sanyuan-skills is a collection of reusable instructions, called agent skills, that extend Claude Code and other AI coding terminals with defined workflows. Developers use it for code review, learning, skill quality checks, skill creation, and organizing knowledge into wikis or study materials. 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 sanyuan0704/sanyuan-skills --skill book-studygit clone --depth 1 https://github.com/sanyuan0704/sanyuan-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/sanyuan0704/sanyuan-skills/book-study)<a href="https://agentmods.dev/skills/sanyuan0704/sanyuan-skills/book-study"><img src="https://agentmods.dev/badge/skills/sanyuan0704/sanyuan-skills/book-study/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/sanyuan0704/sanyuan-skills/book-study"><img src="https://agentmods.dev/badge/skills/sanyuan0704/sanyuan-skills/book-study.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
- 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 | $0.00121 | $0.03265 |
| Opus 5 | $0.00060 | $0.01632 |
| Sonnet 5 | $0.00024 | $0.00653 |
| Haiku 4.5 | $0.00012 | $0.00327 |
Grade A, and why
book-study 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 — 350 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Book Study — Reading Coach
Guide users through books systematically. Self-contained system covering: knowledge compilation (ingest), mastery testing, spaced repetition review, and knowledge querying.
IRON LAW: Understanding is proven by explanation + example + application. Never mark a concept as mastered just because the user says "got it."
Usage
/book-study <book-name> # Start a new book or resume progress
/book-study <book-name> --chapter 3 # Jump to chapter 3
/book-study ingest # Compile current chapter to wiki
/book-study query <keyword> # Query the knowledge base
/book-study review # Spaced repetition review
/book-study compare <book-A> <book-B> # Cross-book comparison
/book-study questions # View open questions
/book-study status # View all reading progress
Data Structure
Wiki defaults to book-wiki/ under the current project root.
book-wiki/
├── index.md # Global index: all books + cross-book concepts
├── log.md # Append-only operation log
├── <book-slug>/ # One directory per book
│ ├── meta.md # Book metadata (title, author, reading status)
│ ├── study-plan.md # Reading plan + progress tracking
│ ├── mastery-map.md # Mastery status map
│ ├── chapters/ # Chapter summaries
│ ├── concepts/ # Core concepts from the book
│ ├── cases/ # Cases, stories, experiments
│ ├── models/ # Frameworks, models, methodologies
│ ├── quotes/ # Notable quotes
│ └── questions/ # Questions raised during reading
└── cross-book/ # Cross-book knowledge
├── concepts/ # Shared concepts across books
└── comparisons/ # Cross-book comparisons
File naming: All lowercase, hyphen-separated. Book slug: book title in pinyin or English abbreviation (e.g. thinking-fast-and-slow).
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.
- 12d ago First seen · 350 lines · 121 tokens per session scan A c28931b30b5f
book-study is a skill published in the GitHub repository sanyuan0704/sanyuan-skills (3,906 stars, last pushed 4mo ago), licensed MIT. It adds 121 tokens to every session and 3,265 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 2026-08-30.
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