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Design a high-CTR YouTube thumbnail — striking imagery, bold text placement, and emotional face/subject if needed.
Passed 8 of 15 test cases with the skill, and 6 of 15 without it.
and 7 more in the full report
8 fixed3 passed either way5 still failing6 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 8 test cases the skill fixed. Same model, same prompt, with and without the skill.
I want to run the thumbnail generator via CLI, but I am getting an unauthenticated API error. What CLI configuration command should be run first if MUAPI_API_KEY is unset?
| Checked | Without skill | With skill |
|---|---|---|
| specifies muapi auth configure | Missed | Passed |
| explains how to set up authentication before issuing generation requests | Passed | Passed |
The instructions your model reads when the skill loads.
Design a high-CTR YouTube thumbnail — striking imagery, bold text placement, and emotional face/subject if needed.
| 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"). |
channel_style | text | no | bold, high contrast, bright colors, clean design, YouTube tech aesthetic | Channel brand style (e.g. "dark moody gaming", "bright educational", "minimal corporate"). |
subject_description | text | no | — | Optional description of the person or subject to feature (e.g. "a surprised young man in a hoodie"). |
Thumbnails are the #1 factor in YouTube CTR. Generate a single, maximum-impact 16:9 image.
Before generating, briefly reason about the best thumbnail formula for this topic:
{{subject_description}} if provided, otherwise design an object/scene that dramatizes the topic.{{channel_style}}.{{channel_style}}, youtube thumbnail composition, ultra detailed, vibrant, high contrast, 16:9.muapi image generate (model=gpt-image-2-text-to-image, aspect_ratio=16:9).After generation, return:
{{title}}.test cases passed, vs 6 / 15 without
More skills from the same source and nearby in the registry, with their headline benchmark lift.