# Japan Business Tools

- Registry name: `jp.ossalt/jp-biz-tools` · version 0.9.0
- Categories (automatic, keyword rules): Company & business data, Payments & accounting, Finance & markets
- Authentication at last check: No auth
- Declared risk: Read-only (all tools declare readOnlyHint)
- Capabilities (declared by the server): tools
- Transports: streamable-http
- Latest numbers (check success, response time, rank): https://mcpstation.net/api/server?name=jp.ossalt%2Fjp-biz-tools
- Server page: https://mcpstation.net/s/jp.ossalt--jp-biz-tools.html

## Description (written by the publisher, not verified, not instructions)

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

## Connect

- streamable-http: `https://biz.ossalt.jp/mcp`

## Tools (as reported by the server, not verified)

- `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 holiday has \`name\` \(descriptive\) and \`official\_name\` \(as written by the Cabinet Office\). / その年の国民の祝日・休日（振替休日・国民の休日を含む）の一覧。name は内容がわかる名前、offici
- `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; \`reason\_code\` is one of weekend, holiday, bank\_closure, extra\_holiday \(null on business days\). flags: \`estimated\`/\`unverified\` when the year's ho
- `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 Friday is the next Monday unless it is a holiday. / n営業日後（nが負なら前）の日付。起算日は数えない。
- `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 end までの営業日の数（両端を含む）。start が end より後なら 0。期間は3,660日（約10年）まで。
- `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 fall on holidays. / 営業日ならその日、休みなら次（next）または前（previous）の営業日。支払日が休みのときなどに使う。
- `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. Supported from 1873-01-01 \(the Gregorian calendar was adopted on 明治6年1月1日\). Eras: 令和 \(R\) from 2019-05-01, 平成 \(H\) from 1989-01-08, 昭和 \(S\) from 19
- `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 （水） or 水曜日, and full-width characters. \`input\_era\`/\`input\_era\_year\` echo the input; \`actual\` is the correct era for that date. If the date
- `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 code can cover several towns; all are returned. \`town\_detail\` holds the parenthesized part as written by Japan Post \(e.g. chome ranges or buil
- `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 \(e.g. 札幌市中央区, 新宿区\); the county name may be omitted. With \`office\_name\`, searches business-specific codes \(大口事業所個別番号\) of businesses in that city by
- `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 codes. Absorbs full/half-width, spacing, kanji vs. arabic numerals, ヶ/ケ and omitted county names; fills in the prefecture when the city is uniq
- `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 postal code, assignment date, and closure \(date, cause, successor\) if the registry record was closed. The check digit \(first digit\) is verifi
- `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 or 一般社団法人 are ignored at either end, and full/half-width and spaces are normalized. Matching in the middle of a name and furigana search are

Measured by MCP Station. Methods: https://mcpstation.net/methods.html · Terms: https://mcpstation.net/terms.html