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cesium-agents-skill-validator

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UpdatedMay 20, 2026 at 07:44

Use when CesiumJS code has just been generated or reviewed and must be checked before it is called done, to catch deprecated APIs and common defects, or when auditing CesiumJS code from an older source. Detects the removed synchronous patterns (readyPromise, the url constructor option, ModelExperimental, defaultValue, new on a Cartesian factory), WebGPU assumptions, missing ion tokens, missing destroy() calls, and coordinate-type mistakes. Runs a deterministic checklist and routes each failure to the skill that fixes it. Keywords: validate CesiumJS code, review Cesium code, is this Cesium code correct, deprecated CesiumJS API, readyPromise, ModelExperimental, defaultValue removed, check before commit, CesiumJS code quality, lint Cesium, did I use the right API, audit Cesium scene, why might this code fail.

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SKILL.md

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name	cesium-agents-skill-validator
description	Use when CesiumJS code has just been generated or reviewed and must be checked before it is called done, to catch deprecated APIs and common defects, or when auditing CesiumJS code from an older source. Detects the removed synchronous patterns (readyPromise, the url constructor option, ModelExperimental, defaultValue, new on a Cartesian factory), WebGPU assumptions, missing ion tokens, missing destroy() calls, and coordinate-type mistakes. Runs a deterministic checklist and routes each failure to the skill that fixes it. Keywords: validate CesiumJS code, review Cesium code, is this Cesium code correct, deprecated CesiumJS API, readyPromise, ModelExperimental, defaultValue removed, check before commit, CesiumJS code quality, lint Cesium, did I use the right API, audit Cesium scene, why might this code fail.
license	MIT
compatibility	Designed for Claude Code. Requires CesiumJS 1.124+.
metadata	{"author":"OpenAEC-Foundation","version":"1.0"}

Cesium Agents : Skill Validator

Overview

This is a validation skill. Run it over any CesiumJS code before declaring it finished. It is a deterministic checklist: each check has a grep-style trigger, a verdict, and the skill that holds the fix. The checklist targets CesiumJS 1.124+, where a large set of pre-2023 APIs no longer exist.

CesiumJS 1.124+ is WebGL2 only. Any code that names or assumes WebGL is fine; any code that names or assumes WebGPU for CesiumJS is wrong.

When to Use

A CesiumJS snippet was just generated and is about to be presented or committed.
Reviewing CesiumJS code from an older tutorial, blog post, or Sandcastle.
A scene "should work" but renders blank, throws, or leaks, and a structured pass is needed.

Check 1 : Removed Async-Era APIs (BLOCKER)

Each token below was removed before or within the 1.124 to 1.142 window. Any match is a hard failure. Verdict: REJECT until fixed.

Found token	Status	Required replacement	Fix skill
`new Cesium3DTileset(`	removed 1.107	`await Cesium3DTileset.fromUrl(url)` / `.fromIonAssetId(id)`	`cesium-syntax-3d-tiles`
`.readyPromise`	removed 1.107	`await` the async factory	`cesium-core-versioning`
`.ready` on a tileset/model/provider	removed 1.107	the awaited result is ready	`cesium-core-versioning`
`Model.fromGltf(` (without `Async`)	removed	`Model.fromGltfAsync(`	`cesium-syntax-gltf-model`
`ModelExperimental`	removed (merged into `Model`)	`Model`	`cesium-syntax-gltf-model`
`new CesiumTerrainProvider({`	removed 1.107	`await CesiumTerrainProvider.fromUrl(url)`	`cesium-syntax-terrain`
`createWorldTerrain(` (without `Async`)	removed 1.107	`createWorldTerrainAsync(`	`cesium-syntax-terrain`
`defaultValue(`	removed 1.134	`a ?? b`	`cesium-core-versioning`
`new Cesium.Cartesian3.fromDegrees`	throws since 1.139	drop `new`	`cesium-core-coordinates`
`terrainExaggeration` on `Globe`	removed 1.113	`scene.verticalExaggeration`	`cesium-core-versioning`

Check 2 : WebGPU Assumption (BLOCKER)

Trigger: any reference to a WebGPU backend, context, or toggle for CesiumJS.
Verdict: REJECT. CesiumJS renders only on WebGL2 in 1.124+.
Fix skill: cesium-core-architecture.

Check 3 : Missing ion Token (BLOCKER if ion used)

Trigger: code uses fromIonAssetId, IonImageryProvider, world imagery, world terrain, or OSM Buildings, but never sets Ion.defaultAccessToken.
Verdict: REJECT. The scene will 401 and the globe will be blank.
Fix skill: cesium-syntax-viewer, cesium-impl-cesium-ion.

Check 4 : Async Factory Not Awaited (BLOCKER)

Trigger: a from* factory (fromUrl, fromIonAssetId, fromGltfAsync, fromProviderAsync) whose result is used without await.
Verdict: REJECT. The variable holds a Promise, not the object; scene.primitives.add and property access fail.
Fix skill: cesium-core-versioning, cesium-syntax-3d-tiles.

Check 5 : Missing Teardown (WARN)

Trigger: a Viewer, Cesium3DTileset, Model, custom Primitive, or ScreenSpaceEventHandler is created with no destroy() on any cleanup path; or an addEventListener on a CesiumJS Event with no stored remover.
Verdict: WARN. Acceptable for a one-shot script, a defect for an app.
Fix skill: cesium-core-memory, cesium-errors-memory.

Check 6 : Coordinate Type and Unit (BLOCKER)

Trigger: new Cartographic( with degree-magnitude numbers; a Cartographic assigned to entity.position; a factory called as (latitude, longitude); degrees passed to new HeadingPitchRoll.
Verdict: REJECT. The geometry will be misplaced or absent.
Fix skill: cesium-errors-coordinates, cesium-core-coordinates.

Check 7 : API Name Verification (BLOCKER)

Trigger: any CesiumJS class, method, or enum value not confirmed against the API reference.
Verdict: REJECT until verified. Hallucinated API names are the highest-risk defect in generated code.
Action: WebFetch the name against https://cesium.com/learn/cesiumjs/ref-doc/ (the SOURCES.md primary source). If it does not exist, the code is wrong.

Check 8 : Continuous Render on a Static Scene (WARN)

Trigger: a static or rarely-changing scene with no requestRenderMode: true.
Verdict: WARN. Not a defect, but a battery and GPU cost.
Fix skill: cesium-core-performance.

Verdict Rule

Any BLOCKER unresolved : REJECT the code. Do not present it as done.
Only WARN items : ACCEPT with the warnings stated to the user.
All checks clear : ACCEPT.

NEVER report CesiumJS code as complete while a Check 1 to 4, 6, or 7 failure stands.

Quick Scan Order

Run Check 1, 2, 3, 4 first; they are the fastest to grep and the most common. Then Check 6 and 7. Check 5 and 8 last; they are WARN-level.

Reference Files

references/methods.md : every check as a grep-ready pattern with verdict and fix skill.
references/examples.md : worked validations of three code snippets, one rejected and rewritten, one warned, one accepted.
references/anti-patterns.md : the failure modes of validation itself, such as trusting a plausible but hallucinated API name.

Related Skills

cesium-core-versioning : the full removed-API migration detail.
cesium-core-architecture : the WebGL2-only fact.
cesium-errors-coordinates : coordinate type and unit failures.
cesium-core-memory : teardown requirements.
cesium-agents-scene-architect : the setup decisions this validator checks.

Sources

Built on the project research base (docs/research/vooronderzoek-cesium.md) and the verified CHANGES.md matrix, against the CesiumJS API Reference on the approved sources, 2026-05-20.

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Use when starting a new CesiumJS application or feature and deciding how to structure the scene: which viewer class, which imagery and terrain, how to represent a dataset, and whether to enable on-demand rendering. Prevents the wrong-API-tier choice (Entity where 3D Tiles is needed, or the reverse), the continuous-render battery drain, and missing-token blank globes. Orchestrates the CesiumJS skill set into one setup decision path. Keywords: CesiumJS architecture, how do I structure a Cesium app, which viewer, Viewer or CesiumWidget, Entity or Primitive or 3D Tiles, choose imagery provider, choose terrain provider, requestRenderMode, scene setup decision, how do I display my data in Cesium, what API should I use, getting started Cesium scene, plan a Cesium scene.

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cesium-errors-coordinates

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Use when CesiumJS geometry renders in the wrong place, falls through the terrain, sits at the center of the Earth, or never appears, and when position values come back as NaN. Prevents the radians-versus-degrees mistake, the Cartographic-versus-Cartesian3 mixup, the longitude and latitude swap, the GeoJSON ground-clamp surprise, and terrain-clamping before terrain has loaded. Covers Cartesian3, Cartographic, the fromDegrees factories, HeightReference, HeadingPitchRoll conventions, and terrain height sampling. Keywords: CesiumJS coordinates, NaN position, entity not showing, model wrong place, geometry at center of earth, off the globe, radians degrees, longitude latitude swapped, Cartographic Cartesian3, fromDegrees, fromRadians, clampToGround, sampleTerrainMostDetailed, HeightReference, HeadingPitchRoll, heading pitch roll wrong, why is my point underground, how do I place something on terrain, position is NaN.

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Use when a CesiumJS app's memory keeps growing, the browser tab slows down or crashes after running a while, or the console reports "Too many active WebGL contexts" or "DeveloperError: This object was destroyed". Covers WebGL resource leaks from missing destroy() calls, teardown ordering, reusing primitives after destruction, entity-removal memory retention, lost-reference bugs that only look like leaks, and exhaustion of the browser 16-context WebGL budget by single-page-app routing or React re-mounts. Keywords: memory leak, heap grows, tab crash, out of memory, browser freezes, app slow over time, WebGL context lost, too many active WebGL contexts, This object was destroyed, DeveloperError, destroy, isDestroyed, PrimitiveCollection, destroyPrimitives, viewer.destroy, how do I clean up a Cesium viewer, why does my Cesium app leak memory.

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Use when a CesiumJS globe renders blank, black, white, or frozen, when the canvas shows nothing, when the WebGL context is lost, or when a render-loop error panel covers the canvas. Prevents the blank-globe trap caused by an unset CESIUM_BASE_URL, a missing or invalid Cesium ion token, or an omitted bundler asset-copy step. Covers the renderError event, WebGL context-loss recovery, the 16-context budget, and missing imagery or terrain. Keywords: blank globe, black screen, white screen, nothing renders, globe not showing, CESIUM_BASE_URL, CONTEXT_LOST_WEBGL, renderError, rethrowRenderErrors, Ion.defaultAccessToken, HTTP 401, webglcontextlost, too many active WebGL contexts, no imagery, no terrain, how do I fix a blank Cesium globe.

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name	cesium-agents-skill-validator
description	Use when CesiumJS code has just been generated or reviewed and must be checked before it is called done, to catch deprecated APIs and common defects, or when auditing CesiumJS code from an older source. Detects the removed synchronous patterns (readyPromise, the url constructor option, ModelExperimental, defaultValue, new on a Cartesian factory), WebGPU assumptions, missing ion tokens, missing destroy() calls, and coordinate-type mistakes. Runs a deterministic checklist and routes each failure to the skill that fixes it. Keywords: validate CesiumJS code, review Cesium code, is this Cesium code correct, deprecated CesiumJS API, readyPromise, ModelExperimental, defaultValue removed, check before commit, CesiumJS code quality, lint Cesium, did I use the right API, audit Cesium scene, why might this code fail.
license	MIT
compatibility	Designed for Claude Code. Requires CesiumJS 1.124+.
metadata	{"author":"OpenAEC-Foundation","version":"1.0"}

Cesium Agents : Skill Validator

Overview

CesiumJS 1.124+ is WebGL2 only. Any code that names or assumes WebGL is fine; any code that names or assumes WebGPU for CesiumJS is wrong.

When to Use

A CesiumJS snippet was just generated and is about to be presented or committed.
Reviewing CesiumJS code from an older tutorial, blog post, or Sandcastle.
A scene "should work" but renders blank, throws, or leaks, and a structured pass is needed.

Check 1 : Removed Async-Era APIs (BLOCKER)

Each token below was removed before or within the 1.124 to 1.142 window. Any match is a hard failure. Verdict: REJECT until fixed.

Found token	Status	Required replacement	Fix skill
`new Cesium3DTileset(`	removed 1.107	`await Cesium3DTileset.fromUrl(url)` / `.fromIonAssetId(id)`	`cesium-syntax-3d-tiles`
`.readyPromise`	removed 1.107	`await` the async factory	`cesium-core-versioning`
`.ready` on a tileset/model/provider	removed 1.107	the awaited result is ready	`cesium-core-versioning`
`Model.fromGltf(` (without `Async`)	removed	`Model.fromGltfAsync(`	`cesium-syntax-gltf-model`
`ModelExperimental`	removed (merged into `Model`)	`Model`	`cesium-syntax-gltf-model`
`new CesiumTerrainProvider({`	removed 1.107	`await CesiumTerrainProvider.fromUrl(url)`	`cesium-syntax-terrain`
`createWorldTerrain(` (without `Async`)	removed 1.107	`createWorldTerrainAsync(`	`cesium-syntax-terrain`
`defaultValue(`	removed 1.134	`a ?? b`	`cesium-core-versioning`
`new Cesium.Cartesian3.fromDegrees`	throws since 1.139	drop `new`	`cesium-core-coordinates`
`terrainExaggeration` on `Globe`	removed 1.113	`scene.verticalExaggeration`	`cesium-core-versioning`

Check 2 : WebGPU Assumption (BLOCKER)

Trigger: any reference to a WebGPU backend, context, or toggle for CesiumJS.
Verdict: REJECT. CesiumJS renders only on WebGL2 in 1.124+.
Fix skill: cesium-core-architecture.

Check 3 : Missing ion Token (BLOCKER if ion used)

Trigger: code uses fromIonAssetId, IonImageryProvider, world imagery, world terrain, or OSM Buildings, but never sets Ion.defaultAccessToken.
Verdict: REJECT. The scene will 401 and the globe will be blank.
Fix skill: cesium-syntax-viewer, cesium-impl-cesium-ion.

Check 4 : Async Factory Not Awaited (BLOCKER)

Trigger: a from* factory (fromUrl, fromIonAssetId, fromGltfAsync, fromProviderAsync) whose result is used without await.
Verdict: REJECT. The variable holds a Promise, not the object; scene.primitives.add and property access fail.
Fix skill: cesium-core-versioning, cesium-syntax-3d-tiles.

Check 5 : Missing Teardown (WARN)

Trigger: a Viewer, Cesium3DTileset, Model, custom Primitive, or ScreenSpaceEventHandler is created with no destroy() on any cleanup path; or an addEventListener on a CesiumJS Event with no stored remover.
Verdict: WARN. Acceptable for a one-shot script, a defect for an app.
Fix skill: cesium-core-memory, cesium-errors-memory.

Check 6 : Coordinate Type and Unit (BLOCKER)

Trigger: new Cartographic( with degree-magnitude numbers; a Cartographic assigned to entity.position; a factory called as (latitude, longitude); degrees passed to new HeadingPitchRoll.
Verdict: REJECT. The geometry will be misplaced or absent.
Fix skill: cesium-errors-coordinates, cesium-core-coordinates.

Check 7 : API Name Verification (BLOCKER)

Trigger: any CesiumJS class, method, or enum value not confirmed against the API reference.
Verdict: REJECT until verified. Hallucinated API names are the highest-risk defect in generated code.
Action: WebFetch the name against https://cesium.com/learn/cesiumjs/ref-doc/ (the SOURCES.md primary source). If it does not exist, the code is wrong.

Check 8 : Continuous Render on a Static Scene (WARN)

Trigger: a static or rarely-changing scene with no requestRenderMode: true.
Verdict: WARN. Not a defect, but a battery and GPU cost.
Fix skill: cesium-core-performance.

Verdict Rule

Any BLOCKER unresolved : REJECT the code. Do not present it as done.
Only WARN items : ACCEPT with the warnings stated to the user.
All checks clear : ACCEPT.

NEVER report CesiumJS code as complete while a Check 1 to 4, 6, or 7 failure stands.

Quick Scan Order

Run Check 1, 2, 3, 4 first; they are the fastest to grep and the most common. Then Check 6 and 7. Check 5 and 8 last; they are WARN-level.

Reference Files

references/methods.md : every check as a grep-ready pattern with verdict and fix skill.
references/examples.md : worked validations of three code snippets, one rejected and rewritten, one warned, one accepted.
references/anti-patterns.md : the failure modes of validation itself, such as trusting a plausible but hallucinated API name.

Related Skills

cesium-core-versioning : the full removed-API migration detail.
cesium-core-architecture : the WebGL2-only fact.
cesium-errors-coordinates : coordinate type and unit failures.
cesium-core-memory : teardown requirements.
cesium-agents-scene-architect : the setup decisions this validator checks.

Sources

Built on the project research base (docs/research/vooronderzoek-cesium.md) and the verified CHANGES.md matrix, against the CesiumJS API Reference on the approved sources, 2026-05-20.