Skills youtube-thumbnail-design

📦

youtube-thumbnail-design

Name: youtube-thumbnail-design
Author: 101-skills

Content revision r1 Medium Risk ⚙️ External commands🌐 Network access

Design High-Impact YouTube Thumbnails

Small, cluttered thumbnails lose attention in crowded YouTube feeds. This skill provides practical design rules and image prompts for clear, mobile-ready concepts.

Supports: Claude Codex Code(CC)

⚠️ 50 Poor

Install with my Agent

Copy this request to your Agent. It includes the canonical Skill page and manifest.

Agent request

Review the Skillstore skill "youtube-thumbnail-design" from https://skillstore.io/skills/101-skills-youtube-thumbnail-design.md and its manifest at https://skillstore.io/api/skills/101-skills-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.

Agent-readable resources

Use these links when an AI agent, crawler, or script needs clean context instead of reading the full page.

Markdown detail GET /skills/101-skills-youtube-thumbnail-design.md Signed manifest GET /api/skills/101-skills-youtube-thumbnail-design/manifest Signed lockfile GET /api/skills/101-skills-youtube-thumbnail-design/lockfile

Test it

Using "youtube-thumbnail-design". Create a concept for a beginner coding tutorial.

Expected outcome:

Use a bright laptop screen as the focal point, a curious face on the left, and the text START CODING in bold white.

Using "youtube-thumbnail-design". Plan an A/B test for a product comparison.

Expected outcome:

Variant A uses a warm yellow background.
Variant B uses a dark blue background.
Keep products, lighting, text, and composition identical.

Using "youtube-thumbnail-design". Review a thumbnail with eight words near the bottom-right corner.

Expected outcome:

Reduce the text to six words or fewer and move it away from the duration overlay zone.

Security Audit

Medium Risk

v3 • 7/12/2026 Open versioned report

Most static alerts are Markdown delimiters, inline code, ordinary links, or design prose rather than executable Ruby or reconnaissance. The skill does instruct users to run unpinned installers, authenticate with belt, and transmit prompts to third-party image services.

Files scanned

254

Lines analyzed

Review items

False positives ignored

Confirmed security concerns (1)

Medium

SKILL.md:18-25 SKILL.md:141-151

External Prompt Transmission and Authentication

The workflow authenticates through belt and sends thumbnail prompts to hosted image-generation providers, which may expose confidential prompt content to third parties.

The documented commands explicitly require login and invoke named hosted models with prompt payloads.

Capability review items (9)

These are real local capabilities that may be expected for this skill, so they require review but are not counted as confirmed malicious behavior.

Medium

SKILL.md:7

Ruby/shell backtick execution

> **Install the belt CLI skill:** `npx skills add belt-sh/cli`

The line explicitly instructs users to run an unpinned npx installation command, which executes third-party package code and changes the local skill installation.

Medium

SKILL.md:17-26

Ruby/shell backtick execution

```bash

The fenced block instructs users to execute belt login and belt app run commands, which authenticate and invoke an external image-generation service.

Medium

SKILL.md:139-152

Ruby/shell backtick execution

```bash

The fenced block contains two belt app run commands that send prompts to external image-generation models.

Medium

SKILL.md:157-163

Ruby/shell backtick execution

```bash

The fenced example invokes belt app run against a hosted image-generation model.

Medium

SKILL.md:166-172

Ruby/shell backtick execution

```bash

The fenced example invokes belt app run against a hosted image-generation model.

Medium

SKILL.md:175-181

Ruby/shell backtick execution

```bash

The fenced example invokes belt app run against a hosted image-generation model.

Medium

SKILL.md:184-190

Ruby/shell backtick execution

```bash

The fenced example invokes belt app run against a hosted image-generation model.

Medium

SKILL.md:205-217

Ruby/shell backtick execution

```bash

The fenced block contains asynchronous belt app run commands that invoke an external service for A/B variants.

Medium

SKILL.md:246-250

Ruby/shell backtick execution

```bash

The fenced block instructs users to run three unpinned npx installation commands that execute third-party package code.

Risk Factors

Audited by: codex View Audit History →

Share & cite this report

Share the versioned assessment report, neutral badge, embed card, and citations. Skillstore reports evidence without deciding whether this Skill is safe.

Open versioned report

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https://skillstore.io/skills/101-skills-youtube-thumbnail-design/audits/3?utm_source=security_passport&utm_medium=share&utm_campaign=versioned_report

Markdown badge

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Academic citations (APA · BibTeX · CFF)

APA citation

101-skills. (2026). youtube-thumbnail-design security audit report (audit version 3) [Author version unspecified]. Skillstore. https://skillstore.io/skills/101-skills-youtube-thumbnail-design/audits/3

BibTeX citation

@techreport{101-skills-101-skills-youtube-thumbnail-design-2026,
  author = {101-skills},
  title = {youtube-thumbnail-design security audit report (audit version 3)},
  institution = {Skillstore},
  year = {2026},
  number = {3},
  url = {https://skillstore.io/skills/101-skills-youtube-thumbnail-design/audits/3},
  note = {Author version unspecified}
}

CITATION.cff

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 3)"
version: "unspecified"
type: report
authors:
  - name: "101-skills"
date-released: "2026-07-12"
url: "https://skillstore.io/skills/101-skills-youtube-thumbnail-design/audits/3"
identifiers:
  - type: other
    value: "skillstore:101-skills-youtube-thumbnail-design:audit:3"
    description: "Skillstore immutable audit report identifier"

Compare variants

2 installable variants

Each author remains a separate installable skill. The recommended variant is ranked by Skillstore evidence.

Why this variant is first

Highest Skillstore Score

Author / source Skillstore Score Evidence Confidence Skillstore usage Updated

halt-catch-fire Recommended

halt-catch-fire-youtube-thumbnail-design

Skillstore Score 77

Evidence Confidence High

Skillstore usage 12

Updated

2026-08-21

101-skills Current

101-skills-youtube-thumbnail-design

Skillstore Score 50

Evidence Confidence Medium

Skillstore usage 7

Updated

2026-08-21

Skillstore Score

Why this score Evidence Confidence: Medium

Architecture

Maintainability

Content

Community

Spec Compliance

What You Can Build

Launch a New Video

Create a clear thumbnail concept that matches the topic, title, and intended viewer emotion.

Standardize Channel Visuals

Define reusable contrast, text, face, and safe-zone rules across a publishing calendar.

Test Competing Concepts

Prepare controlled variants that isolate color, expression, text, background, or composition.

Try These Prompts

Create a Basic Concept

Create a YouTube thumbnail concept for [video topic]. Use one focal point, strong contrast, and no more than six text words.

Write an Image Prompt

Write an image-generation prompt for [video topic] using [brand colors], a clear subject, dramatic lighting, and a mobile-readable composition.

Review a Thumbnail

Review this thumbnail description: [description]. Check safe zones, contrast, text length, focal point, mobile readability, and alignment with the video.

Plan an A/B Test

Design two thumbnail variants for [video]. Keep all elements fixed except [test variable], and explain the hypothesis and evaluation criteria.

Best Practices

Preview every concept at approximately 120 pixels wide before finalizing it.
Use one focal point, no more than three colors, and strong subject-background contrast.
Change only one variable between A/B test variants.

Avoid

Do not repeat the full video title as small thumbnail text.
Do not place faces, text, or essential details under interface overlays.
Do not use misleading imagery that conflicts with the video content.

Frequently Asked Questions

What dimensions should I use?

Use a 16:9 canvas at 1280 by 720 pixels minimum. A 1920 by 1080 canvas provides additional working detail.

How much text should a thumbnail contain?

Use six words or fewer in a bold sans-serif style. Remove text when the image already communicates the idea.

Does the skill generate finished thumbnails?

It can generate base images through belt. Final typography, branding, compression, and quality review may require a separate design tool.

Why should I preview at 120 pixels?

Many viewers first see thumbnails at small mobile sizes. The preview reveals unreadable text, weak contrast, and unclear subjects.

Can this guarantee a higher click-through rate?

No. Results depend on audience, topic, title, competition, and content quality. Use controlled tests to measure performance.

Does the workflow send data to external services?

Yes. Belt commands authenticate with and send prompts to hosted image providers. Do not include confidential information in prompts.

Developer Details

Author

101-skills

License

MIT

Skillstore revision

Version notice

The author did not declare a version.

Repository

https://github.com/101-skills/skills/tree/main/guides/design/youtube-thumbnail-design/

Ref

d71c7417a35d5c2624161bd2fe8de8a41a362128

Maintenance freshness

7/18/2026

Usage

1 downloads · 0 views

File structure

📄 SKILL.md