youtube-thumbnail-design SKILL.md skillA
youtube-thumbnail-design from aiskillstore/marketplace is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add aiskillstore/marketplace/youtube-thumbnail-design@git:20260710.e1c4d84Pins git:20260710.e1c4d84 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- aiskillstore/marketplace
- Path
skills/101-skills/youtube-thumbnail-design/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260710.e1c4d84, committed Jul 10, 2026
- Size
- 9,639 bytes
- Repository stars
- 471
- License
- none declared
YouTube thumbnail design with specific dimensions, contrast rules, and mobile preview optimization. Covers safe zones, text placement, face expression psychology, and A/B testing. Use for: YouTube thumbnails, video cover images, click-through optimization. Triggers: youtube thumbnail, thumbnail design, video thumbnail, click through rate, ctr optimization, youtube cover, video cover image, thumbnail maker, thumbnail tips, youtube design, video preview image.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
> **Install the belt CLI skill:** `npx skills add belt-sh/cli`
# YouTube Thumbnail Design
Create high-CTR YouTube thumbnails with AI image generation via [inference.sh](https://inference.sh) CLI.
## Quick Start
> Requires inference.sh CLI (`belt`). [Install instructions](https://raw.githubusercontent.com/inference-sh/skills/refs/heads/main/cli-install.md)
```bash
belt login
# Generate a thumbnail
belt app run falai/flux-dev-lora --input '{
"prompt": "YouTube thumbnail style, close-up of a person with surprised excited expression looking at a glowing laptop screen, vibrant blue and orange color scheme, dramatic studio lighting, shallow depth of field, high contrast, cinematic",
"width": 1280,
"height": 720
}'
```
## Specifications
| Spec | Value |
|------|-------|
| Dimensions | 1280 x 720 px (minimum) |
| Recommended | 1920 x 1080 px |
| Aspect ratio | 16:9 |
| Max file size | 2 MB |
| Formats | JPG, GIF, PNG |
## The 120px Test
Your thumbnail appears at roughly **120px wide** on mobile — that's how most viewers first see it.
**At 120px, viewers must be able to identify:**
1. The mood/emotion (from colors and expression)
2. The general subject (from composition)
…Read the whole file at its exact version.
How to install
mdr add aiskillstore/marketplace/youtube-thumbnail-design@sha256:e7e42243da58435aThe line at the top of this page pins the label git:20260710.e1c4d84, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_c3o5plxb2azg5cxe)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Jul 10, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (9639 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
aiskillstore/marketplace · 471 stars · license none declared · pushed 2026-11-08 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_c3o5plxb2azg5cxe GET https://markdownregistry.com/api/v1/resolve?ref=aiskillstore/marketplace/youtube-thumbnail-design GET https://markdownregistry.com/api/v1/blob/e7e42243da58435a7d5b465b9ca9f2cf94d5ad06cbc0cbd76dab017aef8b7bfd
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.