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 db-lyon/ue-mcp --skill ue-mcp-niagaragit 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-niagara)<a href="https://agentmods.dev/skills/db-lyon/ue-mcp/ue-mcp-niagara"><img src="https://agentmods.dev/badge/skills/db-lyon/ue-mcp/ue-mcp-niagara/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/db-lyon/ue-mcp/ue-mcp-niagara"><img src="https://agentmods.dev/badge/skills/db-lyon/ue-mcp/ue-mcp-niagara.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00071 | $0.01082 |
| Opus 5 | $0.00036 | $0.00541 |
| Sonnet 5 | $0.00014 | $0.00216 |
| Haiku 4.5 | $0.00007 | $0.00108 |
Grade A, and why
ue-mcp-niagara 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 12d 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 — 54 lines — stays where its author put it; the contents beside it link to each section on GitHub.
ue-mcp Niagara authoring
The niagara tool covers systems, emitters, modules, renderers, and HLSL authoring.
Create and inspect
niagara(action="create", name, packagePath?)- stand up a blankUNiagaraSystem.niagara(action="create_system_from_spec", name, packagePath?, emitters=[{path}])- declaratively create a system with emitters in one call.niagara(action="list_emitters", systemPath)/niagara(action="get_info", assetPath)- inspect shape.niagara(action="inspect_data_interfaces", systemPath)- enumerate user-scope data interfaces.niagara(action="list_system_parameters", systemPath)- user-exposed parameters (with isDataInterface flag).
Renderers
niagara(action="list_renderers", systemPath, emitterName?)- current renderer stack.niagara(action="add_renderer", systemPath, rendererType="sprite"|"mesh"|"ribbon", emitterName?)- or pass a full class name.niagara(action="set_renderer_property", systemPath, rendererIndex, propertyName, value, emitterName?)- bool / numeric / string properties via reflection.niagara(action="remove_renderer", systemPath, rendererIndex, emitterName?).
Module inputs + static switches (v0.7.14)
niagara(action="list_module_inputs", systemPath, emitterName?, stackContext?)- walks every module in the ParticleSpawn / ParticleUpdate / EmitterSpawn / EmitterUpdate script stacks, reports input + output pins (name, type, default, linked-state).niagara(action="set_module_input", systemPath, moduleName, inputName, value, emitterName?, stackContext?)- writes a literal default on the module's function-call input pin. Limitation: inputs already overridden via the stack editor's override-map node aren't touched by this path. Clear the override in-editor if the write doesn't take effect.niagara(action="list_static_switches", systemPath, moduleName?, emitterName?, stackContext?)- usesUNiagaraGraph::FindStaticSwitchInputson each module's function script, cross-referenced against pins on the calling node.niagara(action="set_static_switch", systemPath, moduleName, switchName, value, emitterName?, stackContext?)- format thevalueper the switch type:"true"/"false"for bool, integer literal for int/byte/enum.
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.
- 12d ago First seen · 54 lines · 71 tokens per session scan A 4f2be6059f26
ue-mcp-niagara is a skill published in the GitHub repository db-lyon/ue-mcp (328 stars, last pushed today), licensed MIT. It adds 71 tokens to every session and 1,082 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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