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 skills add novoads/agent-skills --skill generate-youtube-thumbnailgit clone --depth 1 https://github.com/novoads/agent-skillsWrote 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/novoads/agent-skills/generate-youtube-thumbnail)<a href="https://agentmods.dev/skills/novoads/agent-skills/generate-youtube-thumbnail"><img src="https://agentmods.dev/badge/skills/novoads/agent-skills/generate-youtube-thumbnail/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/novoads/agent-skills/generate-youtube-thumbnail"><img src="https://agentmods.dev/badge/skills/novoads/agent-skills/generate-youtube-thumbnail.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Data Exfiltration · line 125 Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
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 5.1 | $0.00080 | $0.03593 |
| Opus 5 | $0.00040 | $0.01796 |
| Sonnet 5 | $0.00016 | $0.00719 |
| Haiku 4.5 | $0.00008 | $0.00359 |
Grade A, and why
generate-youtube-thumbnail scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 10d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -sS -X POST "$NOVOADS_BASE_URL/v1/estimates" \ How it starts
The opening of the file, as written. The whole thing — 291 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Generate YouTube Thumbnail
A reusable workflow for creating YouTube thumbnails via Novoads' POST /v1/images with
nano-banana-pro, with proper character likeness and proven CTR formulas.
When to use this skill
Trigger on phrases like:
- "make me a YouTube thumbnail"
- "create a thumbnail for this video"
- "I need thumbnail variations / A/B tests"
- "remake this thumbnail with my face"
- "generate 10 thumbnail concepts"
- "thumbnail with [me / my product / my brand]"
Read order
Paths below are relative to this skill's own folder, and every file they name ships inside
it. That holds wherever the folder lands: the repo, the .claude/skills/ and .cursor/skills/
copies sync-skill.sh makes, or a standalone install of just this skill.
- This file — workflow, decision tree, batch generation
prompting/guide.md— likeness alignment, expressions cheat sheet, prompt structureprompting/formulas.md— 5 proven thumbnail formulas with templatesscripts/generate-batch.sh— the batch script (upload once → generate → download)
For the API contract itself — error codes, rate limits, the upload flow — the novoads-api
skill's reference.md is the authority.
Prerequisites
.envwithNOVOADS_API_KEY(novo_+ 64 hex). Verify with./scripts/check-novoads-env.sh.- Optional
PRODUCT_ID. Omit it and jobs land in your default product;productIdis organizational only and does not influence what is generated. - Reference images on disk (NOT pasted in chat — chat-pasted images are NOT accessible to the API):
face/— several photos of the subject (headshot + 3/4 angles + close-ups + expressions)logos/— brand logos as filesproducts/— clean product shotsexamples/— real ad screenshots, comparison materialstyle/— example thumbnails the user wants to match aesthetically
REST key required. A Novoads MCP connector is not a substitute. If
NOVOADS_API_KEYis missing or still the placeholder, stop before any generation work and tell the user: "Before continuing, create an API key at https://novoads.ai/dashboard/settings?tab=api and paste it into.env." That holds even whenmcp__novoads__*tools are connected and authenticated in the session. Never callmcp__novoads__*tools from this repo's workflows: they are a different surface with different behavior, including the units they quote costs in. Repo installs verify with./scripts/check-novoads-env.sh; a solo install checksNOVOADS_API_KEYin the environment.
What ships with it
5 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 10d ago First seen · 291 lines · 80 tokens per session scan A b89e858fac04
generate-youtube-thumbnail is a skill published in the GitHub repository novoads/agent-skills (14 stars, last pushed today), licensed MIT. It adds 80 tokens to every session and 3,593 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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