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 CaesiumY/ko-design-md --skill use-design-mdgit clone --depth 1 https://github.com/CaesiumY/ko-design-mdWrote 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/caesiumy/ko-design-md/use-design-md)<a href="https://agentmods.dev/skills/caesiumy/ko-design-md/use-design-md"><img src="https://agentmods.dev/badge/skills/caesiumy/ko-design-md/use-design-md/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/caesiumy/ko-design-md/use-design-md"><img src="https://agentmods.dev/badge/skills/caesiumy/ko-design-md/use-design-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00193 | $0.01707 |
| Opus 5.5 | $0.00077 | $0.00683 |
| Sonnet 5.5 | $0.00039 | $0.00341 |
| Haiku 4.5 | $0.00019 | $0.00171 |
Grade A, and why
use-design-md 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 13d 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.
rules. Fetch with `curl`, which writes the response body to a file byte for byte. A How it starts
The opening of the file, as written. The whole thing — 110 lines — stays where its author put it; the contents beside it link to each section on GitHub.
use-design-md — consumer skill for the ko/design.md catalog
The ko-design-md catalog (https://www.getdesign.kr) publishes one DESIGN.md per Korean
brand: colors in OKLCH, typography, spacing, radius, components, and do's & don'ts. This
skill pulls the right entry and uses it as the design brief for UI work in the current
project. Invoked by name it is /use-design-md (skills.sh) or
/ko-design-md:use-design-md (Claude Code plugin marketplace).
Fetching — files, failures, the whole document
Every catalog fetch (index, entry, token sidecar, GitHub raw fallback) follows these
rules. Fetch with curl, which writes the response body to a file byte for byte. A
web-reading tool that passes the page through a model (Claude Code: WebFetch)
summarizes and drops exact values (an OKLCH triple, a 13px step); use one only when you
have no shell at all.
- Save to a file, don't print to the terminal. Entries run to tens of kilobytes, and
a shell tool caps the output it hands back (Claude Code: around 30,000 characters),
silently dropping the back half — components, do's & don'ts, known gaps. Download into
your per-user cache,
"${XDG_CACHE_HOME:-$HOME/.cache}/use-design-md/"(not the user's project, not a shared/tmp);--create-dirsmakes it, so each fetch stays one plaincurlcommand (a compoundmkdir …; curl …is refused where onlycurlis allowed to run). - Make HTTP failures fail.
curl -fsSL --create-dirs -o <file> <url>.-fturns a 404/5xx into a non-zero exit — without it a missing slug's one-lineNot found: <slug>body arrives as if it were the document. After a non-zero exit you did not get the file; what's on disk may be stale or partial — don't read it. - Read the file to the end. Check its size (
wc -lc <file>), then read it with your file-reading tool. That tool may cap a single read too, so when one read doesn't reach the end, read the rest in chunks (Claude Code:offset/limit). You're done when you've seen the last line numberwc -lreported. If your file reader expects a different path form than your shell prints, convert it (Git Bash on Windows:cygpath -w <file>).
What ships with it
2 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.
- 13d ago Changed · +6 lines 0526e92ae07f
- 14d ago Changed · +2 lines 8ab0ae3c09e8
- 20d ago Changed · -50 lines · -33 tokens per session 71174882d951
- 22d ago Changed · +35 lines 1814707971c2
- 27d ago Changed ca320f937f68
- 1mo ago Changed · +4 lines 0d2ce876dfa3
- 1mo ago Changed · -1 lines e039b04751a7
- 1mo ago First seen · 114 lines · 226 tokens per session scan A 3cad72a6fb7b
use-design-md is a skill published in the GitHub repository CaesiumY/ko-design-md (65 stars, last pushed yesterday), licensed MIT. It adds 193 tokens to every session and 1,707 once invoked, about $0.0008 per session on Opus 5.5. 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 2026-08-30.
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