SKILL.md - YouTube Thumbnail Generator

Generate YouTube thumbnails from approved portrait assets, HTML templates, and the project brand guidelines.

Assets Location

• Approved portraits: $THUMBNAIL_PHOTO_DIR
• closeup.jpg - Close-up face shot, best for thumbnails
• speaking.jpg - Speaking/presenting pose
• frame-01.jpg - source video frame
• frame-02.jpg - source video frame
• webcam.png - webcam screenshot
• HTML templates: $THUMBNAIL_TEMPLATE_DIR
• client-success.html - For client story videos (revenue numbers + face)
• interview.html - For interview/conversation videos
• educational.html - For tutorial/how-to videos
• Generator script: $THUMBNAIL_GENERATOR
• Full brand system: $THUMBNAIL_BRAND_SYSTEM

How to Generate a Thumbnail

Method 1: Puppeteer Script (Preferred)

cd "$THUMBNAIL_WORKDIR"
chmod +x generate-thumbnail.sh
./generate-thumbnail.sh <template> <output> --text-main "TEXT" --text-sub "TEXT" --face "$THUMBNAIL_FACE_IMAGE"

Examples:

# Client success story
./generate-thumbnail.sh client-success ./output/new-thumb.jpg \
  --text-main '$0 to $8K' --text-sub 'IN 30 DAYS' \
  --face $THUMBNAIL_FACE_IMAGE

# Interview thumbnail
./generate-thumbnail.sh interview ./output/interview.jpg \
  --text-main 'How I Built 3 AI Agents' --text-sub 'LIVE DEMO' \
  --face $THUMBNAIL_FACE_IMAGE

# Educational tutorial
./generate-thumbnail.sh educational ./output/tutorial.jpg \
  --text-main 'n8n + AI' --text-sub 'FULL TUTORIAL' \
  --face $THUMBNAIL_FACE_IMAGE

Method 2: AI Image Generation

When the Puppeteer script isn't enough (custom layouts, special effects), use the image_generate tool:

Prompt formula:

YouTube thumbnail, 1280x720, [SCENE DESCRIPTION].
Left side: photo of the approved presenter portrait,
wearing [OUTFIT]. Right side: bold white text "[3-5 WORDS]" on dark green
background (#031D16). Gold accent (#DFB771) highlight on key word.
Bottom right: small "<BRAND>" text in gold. High contrast, professional,
clean composition. No em dashes.

Brand Rules (MANDATORY)

• Font: Rethink Sans (800 for headlines, 700 for sub)
• Colors: Dark green #031D16, Gold #DFB771, White #F6FEFC, Emerald #247459
• Face size: Minimum 40% of frame height
• Text: 3-5 words max, 100-200px font size
• <BRAND> watermark: Bottom-right, gold, Rethink Sans 600
• Safe zone: Nothing in bottom-right 200x40px (YouTube timestamp)
• NO EM DASHES. EVER.

Thumbnail Categories

1. Client Success Stories (Most Important)

• Template: client-success
• Formula: Revenue number + client face/the presenter face + name
• Example text: "$0 to $8K", "IN 30 DAYS"
• Always include the revenue metric

2. Interviews / Conversations

• Template: interview
• Formula: Key insight + both faces (or the presenter alone)
• Example text: "$50K to $1M+", "ROSLAN"

3. Tutorials / Educational

• Template: educational
• Formula: Tool name + benefit + the presenter face
• Example text: "n8n + AI", "AUTOMATE EVERYTHING"

4. Vlog / Personal

• Use AI image generation for custom layouts
• More creative freedom, but keep brand colors

Quick Checklist Before Delivering

• [ ] 1280x720 exactly
• [ ] Under 2MB file size
• [ ] Face visible and large (40%+ of frame)
• [ ] Text readable on mobile (phone-sized preview)
• [ ] Gold accent (#DFB771) on at least one element
• [ ] <BRAND> watermark present
• [ ] No em dashes anywhere
• [ ] JPG quality 85-90%

Dependencies

Make sure Puppeteer is installed:

npm install -g puppeteer
# or if it fails:
apt-get install -y chromium-browser
npm install puppeteer