extension-assets

name	extension-assets
description	Generate and manage all Chrome extension assets: icons (16–128px), CWS listing images, promotional tiles, and public/ folder setup. Supports ImageMagick, Gemini API, and manual prompt templates.

Extension Assets (Icon & Image Generator)

Generate all required icons and assets for a Chrome extension and CWS listing. Do NOT just explain — execute the workflow.

Assets Checklist

Extension Icons (required)

File	Size	Usage
icon16.png	16x16	Favicon, context menus
icon32.png	32x32	Windows taskbar
icon48.png	48x48	Extensions management page
icon128.png	128x128	Installation dialog, CWS store icon

Action Icons (toolbar)

File	Size
action16.png	16x16
action24.png	24x24
action32.png	32x32

CWS Listing Assets

Asset	Size	Required?
Screenshots	1280x800 or 640x400	Yes (1–5)
Small promo tile	440x280	For featured placement
Large promo tile	920x680	Optional
Marquee promo tile	1400x560	Optional

Workflow (Execute This)

Step 1: Generate or locate source icon

Ask user: "Do you have a source logo? (SVG or PNG, min 512x512)"

If no source — generate SVG directly: Create a clean, professional SVG icon. Design should be:

• Simple geometric shapes (recognizable at 16x16)
• Flat design, no gradients (clean at all sizes)
• Natural, hand-crafted look (NOT AI-generated style)
• 2-3 colors max, bold contrast

Save as icon.svg in project root.

Step 2: Convert SVG → PNG (Node.js script)

npm install -D sharp
node scripts/generate-icons.js

See references/icon-converter-script.md for the full Node.js script using sharp.

Fallback (ImageMagick):

for size in 16 32 48 128; do
  convert -background none -resize ${size}x${size} icon.svg "public/icons/icon${size}.png"
done

Step 3: Generate placeholder CWS assets

# Screenshot placeholder (1280x800)
convert -size 1280x800 xc:"#f8f9fa" \
  -font DejaVu-Sans -pointsize 48 -fill "#6c757d" \
  -gravity center -annotate 0 "Screenshot Placeholder\n1280x800" \
  public/store/screenshot1.png

# Small promo tile (440x280)
convert -size 440x280 xc:"#4285f4" \
  -font DejaVu-Sans -pointsize 32 -fill white \
  -gravity center -annotate 0 "Extension Name\nChrome Web Store" \
  public/store/promo-small.png

Step 4: Gemini API generation (optional)

Check for API key:

echo $GEMINI_API_KEY

If set, use ai-multimodal skill or call Gemini API directly. See references/image-generation-prompts.md for prompt templates.

If not set, output prompts from references/image-generation-prompts.md for user to generate manually.

Step 5: Set up public/ folder

Follow structure in references/public-folder-setup.md. Verify manifest.json icon paths match.

Step 6: Validate assets

# Check all required icons exist and are correct size
for size in 16 32 48 128; do
  identify public/icons/icon${size}.png | grep "${size}x${size}" \
    && echo "icon${size}.png OK" || echo "icon${size}.png MISSING/WRONG SIZE"
done

Output Format

## Assets Generation Report: <extension-name>

### Generated Icons
- icon16.png ✓ | icon32.png ✓ | icon48.png ✓ | icon128.png ✓
- action16.png ✓ | action24.png ✓ | action32.png ✓

### CWS Listing Assets
- screenshot1.png (1280x800) ✓
- promo-small.png (440x280) ✓

### Pending (manual generation needed)
- Large promo tile (920x680) — prompt provided below
- Screenshots with real extension UI

### Prompts for Manual Generation
<see references/image-generation-prompts.md>

References

• references/icon-requirements.md — Icon specs, manifest config, design guidelines
• references/icon-converter-script.md — Node.js script (sharp) to convert SVG → multi-size PNG
• references/store-listing-assets.md — CWS listing requirements and best practices
• references/image-generation-prompts.md — AI prompt templates, Gemini API setup
• references/public-folder-setup.md — public/ folder structure and manifest paths
• Chrome Extension Icons
• CWS Best Listing

Related Skills

• extension-create — Scaffold new extension with public/ folder
• extension-manifest — Generate/validate manifest.json icon paths
• extension-publish — Store submission checklist