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 mrcha033/yonsei-skills --skill book-yonsei-shuttlegit clone --depth 1 https://github.com/mrcha033/yonsei-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/mrcha033/yonsei-skills/book-yonsei-shuttle)<a href="https://agentmods.dev/skills/mrcha033/yonsei-skills/book-yonsei-shuttle"><img src="https://agentmods.dev/badge/skills/mrcha033/yonsei-skills/book-yonsei-shuttle/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/mrcha033/yonsei-skills/book-yonsei-shuttle"><img src="https://agentmods.dev/badge/skills/mrcha033/yonsei-skills/book-yonsei-shuttle.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 | $0.00084 | $0.00934 |
| Opus 5 | $0.00042 | $0.00467 |
| Sonnet 5 | $0.00017 | $0.00187 |
| Haiku 4.5 | $0.00008 | $0.00093 |
Grade A, and why
book-yonsei-shuttle 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 11d 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.
The source is not reproduced here
A licence we could not identify
The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.
What ships with it
7 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.
- 11d ago First seen · 94 lines · 84 tokens per session scan A c871d265b464
book-yonsei-shuttle is a skill published in the GitHub repository mrcha033/yonsei-skills (9 stars, last pushed 29d ago), with no licence file. It adds 84 tokens to every session and 934 once invoked, about $0.0004 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.
Other skills, from other repositories
houseclean
Cross-drive storage audit and cleanup. Surveys all drives, finds orphaned git worktrees, large AI tool caches (.ollama, .gemini, .cursor, npm, pip), and buildable artifacts (nodemodules, .venv). Produces a prioritized action plan with specific migration commands. Use when disk space is low or worktrees need cleanup…
schedule
Manages recurring and one-off scheduled tasks. Session-scoped scheduling via CronCreate/CronDelete/CronList. Documents the cloud path for tasks that need to survive machine sleep or network drops.
zapier-explore
Explore what Zapier MCP can do for the user — interview them about their role and the apps they live in, suggest specific use cases as on-demand prompts, then walk them through enabling the actions to make those use cases real. The natural next step after zapier-demo. Use when the user asks "what else can Zapier do…
token-efficiency
Token conservation economics, bounded context-window pruning, AST structural query optimization, and high-precision prompt budget discipline.
structure-swift-sources
Organize Swift source trees and oversized Swift files by feature, layer, and declaration group; split large files, normalize // MARK: sections, enforce plain-language block-comment file headers, and move TODO and FIXME text into ledger files. Use after format-swift-sources has established a clean formatting baseline.
tips-helpviewer-workflow
Discover local user-guide topics for installed Apple Mac apps through the Tips HelpViewer catalog, with app matching, installed-version capture, result verification, and authoritative fallback routing. Use when Codex needs task-specific help for an installed Apple app, needs to find a menu command through local Help…