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 kevinpbuckley/VibeUE --skill niagara-emittersgit clone --depth 1 https://github.com/kevinpbuckley/VibeUEWrote 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/kevinpbuckley/vibeue/niagara-emitters)<a href="https://agentmods.dev/skills/kevinpbuckley/vibeue/niagara-emitters"><img src="https://agentmods.dev/badge/skills/kevinpbuckley/vibeue/niagara-emitters/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/kevinpbuckley/vibeue/niagara-emitters"><img src="https://agentmods.dev/badge/skills/kevinpbuckley/vibeue/niagara-emitters.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 | $0.00111 | $0.02096 |
| Opus 5 | $0.00056 | $0.01048 |
| Sonnet 5 | $0.00022 | $0.00419 |
| Haiku 4.5 | $0.00011 | $0.00210 |
Grade A, and why
niagara-emitters 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 11d 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 — 172 lines — stays where its author put it; the contents beside it link to each section on GitHub.
🧠 Brains complement: IF an
unreal-engine-skills-managertool (external MCP) exists in this session, call it with{action: "load", skill: "niagara-vfx"}for UE domain knowledge on this topic — correct APIs, architecture, best practices — and treat it as the rubric for any review / "best practices" question. If no such tool is available (e.g. running under Claude Code or Codex without that MCP), skip this line entirely and proceed with this skill alone — do NOT attempt the call.
Niagara Emitters Skill
Architecture (read first): VibeUE extends Unreal's native MCP endpoint. Emitter module and renderer CRUD (add/remove/enable/reorder modules, add/remove renderers, set module/renderer inputs, search module scripts) are owned by the engine
NiagaraToolsets.*toolsets, called throughcall_tool. VibeUE'sNiagaraEmitterServicewas trimmed to the color/curve authoring the engine doesn't provide, plus a rapid-iteration-parameter reader.
VibeUE NiagaraEmitterService (this skill) keeps ONLY color/curve authoring + a param reader:
set_color_tint— add/set a ScaleColor tint (handles ColorFromCurve automatically)get_color_curve_keys/set_color_curve_keys— read/replace ColorFromCurve keyframesshift_color_hue— hue-rotate a ColorFromCurve while preserving detail (best for recolors)get_rapid_iteration_parameters— read an emitter's rapid-iteration params
NiagaraScratchPadService authors scratch-pad module graphs:
- Create empty scratch modules on any stage
- Drop Map Get / Map Set / Op / Custom HLSL nodes
- Add typed pins, connect pins, declare module inputs/outputs
- Apply + recompile in one call
For module / renderer CRUD → engine NiagaraToolsets.* via call_tool (discover with
list_toolsets / describe_toolset). For system-level operations (create system, add emitters,
user params, compile) → engine NiagaraToolsets.* and the niagara-systems skill. Rapid-iteration
param writes (set_rapid_iteration_param*) live on NiagaraService (niagara-systems skill).
Loading skills: skills load through the engine's
AgentSkillToolset(ListSkills/GetSkills) — there is novibeue-skills-managertool. Run VibeUE services withexecute_python_code(unreal.<Service>.<method>()); reach engine toolsets withcall_tool.
What ships with it
5 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.
- 11d ago First seen · 172 lines · 111 tokens per session scan A 7e0e8e82f986
niagara-emitters is a skill published in the GitHub repository kevinpbuckley/VibeUE (674 stars, last pushed 7d ago), licensed MIT. It adds 111 tokens to every session and 2,096 once invoked, about $0.0006 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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