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

Connect Remote server

claude mcp add --transport http mcp https://mahjonghandbook.com/api/mcp

{
  "mcpServers": {
    "mcp": {
      "url": "https://mahjonghandbook.com/api/mcp"
    }
  }
}

{
  "servers": {
    "mcp": {
      "type": "http",
      "url": "https://mahjonghandbook.com/api/mcp"
    }
  }
}

Settings > Connectors > Add custom connector
URL: https://mahjonghandbook.com/api/mcp

Tools 4 found in our last check

• 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) across American, Chinese MCR, Japanese Riichi, and Hong Kong Mahjong. Do not use for Charleston passing steps, NMJL Joker meld legality, or Riic…

• 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 first discard in American Mahjong.

• 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 live-turn swap rules.

• 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 condition independent of Dora.

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