MCP server

Japan Business Tools

jp.ossalt/jp-biz-tools

Checked 28 Oct 2026, 09:03 UTC · Connected to it and listed its tools

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

At a glance

Type

MCP server

Publisher

ossalt.jp (verified by the MCP Registry)

Status

Working at last check

Tools

13

Token cost

About 4,044 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

28 Oct 2026, 09:03 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

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

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.jp-biz-tools]
url = "https://biz.ossalt.jp/mcp"

Gemini CLI

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

Cursor

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

VS Code

{"servers":{"jp-biz-tools":{"type":"http","url":"https://biz.ossalt.jp/mcp"}}}

Antigravity

agy mcp add jp-biz-tools https://biz.ossalt.jp/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"jp-biz-tools","server_url":"https://biz.ossalt.jp/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"jp-biz-tools","server_url":"https://biz.ossalt.jp/mcp"}

Tools

• add_business_days ~396 tokens
  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。
• adjust_to_business_day ~394 tokens
  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。
• check_business_day ~409 tokens
  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
• count_business_days ~388 tokens
  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。
• from_japanese_era ~268 tokens
  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
• last_business_day_of_month ~327 tokens
  Return the last business day of the given month. / その月の最終営業日。
• list_holidays ~157 tokens
  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
• lookup_corporate_number ~277 tokens
  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
• lookup_postal_code ~225 tokens
  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
• normalize_address ~329 tokens
  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
• search_corporation_by_name ~361 tokens
  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
• search_postal_code ~295 tokens
  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
• to_japanese_era ~218 tokens
  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

Browse

• Monday tools
• Spreadsheets
• Calendars
• Payments
• Invoicing and accounting

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