japan-mcp-servers

MCP servers for Japanese services. LINE, Rakuten, freee, with more on the way.

These servers implement the Model Context Protocol so that AI assistants (Claude, Cursor, VS Code Copilot, etc.) can actually talk to the services that run Japan's digital infrastructure.

| Package | Service | What it does | |---------|---------|-------------| | `@japan-mcp/line` | LINE Messaging | Send messages, manage groups, rich menus, analytics | | `@japan-mcp/rakuten` | Rakuten Ichiba / Books / Travel | Product search, rankings, book search, hotel availability | | `@japan-mcp/freee` | freee Accounting | Transactions, P&L, trial balance, partners |

git clone https://github.com/mrslbt/japan-mcp-servers.git
cd japan-mcp-servers
npm install
npm run build

Then add whichever servers you need to your MCP client config. Here's Claude Desktop (claude_desktop_config.json):

{
  "mcpServers": {
    "line": {
      "command": "node",
      "args": ["/absolute/path/to/servers/line-mcp/dist/index.js"],
      "env": {
        "LINE_CHANNEL_ACCESS_TOKEN": "your-token"
      }
    },
    "rakuten": {
      "command": "node",
      "args": ["/absolute/path/to/servers/rakuten-mcp/dist/index.js"],
      "env": {
        "RAKUTEN_APP_ID": "your-app-id",
        "RAKUTEN_ACCESS_KEY": "your-access-key"
      }
    },
    "freee": {
      "command": "node",
      "args": ["/absolute/path/to/servers/freee-mcp/dist/index.js"],
      "env": {
        "FREEE_ACCESS_TOKEN": "your-token",
        "FREEE_COMPANY_ID": "your-company-id"
      }
    }
  }
}

Each server validates credentials on startup. You'll know immediately if something's missing.

Once configured, you can ask your AI assistant things like:

LINEグループにミーティングのリマインダーを送って
楽天で1万円以下のワイヤレスイヤホンを検索して
今月の経費をfreeeに登録して
楽天トラベルで京都の空室を探して
freeeの損益計算書を見せて