arcgis-custom-rendering

Create custom layer types by extending BaseLayerView2D/3D with WebGL rendering, custom tile layers, and blend layers. Use for advanced visualizations and custom data sources.

Quality

62%

Does it follow best practices?

Impact

—

No eval scenarios have been run

Securityby

Advisory

Suggest reviewing before use

Optimize this skill with Tessl

npx tessl skill review --optimize ./contexts/4.34/skills/arcgis-custom-rendering/SKILL.md

Quality

Content

64%

Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.

This skill provides comprehensive, executable code examples for ArcGIS custom rendering covering multiple layer types and WebGL patterns. Its main weaknesses are verbosity through code repetition (TintLayer appears twice), lack of workflow guidance for the development process, and a monolithic structure that could benefit from progressive disclosure. The actionability is strong but the content could be significantly tightened.

Suggestions

Remove the duplicate TintLayer code—keep either the standalone version or the complete HTML example, not both

Add a brief workflow section at the top outlining the steps to create a custom layer (choose base class → implement required methods → test → debug common issues)

Split detailed examples (LERC decoding, WebGL shaders, 3D RenderNode) into separate reference files and link from a concise overview

Add validation/debugging guidance—e.g., how to verify tiles are loading correctly, how to check WebGL context errors

Dimension	Reasoning	Score
Conciseness	The skill is quite long (~400 lines) with significant code repetition—the TintLayer example appears twice (once standalone, once in the complete HTML example). The LayerView architecture section repeats WebGL patterns already shown earlier. Some comments are unnecessary for Claude (e.g., '// Create canvas for processing'). However, it avoids explaining basic concepts.	2 / 3
Actionability	The code examples are concrete, executable, and copy-paste ready. Each custom layer type (TileLayer, DynamicLayer, ElevationLayer, BlendLayer, WebGL) has complete working code with proper imports. The complete HTML example is fully runnable. Specific API methods and properties are documented.	3 / 3
Workflow Clarity	The skill presents individual code patterns but lacks a clear workflow for creating custom layers from scratch. There are no validation steps, no guidance on debugging WebGL issues, and no sequenced process for going from concept to working custom layer. The Common Pitfalls section hints at issues but doesn't integrate into a workflow.	2 / 3
Progressive Disclosure	The content is a monolithic document with all examples inline. The reference samples section at the end points to external examples but isn't well-signaled throughout. The LayerView architecture section, LERC decoding, and complete HTML example could be split into separate reference files. The document would benefit from a concise overview with links to detailed sections.	2 / 3
	Total	9 / 12 Passed

Description

60%

Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.

The description does a good job listing specific technical capabilities like BaseLayerView2D/3D extension and WebGL rendering, but it lacks context about which framework/platform this applies to (likely ArcGIS JS API). The 'when' clause is too vague ('advanced visualizations and custom data sources') and doesn't provide natural trigger terms users would actually use when requesting help.

Suggestions

Specify the framework/platform (e.g., 'ArcGIS Maps SDK for JavaScript') to improve distinctiveness and trigger matching.

Expand the 'Use when...' clause with concrete trigger scenarios, e.g., 'Use when the user needs to create custom map layers, implement WebGL-based map rendering, build custom tile sources, or extend ArcGIS layer views.'

Add natural user-facing terms alongside technical ones, such as 'custom map layer', 'GIS visualization', 'map rendering', or 'spatial data rendering'.

Dimension	Reasoning	Score
Specificity	Lists multiple specific concrete actions: extending BaseLayerView2D/3D, WebGL rendering, custom tile layers, and blend layers. These are concrete, identifiable capabilities.	3 / 3
Completeness	The 'what' is well-covered (create custom layer types with specific technologies), but the 'when' clause ('Use for advanced visualizations and custom data sources') is vague and doesn't provide explicit trigger guidance. It lacks specific scenarios or user phrases that would trigger selection.	2 / 3
Trigger Term Quality	Includes some relevant technical keywords like 'WebGL rendering', 'custom tile layers', 'blend layers', 'BaseLayerView2D/3D', but these are fairly specialized jargon. Missing more natural user terms like 'ArcGIS', 'Esri', 'map layer', 'custom map rendering', or 'JavaScript API' that users would commonly say.	2 / 3
Distinctiveness Conflict Risk	The mention of BaseLayerView2D/3D and blend layers is fairly distinctive to ArcGIS JS API, but without naming the framework explicitly, it could overlap with other WebGL or mapping visualization skills. 'Advanced visualizations' is also quite broad.	2 / 3
	Total	9 / 12 Passed

Validation

90%

Warnings & errors only

Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.

Validation — 10 / 11 Passed

Validation for skill structure

Criteria	Description	Result
skill_md_line_count	SKILL.md is long (601 lines); consider splitting into references/ and linking	Warning

	Total	10 / 11 Passed

Repository: SaschaBrunnerCH/arcgis-maps-sdk-js-ai-context
Commit: d84407b

Reviewed: 2 months ago

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