k-skill is a collection of skills that lets coding agents handle Korean everyday services, including transport, travel, shopping, messaging, and government websites. Korean users install it to delegate routine tasks to agents such as Claude Code, Codex, and OpenCode. The catalogue entries are individual skills from this collection.
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 NomaDamas/k-skill --skill popbillgit clone --depth 1 https://github.com/NomaDamas/k-skillWrote 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/nomadamas/k-skill/popbill)<a href="https://agentmods.dev/skills/nomadamas/k-skill/popbill"><img src="https://agentmods.dev/badge/skills/nomadamas/k-skill/popbill/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/nomadamas/k-skill/popbill"><img src="https://agentmods.dev/badge/skills/nomadamas/k-skill/popbill.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk warn
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 | $0.00547 |
| Opus 5 | $0.00040 | $0.00273 |
| Sonnet 5 | $0.00016 | $0.00109 |
| Haiku 4.5 | $0.00008 | $0.00055 |
Grade C, and why
popbill scanned grade C 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 8d 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.
Hidden instructionshighPrompt injection
Directives inside HTML comments, invisible characters or bidirectional overrides are read by the model and not by the person reviewing the file.
<!-- k-skill:cli-stub — generated by scripts/generate-skill-stubs.js; edit skill.json / instruction.md instead --> This is a copy
91% identical to bunjang-search — 16 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 48 lines — stays where its author put it; the contents beside it link to each section on GitHub.
popbill
Get the full instructions (required first step)
Run this and follow its output as the primary instructions for this skill:
npx -y @nomadamas/k-skill@0 instruct popbill
The CLI detects the current runtime (Dolshoi vault/CloakBrowser vs generic) and prints only the applicable instructions, always up to date. Helper files bundled with the CLI are listed by:
npx -y @nomadamas/k-skill@0 files popbill
If npx is unavailable, install Node.js 18+ or follow https://github.com/NomaDamas/k-skill#readme, or read the source instructions at https://github.com/NomaDamas/k-skill/blob/main/popbill/instruction.md.
Legal disclaimer (required)
This skill is not an official feature of, officially supported by, affiliated with, sponsored by, approved by, or developed in collaboration with any third-party trademark owner or service operator it identifies. Third-party names are used only to describe the skill's function, lookup target, or compatibility.
Any automated collection of publicly accessible information must be limited to personal, non-organizational lookup. Do not use this skill for systematic or bulk crawling, database building, access-control or block circumvention, or conduct that interferes with a third party's business or service.
Read the full Korean legal disclaimer, including the cited Korean Supreme Court precedents and statutory limits, before use:
npx -y @nomadamas/k-skill@0 read popbill references/DISCLAIMER.md
Hard rules even without the CLI
- Never execute payment, message/email delivery, final submission, cancellation, or public posting without the user's explicit approval immediately beforehand.
- Never ask for, print, or store plaintext credentials in chat, files, or shell arguments.
- Never bypass legal, physical-presence, CAPTCHA, identity-proofing, or electronic-signature boundaries.
What ships with it
11 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.
- instruction.md 7.0 KB
- references/DISCLAIMER.md 2.0 KB
- references/TRADEMARK-LEGAL-STATEMENT.md 1.7 KB
- scripts/popbill_cli.py 11 KB runs code
- scripts/popbill_registry.py 1.3 KB runs code
- scripts/popbill_safety.py 746 B runs code
- scripts/popbill_templates.py 2.5 KB runs code
- skill.json 793 B
- tests/fake_popbill.py 1.1 KB runs code
- tests/run_tests.py 3.0 KB runs code
- tests/test_popbill_cli.py 2.5 KB runs code
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.
- 8d ago First seen · 48 lines · 80 tokens per session scan C 92e11b4ffe4f
popbill is a skill published in the GitHub repository NomaDamas/k-skill (7,496 stars, last pushed yesterday), licensed MIT. It adds 80 tokens to every session and 547 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it C with 1 finding (hidden instructions). It is 91% identical to bunjang-search, differing in 16 lines, and is treated as a copy.
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