A digital version of the I Ching, an ancient Chinese system that uses 64 symbolic hexagrams to reflect on situations and change.

Use it to cast and interpret I Ching readings with coins, yarrow-stalk simulation, or seeded results.

It provides a structured way to explore a question through generated hexagrams, changing lines, and traditional interpretations.

yijing — Skill for Claude Code and Codex by Wondermonger-daydreaming

Install

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.

Any agent

npx skills add Wondermonger-daydreaming/claude-skills-library --skill yijing

Clone the repo

git clone --depth 1 https://github.com/Wondermonger-daydreaming/claude-skills-library

Made for: Claude Code, Codex.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/wondermonger-daydreaming/claude-skills-library/yijing/github.svg)](https://agentmods.dev/skills/wondermonger-daydreaming/claude-skills-library/yijing)

Your own site

<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.

Your own site · 80×15

<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>

Per session 30 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 8,707 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

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 5.5	$0.00012	$0.03483
Sonnet 5.5	$0.00006	$0.01741
Haiku 4.5	$0.00003	$0.00871

Measured 1mo ago against content hash 106ce7f59fb6, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

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 1mo ago.

The scan reads SKILL.md. This mod also ships 9 executable files (scripts/cast_hexagram.py, scripts/hexagram_relations.py, scripts/na_jia.py, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

skills/yijing/SKILL.md · 480 lines

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

Read the full file on GitHub · 480 lines

Files

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.

Changes

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.

1mo ago First seen · 480 lines · 30 tokens per session scan A 106ce7f59fb6

Subscribe to this mod's changes

yijing is a skill published in the GitHub repository Wondermonger-daydreaming/claude-skills-library (7 stars, last pushed 18d ago), licensed MIT. It adds 30 tokens to every session and 8,707 once invoked, about $0.0001 per session on Opus 5.5. 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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