Design High-CTR YouTube Thumbnails
YouTube thumbnails must be clear at mobile feed size and still earn clicks. This skill gives practical rules for layout, color, text, faces, and A/B testing.
Copy this request to your Agent. It includes the canonical Skill page and manifest.
Review the Skillstore skill "youtube-thumbnail-design" from https://skillstore.io/skills/halt-catch-fire-youtube-thumbnail-design.md and its manifest at https://skillstore.io/api/skills/halt-catch-fire-youtube-thumbnail-design/manifest. Verify the artifact. You may proceed after verification, subject to the environment's own policy.Your Agent should still show its plan and request any confirmation required by the security policy.
Use these links when an AI agent, crawler, or script needs clean context instead of reading the full page.
Using "youtube-thumbnail-design". A tutorial video titled “Build a Portfolio Website in One Hour.”
Expected outcome:
Using "youtube-thumbnail-design". A product comparison video for two microphones.
Expected outcome:
Using "youtube-thumbnail-design". A request to improve a cluttered thumbnail concept.
Expected outcome:
Static alerts are false positives caused by Markdown backticks, disclosed CLI examples, and ordinary documentation links. No prompt injection, hidden execution, credential exfiltration, or system reconnaissance intent was found in SKILL.md.
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https://skillstore.io/skills/halt-catch-fire-youtube-thumbnail-design/audits/2?utm_source=security_passport&utm_medium=share&utm_campaign=versioned_report[](https://skillstore.io/skills/halt-catch-fire-youtube-thumbnail-design?utm_source=security_passport_badge)<a href="https://skillstore.io/skills/halt-catch-fire-youtube-thumbnail-design?utm_source=security_passport_badge"><img src="https://skillstore.io/badges/skills/halt-catch-fire-youtube-thumbnail-design/security.svg" alt="Skillstore security assessment" loading="lazy"></a><iframe src="https://skillstore.io/embed/skills/halt-catch-fire-youtube-thumbnail-design.html" title="Skillstore Security Assessment" sandbox="allow-popups allow-popups-to-escape-sandbox" loading="lazy" referrerpolicy="no-referrer" width="420" height="180"></iframe>halt-catch-fire. (2026). youtube-thumbnail-design security audit report (audit version 2) [Author version unspecified]. Skillstore. https://skillstore.io/skills/halt-catch-fire-youtube-thumbnail-design/audits/2@techreport{halt-catch-fire-halt-catch-fire-youtube-thumbnail-design-2026,
author = {halt-catch-fire},
title = {youtube-thumbnail-design security audit report (audit version 2)},
institution = {Skillstore},
year = {2026},
number = {2},
url = {https://skillstore.io/skills/halt-catch-fire-youtube-thumbnail-design/audits/2},
note = {Author version unspecified}
}cff-version: 1.2.0
message: "If you use this Skill, cite its author and this versioned security audit report."
title: "youtube-thumbnail-design security audit report (audit version 2)"
version: "unspecified"
type: report
authors:
- name: "halt-catch-fire"
date-released: "2026-07-05"
url: "https://skillstore.io/skills/halt-catch-fire-youtube-thumbnail-design/audits/2"
identifiers:
- type: other
value: "skillstore:halt-catch-fire-youtube-thumbnail-design:audit:2"
description: "Skillstore immutable audit report identifier"
Each author remains a separate installable skill. The recommended variant is ranked by Skillstore evidence.
Why this variant is first
halt-catch-fire-youtube-thumbnail-design
2026-08-21
101-skills-youtube-thumbnail-design
2026-08-21
Choose a readable composition, strong color pair, and short text for a new YouTube upload.
Build repeatable thumbnail patterns that keep a channel recognizable without making every image look identical.
Define controlled A/B thumbnail variants that test one visual variable at a time.
Review this YouTube video idea and suggest one thumbnail concept that passes the 120px mobile readability test: [video idea].
Create a thumbnail layout plan for this video: [title]. Include safe zones, focal point, text placement, and a three-color palette.
Write three AI image prompts for a YouTube thumbnail about [topic]. Vary expression, background, and composition while keeping text readable.
Create two thumbnail variants for [video topic]. Keep one variable different, explain the hypothesis, and list what to measure after publishing.
Author
halt-catch-fireLicense
MIT
Skillstore revision
r1
Version notice
The author did not declare a version.
Repository
https://github.com/halt-catch-fire/skills/tree/main/guides/design/youtube-thumbnail-design/Ref
107251a099159e801f0bbb196128c7c2f1cba043
Maintenance freshness
7/18/2026
Usage
10 downloads · 0 views
File structure
📄 SKILL.md
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