Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/slogsdon/skills-designnpx agentmods add skills/slogsdon/skills-design/design-youtube-channel-artWrote 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/slogsdon/skills-design/design-youtube-channel-art)<a href="https://agentmods.dev/skills/slogsdon/skills-design/design-youtube-channel-art"><img src="https://agentmods.dev/badge/skills/slogsdon/skills-design/design-youtube-channel-art/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/slogsdon/skills-design/design-youtube-channel-art"><img src="https://agentmods.dev/badge/skills/slogsdon/skills-design/design-youtube-channel-art.svg" alt="Reviewed on agentmods" width="80" 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 5.1 | $0.00116 | $0.02722 |
| Opus 5 | $0.00058 | $0.01361 |
| Sonnet 5 | $0.00023 | $0.00544 |
| Haiku 4.5 | $0.00012 | $0.00272 |
Grade A, and why
design-youtube-channel-art 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 12d 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 — 227 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill: youtube-channel-art
Produces a single self-contained HTML file containing two pixel-exact canvases:
- Full banner (2560×1440) — the TV-display-ready full asset that uploads to YouTube
- Safe zone preview (1546×423) — what mobile + desktop visitors actually see; ALL critical content must sit inside this zone
YouTube renders the same banner asset at vastly different aspect ratios across devices (TV uses the full 2560×1440; desktop crops to a wide letterbox; mobile crops to a tighter rectangle). The safe zone is the only region guaranteed visible everywhere. Brand mark + tagline live in the safe zone; the wider canvas extends with breathing room (or texture, or extension of brand surface) that TV viewers see.
When to use
- User runs a YouTube channel and needs banner art that works across TV / desktop / mobile
- A
DESIGN.mdexists for the brand
Inputs
- Required: brand slug, channel name (or wordmark text)
- Required: tagline (1 line, max ~10 words; sentence-case ending in period per brand voice)
- Optional: category labels (e.g. "field notes · payments · platforms"), social handle for footer
- Optional: secondary cue (e.g. upload schedule "new every Tuesday.")
Output
./design/<brand-slug>/artifacts/youtube-channel-art-YYYY-MM-DD-<slug>.html
Steps
1. Verify brand exists
test -f ./design/<brand-slug>/tokens.css
2. Gather the brief
Ask in one message:
1. Channel name / wordmark
2. Tagline — 1 line, max 10 words, sentence-case ending in period
3. Optional category strip — short topic labels separated by mid-dot
4. Optional secondary cue — upload schedule or call-to-action
5. Social handle (optional, footer position)
If the user gives 11+ words for the tagline, push back: "It needs to fit in the 1546×423 safe zone with breathing room. What's the line that lands?" Don't proceed until they agree.
3. Pick variation — apply CONSISTENTLY to both canvases
The full banner and safe zone preview must show the same content treatment — they're the same asset rendered at different framings. Pick ONE:
What ships with it
1 file 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.
- 12d ago First seen · 227 lines · 116 tokens per session scan A 40ada880bc7f
design-youtube-channel-art is a skill published in the GitHub repository slogsdon/skills-design (3 stars, last pushed 28d ago), licensed MIT. It adds 116 tokens to every session and 2,722 once invoked, about $0.0006 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 2026-08-31.
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