dev.omikuji/holiday·Productivity

Japan Public Holidays

Japanese national holidays, substitute holidays, business days and long weekends (Cabinet Office).

Connect

remote

Terminal

$claude mcp add --transport http holiday https://holiday.omikuji.dev/mcp

Nothing to configure — it works as is.

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check_dates
For each date, tell whether it is a Japanese national holiday (with name and kind: 祝日 / 振替休日 / 国民の休日), a weekend, and a business day. Also returns today in Japan time. Use this instead of guessing weekdays or holidays.
list_holidays
List Japanese national holidays for a year, or between from and to. With no arguments, lists the next 10 holidays from today (Japan time).
business_days
Count business days between start and end (inclusive), or find the date that is N business days after start (add=N; negative N goes backward; start itself is not counted). Business day = weekday that is not a national holiday. Set year_end_closed to also skip 12/29-1/3.
find_long_weekends
Find 連休 (3+ consecutive days off made of weekends and national holidays), e.g. Golden Week, Silver Week. Give a year, or from (default today) to list upcoming ones.