MCP Radar
MCP Server

yarrow

io.github.shaozhengkun123/yarrow
Other Public & reachable MCP 2026-07-28

What this MCP does

Provides I-Ching and Tarot casts, classical source lookups, and reflective readings in multiple languages.

Capabilities

Tools

7 tools
cast_hexagram
Cast a hexagram for an I-Ching consultation. Returns the primary hexagram, the six lines (6=old yin, 7=young yang, 8=young yin, 9=old yang from bottom to top), any moving lines, and the changing hexagram if there are moving lines. Pass `seed` to make the cast deterministic (useful for testing or for reproducing a reading).
Input schema 
{'type': 'object', 'required': [], 'properties': {'seed': {'type': ['string', 'number'], 'description': 'Optional seed for deterministic casting.'}, 'method': {'enum': ['coins', 'yarrow', 'random'], 'type': 'string', 'default': 'coins', 'description': 'coins = three-coin toss (most common); yarrow = traditional 50-stalk probabilities; random = uniformly pick one of the 64 hexagrams with no moving lines.'}, 'question': {'type': 'string', 'description': 'The question being asked (not used for casting, returned in result for context).'}}}
cast_tarot
Draw one upright Major Arcana card for reflection. Uses a deterministic one-card Waite-Smith Major Arcana method and returns a selected source excerpt from Arthur Edward Waite's public-domain 1910/1922 text. Pass `seed` to reproduce the same draw.
Input schema 
{'type': 'object', 'required': [], 'properties': {'seed': {'type': ['string', 'number'], 'description': 'Optional deterministic draw seed.'}, 'question': {'type': 'string', 'description': 'The question being reflected on (not used to influence the draw).'}}}
divine
Ask the I Ching. See your next step. Cast a hexagram, show the classical sources first, then offer a thoughtful reflection grounded in those sources. Sources first. Reflection, not prediction. The divine name remains stable for oracle/divination client compatibility. Supports English, Chinese, Japanese, Korean, Spanish, French, German, Portuguese, Italian, Russian, Arabic, Hindi, Indonesian, and English+Chinese bilingual output. Daily quota: 30 completed readings per device_id (or per anonymous IP if no device_id is supplied); timeout, provider failure, incomplete response, and cancellation do not consume it.
Input schema 
{'type': 'object', 'required': ['question'], 'properties': {'seed': {'type': ['string', 'number'], 'description': 'Deterministic cast seed.'}, 'locale': {'enum': ['en', 'zh', 'zh-Hant', 'ja', 'ko', 'es', 'fr', 'de', 'pt', 'it', 'ru', 'ar', 'hi', 'id', 'bilingual'], 'type': 'string', 'default': 'en'}, 'method': {'enum': ['coins', 'yarrow', 'random'], 'type': 'string', 'default': 'coins'}, 'question': {'type': 'string', 'description': 'The question to consult on.'}, 'device_id': {'type': 'string', 'description': 'Optional opaque identifier for quota tracking. If omitted, IP-derived.'}}}
lookup_hexagram
Return the full classical sources for a hexagram by its number (1–64): judgment (卦辞), image (大象), Tuan commentary, Zhu Xi 周易本义, Yang Tian Cai modern explanation, Yarrow's separately labelled Chinese reading aid, and historical anecdote — with available Chinese and English source material.
Input schema 
{'type': 'object', 'required': ['number'], 'properties': {'locale': {'enum': ['en', 'zh', 'both'], 'type': 'string', 'default': 'both'}, 'number': {'type': 'integer', 'maximum': 64, 'minimum': 1, 'description': 'Hexagram number 1-64 in King Wen sequence.'}, 'compact': {'type': 'boolean', 'default': False, 'description': 'If true, omit authorities (long classical commentary). Returns only structural fields.'}}}
lookup_yilin
Look up the 焦氏易林 verse for a primary hexagram changing into another hexagram. This is a local classical-source lookup, not an AI reading.
Input schema 
{'type': 'object', 'required': ['primary_number', 'changing_number'], 'properties': {'primary_number': {'type': 'integer', 'maximum': 64, 'minimum': 1, 'description': 'Primary hexagram number 1-64.'}, 'changing_number': {'type': 'integer', 'maximum': 64, 'minimum': 1, 'description': 'Changing hexagram number 1-64.'}}}
tarot_reading
Ask one real question through a single upright Waite-Smith Major Arcana card. Returns a direct calibrated answer first, the named card and bound Arthur Edward Waite 1910 source excerpt, a practical reality check, and one observable next step. No reversals, astrology, redraw loop, or guaranteed prediction. Daily quota is shared with completed divine and Two Lenses readings.
Input schema 
{'type': 'object', 'required': ['question'], 'properties': {'seed': {'type': ['string', 'number'], 'description': 'Deterministic Tarot draw seed.'}, 'locale': {'enum': ['en', 'zh', 'zh-Hant', 'ja', 'ko', 'es', 'fr', 'de', 'pt', 'it', 'ru', 'ar', 'hi', 'id', 'bilingual'], 'type': 'string', 'default': 'en'}, 'question': {'type': 'string', 'description': 'The real question to reflect on.'}, 'device_id': {'type': 'string', 'description': 'Optional opaque identifier for quota tracking. If omitted, IP-derived.'}}}
two_lenses
Bring one real question to two independent symbolic traditions: a source-first I-Ching cast and one upright Waite-Smith Major Arcana card. Returns a clear calibrated answer first, then five grounded sections covering the I Ching lens, Tarot lens, shared themes, different emphasis, and next step. Direction without guaranteed prediction or mutual-confirmation claims. Daily quota is shared with completed divine readings.
Input schema 
{'type': 'object', 'required': ['question'], 'properties': {'locale': {'enum': ['en', 'zh', 'zh-Hant', 'ja', 'ko', 'es', 'fr', 'de', 'pt', 'it', 'ru', 'ar', 'hi', 'id', 'bilingual'], 'type': 'string', 'default': 'en'}, 'method': {'enum': ['coins', 'yarrow', 'random'], 'type': 'string', 'default': 'coins'}, 'question': {'type': 'string', 'description': 'The same real question for both lenses.'}, 'device_id': {'type': 'string', 'description': 'Optional opaque identifier for quota tracking. If omitted, IP-derived.'}, 'tarot_seed': {'type': ['string', 'number'], 'description': 'Deterministic Tarot draw seed.'}, 'iching_seed': {'type': ['string', 'number'], 'description': 'Deterministic I-Ching cast seed.'}}}
History

Recent tool changes

Added
two_lenses
Sept. 17, 2026, 12:52 p.m.
Added
tarot_reading
Sept. 17, 2026, 12:52 p.m.
Added
divine
Sept. 17, 2026, 12:52 p.m.
Added
cast_tarot
Sept. 17, 2026, 12:52 p.m.
Added
lookup_yilin
Sept. 17, 2026, 12:52 p.m.
Added
lookup_hexagram
Sept. 17, 2026, 12:52 p.m.
Added
cast_hexagram
Sept. 17, 2026, 12:52 p.m.
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