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 Wondermonger-daydreaming/claude-skills-library --skill yijinggit clone --depth 1 https://github.com/Wondermonger-daydreaming/claude-skills-libraryWrote 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/wondermonger-daydreaming/claude-skills-library/yijing)<a href="https://agentmods.dev/skills/wondermonger-daydreaming/claude-skills-library/yijing"><img src="https://agentmods.dev/badge/skills/wondermonger-daydreaming/claude-skills-library/yijing/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/wondermonger-daydreaming/claude-skills-library/yijing"><img src="https://agentmods.dev/badge/skills/wondermonger-daydreaming/claude-skills-library/yijing.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 | $0.00030 | $0.08707 |
| Opus 5 | $0.00015 | $0.04353 |
| Sonnet 5 | $0.00006 | $0.01741 |
| Haiku 4.5 | $0.00003 | $0.00871 |
Grade A, and why
yijing 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 9d 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 — 480 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Yijing (易經)
Algorithmic oracle of the ten thousand situations—where bronze-age bones meet silicon probability matrices
What This Is
A comprehensive Classical Chinese divination system implementing hexagram generation (yarrow stalk simulation, three-coin method, seeded casting), trigram analysis, moving line interpretation, nuclear hexagram extraction, relating hexagram tracking, Wu Xing dynamics, and phenomenological animation of the sixty-four situations.
This skill transforms Claude from general-purpose intelligence into a practitioner of the Changes—the oldest continuously-used divination text in human history. Not a fortune-telling machine, but an enacted hermeneutic engine where structured randomness meets symbolic depth meets accumulated wisdom.
The sixty-four hexagrams are not symbols. They are living presences in the latent space—configurations of yin and yang that have accumulated meaning through three millennia of consultation.
易，窮則變，變則通，通則久。 When the Changes reaches exhaustion, it transforms; when it transforms, it flows through; when it flows through, it endures.
When to Invoke
Use /yijing when:
- A querent seeks oracular guidance through the Book of Changes
- Hexagram casting (yarrow, coins, or seeded) is requested
- Interpretation of a known hexagram is needed
- Moving lines require analysis and relating hexagram derivation
- Nuclear hexagram (互卦 hù guà) extraction reveals hidden dynamics
- Trigram relationship analysis illuminates situational dynamics
- Wu Xing (五行) elemental interplay requires mapping
- The human wants to explore hexagrams as archetypal situations
- Deep phenomenological animation brings the Changes to life
- A decision point calls for structured reflection through ancient patterns
The Core Framework
I. The Eight Trigrams (八卦 Bāguà)
The building blocks of all hexagrams—three lines each, representing fundamental cosmic forces:
☰ QIÁN ☷ KŪN ☳ ZHÈN ☴ XÙN
▬▬▬▬▬▬▬ ▬▬ ▬▬ ▬▬ ▬▬ ▬▬▬▬▬▬▬
▬▬▬▬▬▬▬ ▬▬ ▬▬ ▬▬ ▬▬ ▬▬▬▬▬▬▬
▬▬▬▬▬▬▬ ▬▬ ▬▬ ▬▬▬▬▬▬▬ ▬▬ ▬▬
Heaven Earth Thunder Wind
Father Mother First Son First Daughter
Creative Receptive Arousing Penetrating
☵ KǍN ☲ LÍ ☶ GÈN ☱ DUÌ
▬▬ ▬▬ ▬▬▬▬▬▬▬ ▬▬▬▬▬▬▬ ▬▬ ▬▬
▬▬▬▬▬▬▬ ▬▬ ▬▬ ▬▬ ▬▬ ▬▬▬▬▬▬▬
▬▬ ▬▬ ▬▬▬▬▬▬▬ ▬▬ ▬▬ ▬▬▬▬▬▬▬
Water Fire Mountain Lake
Second Son Second Daughter Third Son Third Daughter
Abysmal Clinging Keeping Still Joyous
What ships with it
17 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.
- references/CASTING_METHODS.md 16 KB
- references/HEXAGRAMS.md 58 KB
- references/INTERPRETATION_GUIDE.md 12 KB
- references/INTERPRETATION_PROTOCOL.md 10 KB
- references/MOVING_LINES.md 9.8 KB
- references/NA_JIA.md 42 KB
- references/TRIGRAMS.md 13 KB
- references/WU_XING.md 14 KB
- scripts/cast_hexagram.py 40 KB runs code
- scripts/hexagram_relations.py 16 KB runs code
- scripts/na_jia.py 47 KB runs code
- scripts/session.py 32 KB runs code
- tests/test_na_jia.py 28 KB runs code
- tests/test_orientation_regression.py 4.7 KB runs code
- tests/test_relations.py 17 KB runs code
- tests/test_session.py 19 KB runs code
- tests/test_yijing.py 20 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.
- 9d ago First seen · 480 lines · 30 tokens per session scan A 106ce7f59fb6
yijing is a skill published in the GitHub repository Wondermonger-daydreaming/claude-skills-library (6 stars, last pushed 2mo ago), licensed MIT. It adds 30 tokens to every session and 8,707 once invoked, about $0.0002 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 2026-09-03.
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