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maps-utils-android

Guide for integrating the Google Maps Utility Library for Android (android-maps-utils) into an application. Use when users ask to add features like Marker Clustering, Heatmaps, GeoJSON, KML, or Polyline encoding/decoding.

Quality

81%

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SKILL.md
Quality
Evals
Security

Quality

Content

65%Weight 40%Scale 1-5

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

A compact, well-structured integration guide with real API names and a working dependency snippet, held back by unnecessary persona/concept padding, release-tooling noise in the code block, and a lack of validation checkpoints or prerequisite guidance (base Maps SDK setup, API key). The clustering section would benefit from one complete executable example.

Suggestions

Drop the persona sentence and the 'Used to...' concept explanations (Claude knows what clustering and heatmaps are), and remove the '// x-release-please-version' comment; this would tighten conciseness to the top band.

Add one complete, copy-paste-ready clustering example (ClusterItem data class + ClusterManager initialization in onMapReady + listener wiring) since it is the headline feature but currently only has high-level steps.

Add brief validation checkpoints: verifying the base Google Maps SDK dependency and API key are configured before using Utility Library features, and confirming the overlay/layer renders after addLayerToMap().

DimensionReasoningScore

Conciseness

Mostly efficient but includes unnecessary elements: the persona sentence 'You are an expert Android developer specializing in...', concept explanations Claude already knows ('Used to manage multiple markers at different zoom levels', 'Used to represent the density of data points'), the pinned version '6.1.0' with release-tooling noise '// x-release-please-version'. Not a 4 because these add up to more than minor over-explanation; not a 2 because the body is short and mostly API-focused.

3 / 5

Actionability

Provides mostly executable guidance with real API calls: 'HeatmapTileProvider.Builder().data(list).build()', 'val layer = GeoJsonLayer(map, R.raw.geojson_file, context); layer.addLayerToMap()', 'PolyUtil.decode(encodedPathString)', and a complete gradle dependency snippet. Not a 5 because the flagship clustering feature lacks a complete executable example (no code for ClusterItem/ClusterManager wiring, no imports); not a 3 because the guidance uses real class/method names rather than pseudocode.

4 / 5

Workflow Clarity

Steps are listed and sequenced per feature (clustering steps 1-4, heatmap steps 1-3), but there are no validation checkpoints at all — nothing about verifying overlays render, base Google Maps SDK/API-key prerequisites, or build verification. Matches anchor 3 ('steps listed but checkpoints missing or implicit'); not a 4 because most checkpoints are absent, though the operations are non-destructive so the destructive cap is irrelevant.

3 / 5

Progressive Disclosure

The body is under 50 lines, has no bundle files, and needs no external references; content is well-organized into 'Setup Dependencies', per-feature subsections, and 'Best Practices'. Per the simple-skill scoring note, well-organized sections alone qualify for the top anchor.

5 / 5

Total

15

/

20

Passed

Description

87%Weight 40%Scale 1-5

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

A strong description: third-person voice, explicit 'Use when...' trigger clause with concrete feature keywords, and a clearly named niche library. Minor room to add synonyms (e.g., '.kml', 'clustering markers') and secondary capabilities like spherical geometry or custom cluster renderers.

DimensionReasoningScore

Specificity

Names the domain ('integrating the Google Maps Utility Library for Android (android-maps-utils)') and lists several concrete capabilities ('Marker Clustering, Heatmaps, GeoJSON, KML, or Polyline encoding/decoding'), with minor gaps such as custom renderers and spherical geometry utilities. Not a 5 because coverage is not comprehensive; not a 3 because it goes well beyond 1-2 actions.

4 / 5

Completeness

Clearly answers both 'what' ('Guide for integrating the Google Maps Utility Library for Android... into an application') and 'when' with concrete trigger phrases ('Use when users ask to add features like Marker Clustering, Heatmaps, GeoJSON, KML, or Polyline encoding/decoding'). This matches the anchor-5 example pattern exactly.

5 / 5

Trigger Term Quality

Includes natural phrases users would actually say when requesting this skill ('Marker Clustering', 'Heatmaps', 'GeoJSON', 'KML', 'Polyline encoding/decoding') plus the library name itself. Not a 5 because common synonyms and file extensions (e.g., '.kml', 'cluster markers together') are missing.

4 / 5

Distinctiveness Conflict Risk

The specific library name 'android-maps-utils' plus named features give it a clear niche with distinct triggers and minimal conflict risk; only very slight overlap with a hypothetical generic Google Maps skill. Not a 4 because the utility-library scope is well differentiated from the base Maps SDK.

5 / 5

Total

18

/

20

Passed

Validation

100%

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

Validation — 16 / 16 Passed

Validation for skill structure

No warnings or errors.

Repository

googlemaps/android-maps-utils

Path

.gemini/skills/android-maps-utils/SKILL.md

Reviewed

Table of Contents

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