io.github.mrslbt/rakuten-mcp

rakuten-mcp

A Model Context Protocol server for the Rakuten Web Service API. 27 read-only tools across six Rakuten product families: Ichiba (marketplace), Books, Travel, Recipe, Kobo, and GORA (golf).

Every tool description ships in English and Japanese. Every endpoint was re-verified against the live Rakuten API and its documentation on 2026-10-04.

Install

npm install -g rakuten-mcp

Or npx rakuten-mcp on demand.

Configuration

1. Register at Rakuten Web Service.
2. Create an application. You get a UUID Application ID and a pk_-prefixed Access Key.
3. Optional: register an Affiliate ID to monetize product links. Item URLs in tool responses will carry it.

IP allow list. A Rakuten app can restrict which IP addresses may call it. If your IP changes (new network, router restart), every tool fails with CLIENT_IP_NOT_ALLOWED; the server reports this as an IP problem, not a key problem. Fix it under Edit for the app at webservice.rakuten.co.jp/app/list. Servers and CI runners need their egress IP on the list too.

Claude Desktop

Edit claude_desktop_config.json:

{
  "mcpServers": {
    "rakuten": {
      "command": "npx",
      "args": ["-y", "rakuten-mcp"],
      "env": {
        "RAKUTEN_APP_ID": "your-app-id",
        "RAKUTEN_ACCESS_KEY": "your-access-key"
      }
    }
  }
}

Claude Code

claude mcp add rakuten -e RAKUTEN_APP_ID=... -e RAKUTEN_ACCESS_KEY=... -- npx -y rakuten-mcp

Cursor / Cline / Continue

Same JSON shape as Claude Desktop, under each client's MCP config path.

Tools

Ichiba (4)

ichiba_tag_search was removed in 1.3.0: Rakuten retired the Tag Search endpoint.

Books (9)

Only books_total_search takes free text. The per-category tools search by title / author / artist / JAN / ISBN / genre, because that is all Rakuten's endpoints accept.

Travel (7)

Recipe (2)

Kobo (2)

GORA (3)

Example queries

楽天で1万円以下のワイヤレスイヤホンを探して。レビュー4以上。
村上春樹の楽天Kobo電子書籍を新着順で。
東京駅近くのホテル、7月1〜2日、2名で1泊1万5千円以下の空室。
今週末東京近郊のゴルフ場で安いプランは？
楽天レシピで人気の鶏胸肉料理を5件、材料と所要時間込みで。
JANコード 4988601009447 のCDの取扱店舗。

Architecture

Modular: one file per API family under src/tools/. Stdio and HTTP transports both supported. Typed error tree with 9 classes covering Config / Auth / IpNotAllowed / RateLimit / Server / NotFound / BadRequest / MalformedResponse / Unknown. Retry-with-backoff on 429 and 5xx, parses Retry-After as both seconds and HTTP-date. See AGENTS.md for the architecture brief, conventions, and how to add a new tool.

Safety

All 27 tools are read-only HTTP GETs against the Rakuten Web Service API. No tool creates, modifies, or deletes anything. Rakuten's terms of service and rate limits apply. Returned items are promotional listings — verify prices and availability on Rakuten before acting on them.

Disclaimer

Unofficial. Not affiliated with, endorsed by, or sponsored by Rakuten Group, Inc. Rakuten, Rakuten Ichiba, Rakuten Books, Rakuten Travel, Rakuten Recipe, Rakuten Kobo, and Rakuten GORA are trademarks of Rakuten Group, Inc. Use at your own risk.

License

MIT