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-3d-tilesgit 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-3d-tiles)<a href="https://agentmods.dev/skills/cesiumgs/cesiumjs-skills/cesiumjs-3d-tiles"><img src="https://agentmods.dev/badge/skills/cesiumgs/cesiumjs-skills/cesiumjs-3d-tiles/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-3d-tiles"><img src="https://agentmods.dev/badge/skills/cesiumgs/cesiumjs-skills/cesiumjs-3d-tiles.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 | $0.00100 | $0.04180 |
| Opus 5 | $0.00050 | $0.02090 |
| Sonnet 5 | $0.00020 | $0.00836 |
| Haiku 4.5 | $0.00010 | $0.00418 |
Grade A, and why
cesiumjs-3d-tiles 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 13d 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 — 471 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CesiumJS 3D Tiles
Version baseline: CesiumJS v1.143 (ES module imports, async factory methods).
Loading a Tileset
Always use async factory methods -- never call the constructor directly.
import { Cesium3DTileset, HeadingPitchRange, Math as CesiumMath } from "cesium";
// From a URL
const tileset = await Cesium3DTileset.fromUrl(
"https://example.com/tileset.json",
{ maximumScreenSpaceError: 16 }, // lower = higher quality
);
viewer.scene.primitives.add(tileset);
viewer.zoomTo(tileset, new HeadingPitchRange(
0.0, CesiumMath.toRadians(-25.0), tileset.boundingSphere.radius * 2.0,
));
CesiumJS 1.143 applies standalone model loading to glTF embedded in tilesets.
Read the glTF compatibility matrix
for automatic KHR_meshopt_compression, CAD extension behavior, and the unsupported planar-fill boundary.
// From Cesium ion
const tileset = await Cesium3DTileset.fromIonAssetId(75343);
viewer.scene.primitives.add(tileset);
// Google Photorealistic 3D Tiles
import { createGooglePhotorealistic3DTileset } from "cesium";
const google3D = await createGooglePhotorealistic3DTileset({
onlyUsingWithGoogleGeocoder: true,
});
viewer.scene.primitives.add(google3D);
// OSM Buildings
import { createOsmBuildingsAsync } from "cesium";
const osmBuildings = await createOsmBuildingsAsync();
viewer.scene.primitives.add(osmBuildings);
Key Constructor Options
| Option | Default | Purpose |
|---|---|---|
maximumScreenSpaceError |
16 | LOD quality threshold (pixels) |
cacheBytes |
536870912 | Tile cache trim target (bytes) |
maximumCacheOverflowBytes |
536870912 | Extra cache headroom |
shadows |
ShadowMode.ENABLED | Shadow casting/receiving |
modelMatrix |
Matrix4.IDENTITY | Root transform |
clippingPlanes |
undefined | ClippingPlaneCollection |
clippingPolygons |
undefined | ClippingPolygonCollection (WebGL 2) |
enableCollision |
false | Camera collision with tileset surface |
pointCloudShading |
undefined | Point attenuation options object |
classificationType |
undefined | TERRAIN, CESIUM_3D_TILE, or BOTH |
dynamicScreenSpaceError |
true | Horizon LOD optimization |
foveatedScreenSpaceError |
true | Center-screen tile priority |
preloadFlightDestinations |
true | Prefetch tiles at flight target |
featureIdLabel |
"featureId_0" | EXT_mesh_features ID set label |
backFaceCulling |
true | Cull back faces per glTF material |
edgeDisplayMode |
EdgeDisplayMode.SURFACES_ONLY | Render glTF edge-visibility data when present |
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.
- 13d ago First seen · 471 lines · 100 tokens per session scan A 3c6b34d14fa0
cesiumjs-3d-tiles is a skill published in the GitHub repository CesiumGS/cesiumjs-skills (174 stars, last pushed 16d ago), licensed Apache-2.0. It adds 100 tokens to every session and 4,180 once invoked, about $0.0005 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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