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-newsletter-headerWrote 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-newsletter-header)<a href="https://agentmods.dev/skills/slogsdon/skills-design/design-newsletter-header"><img src="https://agentmods.dev/badge/skills/slogsdon/skills-design/design-newsletter-header/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-newsletter-header"><img src="https://agentmods.dev/badge/skills/slogsdon/skills-design/design-newsletter-header.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 | $0.00117 | $0.02020 |
| Opus 5 | $0.00059 | $0.01010 |
| Sonnet 5 | $0.00023 | $0.00404 |
| Haiku 4.5 | $0.00012 | $0.00202 |
Grade A, and why
design-newsletter-header 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 — 164 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill: newsletter-header
Produces a 600×200 pixel-exact HTML canvas for use as a newsletter email header. The canvas is small — typography choices must be ruthless. Display sizes top out around 36–48px; meta around 11–14px. The artifact is meant to be screenshot to PNG and embedded as <img> in the email — the email client never sees raw HTML, so font and CSS quirks don't matter for delivery.
When to use
- User publishes a newsletter and needs a branded header banner image
- A
DESIGN.mdexists for the brand
Inputs
- Required: brand slug, newsletter title or issue identifier (e.g. "Working notes — May 2026")
- Optional: issue number, dateline, tagline (max 6 words)
Output
./design/<brand-slug>/artifacts/newsletter-header-YYYY-MM-DD-<slug>.html
Steps
1. Verify brand exists
test -f ./design/<brand-slug>/tokens.css
If missing, stop and tell the user to run /design-system <brand-slug> first.
2. Gather the brief
Ask in one message:
1. Header text — the masthead string (max 6 words)
2. Optional issue number / dateline (e.g. "Issue 003 · 2026.05.02")
3. Optional tagline / subtitle (max 6 words)
If the user gives 8+ words, push back: "600×200 won't hold that legibly. Cut to the masthead + meta." Don't proceed until they agree.
3. Pick variation — ARCHITECTURE FIRST
Pick ONE. Newsletter headers favor restraint — pick the simplest archetype that carries the brand register:
chrome-led— masthead title + meta strip (issue / date). The classic newsletter header pattern; brand-earned for editorial titles.type-only— title alone at maximum scale; no meta at all.inverse-text— full canvas dark inversion (canonical v2 feature treatment) — masthead in cream on ink.object-of-content— looks like a printed masthead from a magazine/quarterly cover.
Then pick:
- Layout:
symmetric | asymmetric | full-bleed | split - Color usage:
monochrome | single-accent | inverted
Cross-artifact rule: vary from the brand's most recent header (issue 002 vs issue 003 should not be visually identical).
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 · 164 lines · 117 tokens per session scan A 0ea3319353d1
design-newsletter-header is a skill published in the GitHub repository slogsdon/skills-design (3 stars, last pushed 28d ago), licensed MIT. It adds 117 tokens to every session and 2,020 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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