youtube-thumbnail SKILL.md skillA
youtube-thumbnail from magnus919/agent-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add magnus919/agent-skills/youtube-thumbnail@git:20260930.54d81f7Pins git:20260930.54d81f7 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- magnus919/agent-skills
- Path
youtube-thumbnail/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260930.54d81f7, committed Sep 30, 2026
- Size
- 6,676 bytes
- Repository stars
- 166
- License
- MIT
Design, critique, and test YouTube video thumbnails and preview cards for stronger, better-qualified clicks. Use when developing thumbnail concepts, pairing a thumbnail with a title, directing image creation, checking small-screen legibility, preparing a YouTube experiment, or diagnosing thumbnail performance. Do not use for general video editing, channel strategy, or artwork for another platform.
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
# YouTube thumbnail design Make the right viewer curious about a real promise the video fulfills. A thumbnail is packaging, not a performance guarantee: earn attention without misrepresenting the video, and judge the result by qualified viewing rather than clicks alone. ## When not to use Use this skill for YouTube thumbnail strategy and production. For general channel positioning or growth plans, use a channel-strategy skill. For artwork that is not a YouTube preview card, use the relevant image, brand, or publication skill instead. ## Workflow 1. **Ground the promise in the video.** Inspect the supplied video, outline, transcript, title, and available image assets before inventing a concept. If the video itself is accessible, use an appropriate transcript/video capability. Write one sentence for what the video actually delivers, who should care, and what evidence or moment in the video proves it. If those facts are missing and cannot be found, ask a small number of targeted questions; do not fill gaps with invented stakes, people, outcomes, or scenes. …
Read the whole file at its exact version.
How to install
mdr add magnus919/agent-skills/youtube-thumbnail@sha256:c2934f2a509bedd4The line at the top of this page pins the label git:20260930.54d81f7, 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_svvznvcwvgj2x5ix)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Sep 30, 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 (6676 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
magnus919/agent-skills · 166 stars · license MIT · pushed 2026-11-04 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_svvznvcwvgj2x5ix GET https://markdownregistry.com/api/v1/resolve?ref=magnus919/agent-skills/youtube-thumbnail GET https://markdownregistry.com/api/v1/blob/c2934f2a509bedd491c6ecb279803eca5e7fb88f55f386a077de2a8bd91964ac
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.
More from magnus919/agent-skills
Every file in magnus919/agent-skills