreal-engine-skills-for-claude-code-plugin/create-toolsetWrote 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/epicgames/unreal-engine-skills-for-claude-code-plugin/create-toolset)<a href="https://agentmods.dev/skills/epicgames/unreal-engine-skills-for-claude-code-plugin/create-toolset"><img src="https://agentmods.dev/badge/skills/epicgames/unreal-engine-skills-for-claude-code-plugin/create-toolset.svg" alt="Measured on agentmods" height="20"></a>- NVIDIA SkillSpector 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 | $0.00257 | $0.05120 |
| Opus 5 | $0.00129 | $0.02560 |
| Sonnet 5 | $0.00051 | $0.01024 |
| Haiku 4.5 | $0.00026 | $0.00512 |
Grade A, and why
create-toolset 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 8d 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 — 421 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Create Toolset
You are authoring or extending an Unreal Engine toolset: a collection of static, AI-callable functions registered with the ToolsetRegistry and exposed through the MCP server. The goal is to expand the surface of things Claude can do inside the editor.
Principles
A good toolset is:
Clean: Design the simplest API that can do useful work in the domain. Don't mirror Unreal's existing APIs directly; they're often unnecessarily complex. A good heuristic: would a technical artist understand this without reading the implementation?
Complete: Support CRUD symmetry. If you can set a thing, you should be able to get it. If there's a create, there should be a delete. Getters without setters are fine when mutation isn't possible or useful.
Composable: Use consistent types for the same kinds of operation across the toolset. If get_graph() returns a Graph, then get_graph_nodes() should accept a Graph. Functions should combine naturally to produce more complex results.
DRY: No duplication within a toolset, and no duplication across toolsets. ObjectTools already provides generic UObject property get/set. Don't reimplement it. If functionality lives elsewhere, call it or point to it.
Before You Write
Work through these questions in order before touching any code.
1. Does the functionality already exist? If the editor is running, call list_toolsets via MCP, then describe_toolset on anything relevant. If MCP isn't available, search the codebase for folders named Toolsets and read the C++ headers or Python toolset files there. If the capability is already exposed, there's nothing to do. Tell the user and point them to the right tool.
2. Is the request more general than it sounds? Users often ask for something domain-specific that is actually an instance of a broader pattern. Before looking for a domain toolset, ask whether the capability truly belongs to that domain or whether it applies more widely. For example, a request for "read blueprint asset metadata" sounds like it belongs in BlueprintTools, but metadata applies to all assets, so the right place is AssetTools. Solving it generically is almost always better than solving it narrowly.
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.
- 8d ago First seen · 421 lines · 257 tokens per session scan A e9d050087f36
create-toolset is a skill published in the GitHub repository EpicGames/unreal-engine-skills-for-claude-code-plugin (273 stars, last pushed 1mo ago), licensed MIT. It adds 257 tokens to every session and 5,120 once invoked, about $0.0013 per session on Opus 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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