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 agentmods add skills/db-lyon/ue-mcp/ue-mcp-native-cppnpx skills add db-lyon/ue-mcp --skill ue-mcp-native-cppgit clone --depth 1 https://github.com/db-lyon/ue-mcpWrote 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/db-lyon/ue-mcp/ue-mcp-native-cpp)<a href="https://agentmods.dev/skills/db-lyon/ue-mcp/ue-mcp-native-cpp"><img src="https://agentmods.dev/badge/skills/db-lyon/ue-mcp/ue-mcp-native-cpp.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00083 | $0.00977 |
| Opus 5 | $0.00042 | $0.00489 |
| Sonnet 5 | $0.00017 | $0.00195 |
| Haiku 4.5 | $0.00008 | $0.00098 |
Grade A, and why
ue-mcp-native-cpp 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 5d 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 — 51 lines — stays where its author put it; the contents beside it link to each section on GitHub.
ue-mcp native C++ authoring
The project tool wraps GameProjectUtils::AddCodeToProject and ILiveCodingModule so agents can author native C++ end-to-end without Python or the editor UI.
The authoring loop
- Pick a module.
project(action="list_project_modules")enumerates the project's native modules (name, host type, source path). Feed the module name intocreate_cpp_class. - Create the class.
project(action="create_cpp_class", className, parentClass?, moduleName?, classDomain?, subPath?)writes.hand.cppusing the same engine template thatFile → New C++ Classuses. The class-name prefix (A,U,F) is derived fromparentClass- pass the bare name ("BotSpawner", not"ABotSpawner"). - Inspect the generated files.
project(action="read_cpp_header", headerPath=...)andproject(action="read_cpp_source", sourcePath=...). Both paths are relative toSource/or absolute within it. - Append declarations and bodies.
project(action="write_cpp_file", path=..., content=...)writes the full file contents (scoped to theSource/tree for safety). Read first, then write the amended content. - Compile.
- New UCLASS →
project(action="build"). Live Coding doesn't reliably register brand-new UCLASSes; you need a full build and an editor restart.create_cpp_classsurfaces this vianeedsEditorRestartin its response. - Existing UCLASS (editing method bodies, adding UPROPERTYs, etc.) →
project(action="live_coding_compile", wait=true). Hot-patches method bodies without restart - the fast inner loop. Checklive_coding_statusfirst to confirm Live Coding is available and not already compiling.
- New UCLASS →
Adding module dependencies
When you need a new module in a project's Build.cs:
project(action="add_module_dependency", moduleName=<target Build.cs>, dependency=<module to add>, access="public"|"private")- Deduplicates automatically. Creates the
AddRangeblock if missing. - Rebuild afterwards (
project(action="build")).
What ships with it
1 file 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.
- 5d ago First seen · 51 lines · 83 tokens per session scan A 40abe38dceda
ue-mcp-native-cpp is a skill published in the GitHub repository db-lyon/ue-mcp (304 stars, last pushed today), licensed MIT. It adds 83 tokens to every session and 977 once invoked, about $0.0004 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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