I Ching MCP server

@pipeworx/i-ching

Cast the I Ching with the traditional three-coin or yarrow-stalk method, or look up any of the 64 hexagrams (King Wen sequence) directly. Every hexagram's judgment, image and six line texts are original text written for this pack.

Part of Pipeworx — an MCP gateway connecting AI agents to 1866+ live data sources. This is an independent, unofficial integration — not affiliated with, endorsed by, or published by the upstream provider.

Tools

default, or yarrow), returns the primary hexagram, any changing lines with their texts, and the resulting hexagram after those lines flip (null if none changed). seed is always returned at the top level of the result; pass it back with the same method to replay the exact cast. meta carries the shared chance-engine envelope (seed, procedure, deck, source) for citation, matching the convention used across this pack family (e.g. dice-roller). question is echoed back verbatim and never interpreted — the calling agent reads the hexagram and line texts and draws its own conclusion.

• castiching({ method?, question?, seed? }) — casts six lines (coins by

number (1-64) or by name (Chinese, pinyin, or the English gloss used here).

• get_hexagram({ number?, name? }) — full text for one hexagram by King Wen

(e.g. "thunder", "patience", "withdrawal"); returns short summaries, use get_hexagram for the full text of a match.

• search_hexagrams({ query }) — free-text search over names and keywords

Auth

Keyless. No upstream, no API key, no COGS.

Content and sourcing

All 64 hexagrams are inline in this pack (src/hexagrams.ts, ~70 KB — well under the 150 KB threshold where content moves to KV per workers/gateway/src/pack-baked-indexes.json).

the six binary lines (bottom to top; a line is yang/solid or yin/broken) and their trigram composition are traditional, structural facts reproduced across every edition of the text — not any translator's copyrighted expression.

• The King Wen hexagram number, the Chinese name, the pinyin romanization, and

are original wording, written for this pack. James Legge's 1899 translation ("The Yi King", Sacred Books of the East vol. 16) is the public-domain reference used for the underlying meaning of each hexagram and line. This pack never reproduces Wilhelm/Baynes ("The I Ching or Book of Changes", still under copyright) or any other modern commercial translation's wording.

• The English hexagram name, the judgment, the image, and all six line texts

probabilities (1/16, 5/16, 7/16, 3/16) are the standard, well-documented results of each traditional counting method, not anyone's expression.

• Coin-toss probabilities (6/7/8/9 at 1/8, 3/8, 3/8, 1/8) and yarrow-stalk

question. Every tool description says this, so the result reads as structured material to reason over, not as advice delivered by the tool.

• Meanings are traditional; the calling agent interprets them for its own

Randomness

Real randomness via the shared chance engine (@pipeworx/shared's makeRng/rollWeighted), not a model pretending to cast coins. seed is optional on castiching and always returned, so the same seed and method reproduce the same cast exactly. No session/deck-draw state is used here — unlike the tarot or random-tables packs, a cast is a single self-contained roll of six independent lines each time, so there is nothing to carry across calls and this pack does not request KV injection.

Errors

A hexagram number outside 1-64, a name that matches nothing, or a search query with no matches are all loud errors naming the valid range or offering examples/keywords to try — never a silent empty result.

Quick Start

Add to your MCP client (Claude Desktop, Cursor, Windsurf, etc.):

{
  "mcpServers": {
    "i-ching": {
      "url": "https://gateway.pipeworx.io/i-ching/mcp"
    }
  }
}

What this endpoint actually serves

Shortened. The full README is on GitHub.