jp.ossalt/jp-biz-tools

up checked 2026-11-12T13:37:58.096Z

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Publisher-provided title

Japan Business Tools

Publisher-provided description

Japanese holidays, business days, eras, postal codes, addresses and corporate numbers.

Summary by lookupd

Checks Japanese business days and holidays, converts eras, and looks up postal codes, addresses and corporate numbers.

Install

Claude Code, remote (streamable-http)

claude mcp add --transport http jp-biz-tools https://biz.ossalt.jp/mcp

Codex, remote (streamable-http)

codex mcp add jp-biz-tools --url https://biz.ossalt.jp/mcp

Cursor, remote (streamable-http) → .cursor/mcp.json

{
  "mcpServers": {
    "jp-biz-tools": {
      "url": "https://biz.ossalt.jp/mcp"
    }
  }
}

Other clients: docs. Or tell your agent: Set up lookupd for me: read https://lookupd.com/agent.md and follow it.

Tools (13 tools)

Publisher-provided text

• list_holidays List all Japanese national holidays and substitute holidays for a year, based on the National Holidays Act and verified against the Cabinet Office CSV. Each hol
• check_business_day Check whether a date is a business day in Japan, and if not, why (weekend, holiday name, bank closure, or a custom closed day). `reason` is Japanese text; `reas
• add_business_days Return the date that is N business days after (or before, if N is negative) the given date. The start date itself is not counted; e.g. 1 business day after a Fr
• count_business_days Count business days from start to end, inclusive of both ends. Returns 0 if start is after end. The period can be up to 3,660 days (about 10 years). / start から
• adjust_to_business_day If the date is a business day, return it as is; otherwise move to the next ("next") or previous ("previous") business day. Useful for payment due dates that fal
• last_business_day_of_month Return the last business day of the given month. / その月の最終営業日。
• to_japanese_era Convert a Gregorian date (YYYY-MM-DD) to the Japanese era calendar, e.g. 2026-10-07 → 令和8年10月7日 (wareki_short R8.10.07, zero-padded). Year 1 is written 元年. Supp
• from_japanese_era Convert a Japanese era date to YYYY-MM-DD. Accepts 令和8年10月7日, 令和元年5月1日, R8.10.7, H31/4/30, Reiwa 8.10.7, kanji numerals (昭和六十四年一月七日), a trailing weekday such as
• lookup_postal_code Look up the address (prefecture, city, town) for a 7-digit Japanese postal code, from Japan Post data. Accepts forms like 1000001, 100-0001 or 〒100-0001. One co
• search_postal_code Find Japanese postal codes by prefecture, city and (optionally) part of the town name, from Japan Post data. The city must be the full municipality name (e.g. 札
• normalize_address Split a Japanese address into prefecture, city, town and the rest (block numbers, building), matching Japan Post's address data, and return candidate postal cod
• lookup_corporate_number Look up a 13-digit Japanese corporate number (法人番号) in the National Tax Agency's monthly bulk data: name, furigana, English name, kind, registered address and p
• search_corporation_by_name Find Japanese corporations whose name starts with the given text (prefix match), in the National Tax Agency's monthly bulk data. Legal-form words such as 株式会社 o

Details

• Version: 0.9.0
• Transports: streamable-http
• Uptime (7 days): 100%
• Median latency: 249 ms
• First indexed: 2026-11-01T10:07:05.488Z
• Last seen in registry: 2026-11-01T10:07:05.563Z

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