Search products on Rakuten Ichiba (Japan's largest e-commerce marketplace) by keyword. Supports price range filtering, sorting by review count/average/price, and restricting results to a specific genre or shop. Returns items with prices, review stats, images, purchase URLs, quantity, unitPrice, postageLabel (from postageFlag), estimatedTotalPrice, and shippingVerified. For cheapest / per-unit / shipping-inclusive comparisons (送料込み, コスパ, 安い順, 最安): use the compare_ichiba_value PROMPT instead of this tool alone. If you must use this tool directly: (1) pre-sort by unitPrice ascending; (2) shippingVerified=true → estimatedTotalPrice is final; (3) web-search top 3–5 shippingVerified=false items for JPY shipping; (4) re-rank by itemPrice+shipping; never guess shipping.

[JA] 楽天市場で商品をキーワード検索します。各商品にquantity・unitPrice・postageLabel・estimatedTotalPrice・shippingVerifiedを付与します。送料込み・コスパ・安い順・最安の比較は compare_ichiba_value プロンプトを使うこと(このツール単体は不十分)。直接使う場合: (1) unitPrice昇順 (2) shippingVerified=trueは確定 (3) false上位3〜5件をウェブ検索 (4) 再ソート。送料推測禁止。

Browse the Rakuten Ichiba genre (category) hierarchy. Pass '0' to list top-level genres, or a specific genre ID to fetch its ancestors, siblings, and direct children. Useful for narrowing item searches to a specific category, or for discovering what categories exist.

[JA] 楽天市場のジャンル(カテゴリ)階層を参照します。'0' を渡すとトップレベル、特定のジャンルIDを渡すと祖先・兄弟・直下の子ジャンルを取得します。商品検索を特定カテゴリに絞り込んだり、カテゴリ構造を発見するのに使えます。

Look up details for a specific Rakuten Ichiba tag by tag ID. Tags are facet-style attributes (size, color, etc.) attached to items. Returns the tag group this tag belongs to, the tag name, and any parent tag. Tag IDs surface in ichiba_item_search item responses (each item carries an attributeIds array) and in ichiba_genre_search.

[JA] 特定のタグIDの詳細を取得します。タグはファセット属性(サイズ、色など)で商品に紐づいています。タグ名、所属タググループ、親タグを返します。タグIDは ichiba_item_search の各商品 attributeIds や ichiba_genre_search から取得できます。

Get the Rakuten Ichiba bestseller ranking — overall or filtered by genre, time period, age, and gender demographic. Returns ranked items with rank, price, review stats, purchase URL, quantity, unitPrice, postageLabel, estimatedTotalPrice, and shippingVerified. Use ichiba_genre_search to find genre IDs. For cheapest / per-unit / shipping-inclusive comparisons (送料込み, コスパ, 安い順, 最安): use the compare_ichiba_value PROMPT instead of this tool alone. If you must use this tool directly: (1) pre-sort by unitPrice ascending; (2) shippingVerified=true → estimatedTotalPrice is final; (3) web-search top 3–5 shippingVerified=false items for JPY shipping; (4) re-rank by itemPrice+shipping; never guess shipping.

[JA] 楽天市場の売れ筋ランキングを取得します。quantity・unitPrice・postageLabel・estimatedTotalPrice・shippingVerifiedを含みます。送料込み・コスパ・安い順・最安の比較は compare_ichiba_value プロンプトを使うこと(このツール単体は不十分)。直接使う場合: (1) unitPrice昇順 (2) shippingVerified=trueは確定 (3) false上位3〜5件をウェブ検索 (4) 再ソート。送料推測禁止。

Search Rakuten's Item Price Navi — cross-seller product catalogue that groups identical products across multiple shops. Returns each product with its min/max/average price across all sellers and the total number of shops carrying it. Use this (instead of ichiba_item_search) when you want to compare prices for a specific product or answer 'is this a fair price?'. Filter by maker_code to restrict to a brand.

[JA] 楽天市場の商品価格ナビを検索します。同一商品を複数店舗にまたがって集約し、最安値/最高値/平均価格と取扱店舗数を返します。特定商品の価格比較や「妥当な価格か?」を判断する用途では、ichiba_item_search ではなくこちらを使用してください。maker_code でブランド絞り込みも可能。