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 SaschaBrunnerCH/arcgis-maps-sdk-js-ai-context --skill arcgis-layersgit clone --depth 1 https://github.com/SaschaBrunnerCH/arcgis-maps-sdk-js-ai-contextWrote 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/saschabrunnerch/arcgis-maps-sdk-js-ai-context/arcgis-layers)<a href="https://agentmods.dev/skills/saschabrunnerch/arcgis-maps-sdk-js-ai-context/arcgis-layers"><img src="https://agentmods.dev/badge/skills/saschabrunnerch/arcgis-maps-sdk-js-ai-context/arcgis-layers/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/saschabrunnerch/arcgis-maps-sdk-js-ai-context/arcgis-layers"><img src="https://agentmods.dev/badge/skills/saschabrunnerch/arcgis-maps-sdk-js-ai-context/arcgis-layers.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00045 | $0.04852 |
| Opus 5 | $0.00023 | $0.02426 |
| Sonnet 5 | $0.00009 | $0.00970 |
| Haiku 4.5 | $0.00005 | $0.00485 |
Grade A, and why
arcgis-layers 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 — 746 lines — stays where its author put it; the contents beside it link to each section on GitHub.
ArcGIS Layers
Use this skill when adding, configuring, or querying data layers in ArcGIS maps.
Import Patterns
Direct ESM Imports
import FeatureLayer from "@arcgis/core/layers/FeatureLayer.js";
import GraphicsLayer from "@arcgis/core/layers/GraphicsLayer.js";
import GeoJSONLayer from "@arcgis/core/layers/GeoJSONLayer.js";
Dynamic Imports (CDN)
const FeatureLayer = await $arcgis.import(
"@arcgis/core/layers/FeatureLayer.js",
);
const [GraphicsLayer, Graphic] = await $arcgis.import([
"@arcgis/core/layers/GraphicsLayer.js",
"@arcgis/core/Graphic.js",
]);
Layer Types Overview
| Layer Type | Use Case | Geometry |
|---|---|---|
| FeatureLayer | Most common - feature services, editable data | Points, lines, polygons |
| GraphicsLayer | Client-side temporary graphics | Any |
| GeoJSONLayer | GeoJSON files/URLs | Points, lines, polygons |
| CSVLayer | CSV files with coordinates | Points |
| TileLayer | Cached map tiles | Raster |
| VectorTileLayer | Vector tiles (Mapbox style) | Vector |
| ImageryTileLayer | Raster imagery | Raster |
| SceneLayer | 3D buildings, meshes | 3D objects |
| IntegratedMeshLayer | Photogrammetry meshes | 3D mesh |
| PointCloudLayer | LiDAR point clouds | Points |
| ParquetLayer | Apache Parquet files | Points, lines, polygons |
| StreamLayer | Real-time WebSocket data | Points, lines, polygons |
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 · 746 lines · 45 tokens per session scan A 77a7563f9359
arcgis-layers is a skill published in the GitHub repository SaschaBrunnerCH/arcgis-maps-sdk-js-ai-context (22 stars, last pushed 5mo ago), licensed MIT. It adds 45 tokens to every session and 4,852 once invoked, about $0.0002 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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