Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/nicepkg/ai-workflow/thumbnail-concept-generatornpx skills add nicepkg/ai-workflow --skill thumbnail-concept-generatorgit clone --depth 1 https://github.com/nicepkg/ai-workflowWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/nicepkg/ai-workflow/thumbnail-concept-generator)<a href="https://agentmods.dev/skills/nicepkg/ai-workflow/thumbnail-concept-generator"><img src="https://agentmods.dev/badge/skills/nicepkg/ai-workflow/thumbnail-concept-generator.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00049 | $0.02040 |
| Opus 5 | $0.00024 | $0.01020 |
| Sonnet 5 | $0.00010 | $0.00408 |
| Haiku 4.5 | $0.00005 | $0.00204 |
Grade A, and why
thumbnail-concept-generator scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 293 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Thumbnail Concept Generator
Create click-worthy thumbnail concepts that maximize CTR.
Thumbnail Psychology
📊 THUMBNAIL IMPACT:
- 90% of top-performing videos have custom thumbnails
- Thumbnails are responsible for ~50% of a video's click-through rate
- Viewers decide in <2 seconds whether to click
KEY PRINCIPLE: Thumbnail must work at SMALL sizes (mobile, sidebar)
Thumbnail Elements
1. Faces & Emotions
EMOTION SCALE (from most to least effective):
1. 😱 Shock/Surprise - Wide eyes, open mouth
2. 🤔 Curiosity - Raised eyebrow, intrigued look
3. 😄 Joy/Excitement - Genuine smile, energy
4. 😤 Frustration/Anger - Visible emotion
5. 🤯 Mind-blown - Exaggerated reaction
6. 😢 Sadness - For emotional content
FACE RULES:
- Eyes should be visible and expressive
- Face takes up 30-50% of thumbnail
- Direct eye contact with camera
- Avoid sunglasses/obstructions
2. Text Overlay
TEXT RULES:
- Maximum 3-4 words
- Large, bold, readable at small size
- Contrasting colors (white on dark, dark on light)
- Don't repeat the title exactly
- Use outline/shadow for readability
EFFECTIVE TEXT:
✅ "IT WORKED" / "$10K" / "DON'T BUY" / "vs"
❌ "Watch this video to see what happens when I try..."
3. Color Psychology
RED: Urgency, excitement, warning
YELLOW: Attention, energy, optimism
BLUE: Trust, calm, professional
GREEN: Growth, money, nature
ORANGE: Enthusiasm, creativity
PURPLE: Luxury, creativity
BLACK: Premium, serious, drama
WHITE: Clean, simple, contrast
4. Composition Rules
RULE OF THIRDS: Place key elements at intersection points
Z-PATTERN: Eye travels Z-shape (top-left → top-right → bottom-left → bottom-right)
CONTRAST: Main subject must pop from background
NEGATIVE SPACE: Don't overcrowd - let elements breathe
Thumbnail Templates by Video Type
Tutorial/How-To
┌─────────────────────────────────────┐
│ [RESULT/OUTCOME] │ FACE │
│ Text: "EASY" │ (excited/ │
│ or "5 MIN" │ helpful) │
│ │ │
│ [Tool/Product │ │
│ being used] │ │
└─────────────────────────────────────┘
Elements:
- Split screen or diagonal divide
- Before/After if applicable
- Tool/product clearly visible
- Helpful/excited facial expression
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2d ago First seen · 293 lines · 49 tokens per session scan A 3e419316ca9a
thumbnail-concept-generator is a skill published in the GitHub repository nicepkg/ai-workflow (282 stars, last pushed 7mo ago), licensed MIT. It adds 49 tokens to every session and 2,040 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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