Thumbnail Creator

Q: What is a Claude Code skill and how does the Thumbnail Creator skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Thumbnail Creator is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Content category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: Content · Sub-category: content-misc · Last updated: 2026-06-18

ai:gemini

Generate article or newsletter thumbnail candidates using the Gemini API from inside Claude Code. Claude reads article copy, proposes composition concepts, writes image generation prompts incorporating brand specs, calls Gemini to generate the images, evaluates the results via computer vision, and returns ranked candidates with rationale. Use when asked to create thumbnails, generate cover images, or produce visual candidates for an article or newsletter.

Security AStatic scan found no risk patternsHow grading works ›

From the source SKILL.md

Generates article and newsletter thumbnail candidates by acting as an image-generation agent inside Claude Code. Instead of switching between tools and prompting Gemini's web UI one image at a time, this skill makes Claude do the full loop: read the copy, propose compositions, write tailored prompts, call the Gemini API, evaluate the outputs, and return ranked results with brief rationale.

What this skill does

Thumbnail Creator is a community-contributed Claude Code skill in the content-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/thumbnail-creator/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when asked to create thumbnails, generate cover images, or produce visual candidates for an article or newsletter.

Who uses this skill

The Thumbnail Creator Claude Code skill is built for content creators, marketers, copywriters, SEO professionals, and editorial teams. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 146,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/thumbnail-creator
curl -L https://claudskills.com/skills/thumbnail-creator/SKILL.md \
  -o ~/.claude/skills/thumbnail-creator/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/thumbnail-creator/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/thumbnail-creator/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\thumbnail-creator\SKILL.md on Windows. See the full install guide for step-by-step instructions.

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Thumbnail Creator Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/thumbnail-creator/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.

What does the Thumbnail Creator skill do?

Is this skill free to install?

Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.

When should I use the Thumbnail Creator skill?

Use Thumbnail Creator when your Claude Code task falls under the Content category — specifically in the content misc area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Thumbnail Creator" or describe the task and let Claude pick). Browse related skills at /category/content/.

What is a Claude Code skill and how does the Thumbnail Creator skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Thumbnail Creator is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Content category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Source: https://github.com/mohitagw15856/pm-claude-skills/blob/HEAD/plugins/pm-writers/skills/thumbnail-creator/SKILL.md
License: MIT
Author: mohitagw15856
Website: https://medium.com/product-powerhouse/claude-skills-the-ai-feature-thats-quietly-changing-how-product-managers-work-aad5d8d0640a

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA

mohitagw15856. (2026). Thumbnail Creator [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/thumbnail-creator/

BibTeX

@misc{thumbnail-creator-2026,
  author    = {mohitagw15856},
  title     = {Thumbnail Creator [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/thumbnail-creator/}
}

Embed this skill

Promote, attribute, or link this skill from your own README, blog post, or documentation. All three snippets are free to use — no sign-up, no API key. More distribution surfaces →

Badge

[![ClaudSkills](https://claudskills.com/badge/thumbnail-creator.svg)](https://claudskills.com/skills/thumbnail-creator/?utm_source=badge&utm_medium=readme&utm_campaign=skill_badge)

Security scan

Grade A · scanned 2026-07-06 — free static scan against the OWASP Agentic Skills Top 10.

The scan flagged 1 of 10 categories (persistence), including lower-severity patterns. Patterns shown inside code fences are weighted as examples rather than instructions — read the grading methodology for what this does and does not guarantee.

✓ Prompt injection
✓ Data exfiltration
✓ Supply chain
✓ Reverse shell
✓ Credentials
✓ Execution
✓ Filesystem
⚠ Persistence
✓ Obfuscation
✓ Network

Show this grade on your repo (click to copy):

[![Security: A](https://img.shields.io/badge/Security-A-2e7d32)](https://claudskills.com/skills/thumbnail-creator/#security)