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MahjongHandbook — American NMJL, MCR & Riichi Mahjong Scoring Rules Engine

MCP serverVerified domain · mahjonghandbook.comRemote● LiveFree to try

Query American NMJL, Chinese Official MCR (81 Fan) & Japanese Riichi Mahjong scoring rules.

Install

Remote server: your requests and data go to mahjonghandbook.com. Claude Code: claude mcp add --transport http mahjonghandbook-american-nmjl-mcr-riichi https://mahjonghandbook.com/api/mcp · Claude app: Settings → Connectors → Add custom connector.

What it can do

The tools this server listed when we connected to it, in its own words.

  • lookup_mahjong_scoring_rules — Compare high-level regional ruleset structures (tile deck size 136 vs 144 vs 152, hand length, and minimum Fan/point entry thresholds) acros
  • lookup_american_charleston_sequence — Retrieve exact pre-game tile passing directions (Right, Across, Left), blind pass rules, and Courtesy Pass negotiation steps prior to the fi
  • check_nmjl_joker_legality — Validate whether an American Mahjong Joker tile can legally substitute inside a specific meld size (1 to 6 tiles) and retrieve exposed Joker
  • check_riichi_furiten_and_yaku — Evaluate Japanese Riichi Mahjong discard/temporary Furiten Ron restrictions and verify whether a hand satisfies the mandatory 1-Yaku win con

KitScout test notes

Not tested by KitScout yet. When our harness runs it, pros, cons and the tasks we tried appear here, with the date and evidence.

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