Agent skill · design visual · samuraigpt
muapi-youtube-thumbnail
Design a high-CTR YouTube thumbnail — striking imagery, bold text placement, and emotional face/subject if needed.
Why this skill is useful
Provides specific guidance on creating high-CTR YouTube thumbnails, including composition strategies and image generation prompts that the AI wouldn't reliably generate on its own.
What it needs
Requires muapi installed locally. Requires muapi account access. About 2k tokens when loaded. Last updated 2026-08-04. 3,990 stars on the source repository.
What this skill does
YouTube Thumbnail Design a high-CTR YouTube thumbnail — striking imagery, bold text placement, and emotional face/subject if needed. Inputs Name Type Required Default Description :--- :--- :--- :--- :--- title text yes — The video title or topic (e.g. "I tried 7 AI tools in 24 hours — here's what happened"). channelstyle text no bold, high contrast, bright colors, clean design, YouTube tech aesthetic Channel brand style (e.g. "dark moody gaming", "bright educational", "minimal corporate"). subjectdescription text no — Optional description of the person or subject to feature (e.g. "a surprised young man in a hoodie"). Steps Thumbnails are the #1 factor in YouTube CTR. Generate a single, maximum-impact 16:9 image. Phase A — Plan the composition Before generating, briefly reason about the best thumbnail formula for this topic: Emotion-first: shocked/curious face if relevant + bold text = high CTR Text overlay: 3–5 words max, high-contrast (white/yellow on dark, or vice-versa) Contrast & saturation: thumbnails compete in a grid — they must pop Phase B — Generate the thumbnail 1. Build the image generation prompt: Subject: {{subjectdescription}} if provided, otherwise design an object/scene that dramatizes the topic. Mood: derives from {{channelstyle}}. Composition: rule-of-thirds, subject on left or right with empty space for text. Style tags: {{channelstyle}}, youtube thumbnail composition, ultra detailed, vibrant, high contrast, 16:9. 2. Call muapi image generate (model=gpt-image-2-text-to-image, aspectratio=16:9). Phase C — Text overlay guidance After generation, return: Suggested overlay text: 3–5 bold words that complement the title {{title}}. Text placement: where on the canvas to position text (e.g. "bold yellow text, top-right third"). Font recommendation: style suggestion (e.g. "Impact-style all-caps with black outline"). Notes Never put too much text in the prompt — text rendering in image models is unreliable. …
How to use it
Reference it in AdaL, Claude Code, Cursor or any coding agent — nothing to install:
@skills samuraigpt/youtube-thumbnail