| name | thumbnail-design |
| description | Design YouTube thumbnails โ iterative generation with style templates, user photos, and text overlays. Use when the user asks to create, modify, or iterate on a thumbnail. |
Thumbnail Design
Process
- Understand the concept โ what's the video about, what emotion to convey
- Propose a concept โ describe what the thumbnail should contain:
- Main visual element (person, product, diagram)
- Text overlay (2-5 words max, high contrast)
- Color scheme and mood
- Composition (rule of thirds, focal point)
- Get user approval on the concept
- Generate โ use
design_thumbnail tool
- Iterate โ refine based on feedback (the tool preserves context)
Design Principles
- Size: 1280x720px (16:9 ratio) โ YouTube standard
- Text: Maximum 5 words, readable at mobile size (phone screen)
- Faces: Close-up faces with expressive emotions get higher CTR
- Colors: High contrast, saturated โ stand out in feed
- Composition: Subject on one side, text on the other (rule of thirds)
- Branding: Consistent style across series videos
Style Templates
The user may have uploaded style templates. When available:
- Reference their existing thumbnail style
- Match colors, fonts, layout patterns
- For series videos: same template, different text/subject
User Photos
Users upload personal photos for use as reference. When generating:
- Use the user's face/appearance as reference
- Match their typical presentation style
- Can combine with different backgrounds/effects
Iteration Patterns
Common refinement requests:
- "ืืืื ืืช ืืืงืกื" โ make text bigger
- "ืฉื ื ืฆืืขืื" โ change color scheme
- "ืชืืกืืฃ ืืช ืืคื ืื ืฉืื" โ add user's face
- "ืชืขืฉื ืืื ืืกืจืืื ืืงืืื" โ match previous thumbnail style
- "ืืืชืจ ืืจืืื" โ more dramatic expression/contrast
Important
- Always confirm concept before generating (saves API calls)
- The tool maintains conversation context โ refer to previous iterations
- If user provides a reference thumbnail from another video, analyze its style first
