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 CesiumGS/cesiumjs-skills --skill cesiumjs-models-particlesgit clone --depth 1 https://github.com/CesiumGS/cesiumjs-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/cesiumgs/cesiumjs-skills/cesiumjs-models-particles)<a href="https://agentmods.dev/skills/cesiumgs/cesiumjs-skills/cesiumjs-models-particles"><img src="https://agentmods.dev/badge/skills/cesiumgs/cesiumjs-skills/cesiumjs-models-particles/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/cesiumgs/cesiumjs-skills/cesiumjs-models-particles"><img src="https://agentmods.dev/badge/skills/cesiumgs/cesiumjs-skills/cesiumjs-models-particles.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 | $0.00087 | $0.03916 |
| Opus 5 | $0.00044 | $0.01958 |
| Sonnet 5 | $0.00017 | $0.00783 |
| Haiku 4.5 | $0.00009 | $0.00392 |
Grade A, and why
cesiumjs-models-particles 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 — 431 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CesiumJS Models, glTF & Particle Effects
Version baseline: CesiumJS v1.143.
Quick Reference
| Class | Purpose |
|---|---|
Model |
Low-level glTF/GLB primitive; positioned via modelMatrix |
ModelAnimation |
Active animation instance on a model |
ModelAnimationCollection |
Collection at model.activeAnimations |
ModelNode |
Named node with modifiable transform |
ModelFeature |
Per-feature styling/picking for feature-ID models |
EdgeDisplayMode |
Controls draft glTF edge-visibility rendering on Model/Cesium3DTileset |
ParticleSystem |
Billboard-based particle manager (fire, smoke, rain) |
Particle |
Single particle with position, velocity, life |
ParticleBurst |
Scheduled burst of particles |
BoxEmitter / CircleEmitter |
Emit within box volume / flat disk |
ConeEmitter / SphereEmitter |
Emit from cone tip / within sphere |
The Entity API exposes models through ModelGraphics (see cesiumjs-entities). The Primitive API uses Model.fromGltfAsync for full control over modelMatrix, animations, and node transforms.
Loading a glTF/GLB Model
Always use the async factory -- never call the constructor directly.
import { Model, Cartesian3, Transforms, HeadingPitchRoll, Math as CesiumMath } from "cesium";
const model = await Model.fromGltfAsync({ url: "path/to/model.glb" });
viewer.scene.primitives.add(model);
CesiumJS 1.143 decodes KHR_meshopt_compression automatically, including the
v1 attribute codec and COLOR filter. Do not import a decoder or private loader
helper. When loading compressed glTF, CAD-style lines/points/edges, or
constant-LOD textures, read REFERENCE.md for the complete
support and authoring matrix. The same loader behavior applies to glTF content
inside 3D Tiles.
Positioned Model with Heading
const position = Cartesian3.fromDegrees(-123.074, 44.050, 5000);
const hpr = new HeadingPitchRoll(CesiumMath.toRadians(135), 0, 0);
const model = await Model.fromGltfAsync({
url: "CesiumAir.glb",
modelMatrix: Transforms.headingPitchRollToFixedFrame(position, hpr),
minimumPixelSize: 128, // never smaller than 128 px on screen
maximumScale: 20000, // cap for minimumPixelSize enlargement
scale: 2.0, // uniform scale multiplier
});
viewer.scene.primitives.add(model);
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.
- 11d ago First seen · 431 lines · 87 tokens per session scan A bc9f0f62e1fb
cesiumjs-models-particles is a skill published in the GitHub repository CesiumGS/cesiumjs-skills (173 stars, last pushed 14d ago), licensed Apache-2.0. It adds 87 tokens to every session and 3,916 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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