YouTube Thumbnail Generation Skill (2026 Edition)

Overview

This skill enables fully autonomous generation of professional YouTube thumbnails in 11 strategic styles from THUMBNAILS.md. Zero user interaction required after the initial request. The agent auto-selects style, builds a prompt, generates the base image via the best available AI backend, applies compositing and text via Pillow, and saves a final 1280×720 PNG to /mnt/user-data/outputs/thumbnail.png.

When to Trigger This Skill

Trigger when the user:

• Says "create a thumbnail", "make a thumbnail", "generate a YouTube thumbnail"
• Provides a video title or topic and needs a visual
• Wants product video covers, presentation title slides, or channel art
• Needs batch thumbnail creation or automation for a YouTube workflow