japan-holiday-mcp

Get Japanese national holidays and substitute holidays from the Cabinet Office (内閣府).

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What it can do

  • Ping: Test connectivity to the Japan Holiday MCP server and confirm it is running.
  • Is Holiday: Check whether a given date is a Japanese national holiday or substitute holiday. Returns the holiday name if it is one.
  • Get Holidays In Month: List all Japanese national holidays and substitute holidays in a given year and month.

What data it sees

Do you need an account

No: the server works without sign-in

Get Japanese national holidays and substitute holidays from the Cabinet Office (内閣府). Check if a date is a holiday, list holidays by month, or get upcoming holidays. No API key required.

How to connect

How to connect japan-holiday-mcp to Claude

The server address to paste into Claude settings:

https://japan-holiday-mcp--kakar-satoshi.run.tools

  1. Open Claude (claude.ai or the desktop app).
  2. Go to Settings → Connectors.
  3. Click Add custom connector.
  4. Paste the server address copied below into Remote MCP server URL and click Add.
  5. In a chat, click + → Connectors and switch the new connector on.

Custom connectors are available on Free, Pro, Max, Team and Enterprise plans (Free is limited to one). On Team and Enterprise an organization Owner adds the connector first under Organization settings → Connectors.

Authorization

After you click Add, a sign-in window for the service opens. Sign in with your own account and approve access. Claude never sees your password.

How to connect japan-holiday-mcp to ChatGPT

The server address to paste into ChatGPT settings:

https://japan-holiday-mcp--kakar-satoshi.run.tools

  1. Open ChatGPT in a browser (chatgpt.com). A Plus, Pro, Business, Enterprise or Edu plan is required.
  2. Turn on developer mode once: Settings → Apps → Advanced settings → Developer mode.
  3. Open Settings → Connectors and click Create.
  4. Fill in the form: Name (anything), Description (one line about what the service does), MCP server URL (copy it below).
  5. Under Authentication choose OAuth if the service requires sign-in, otherwise None. Click Create.
  6. In a new chat open + → Apps/Connectors and enable the connector.

OpenAI has renamed this section before (Connectors → Apps/Plugins). If the label differs, search settings for "developer mode". On Business/Enterprise workspaces an admin must allow custom connectors first.

Authorization

On first use ChatGPT opens the service's sign-in window. Sign in and approve access.

How to connect japan-holiday-mcp to Cursor

The server address to paste into Cursor settings:

https://japan-holiday-mcp--kakar-satoshi.run.tools

Fastest: click Open in Cursor below and confirm the prompt.

Manually:

  1. In Cursor open Settings → Cursor Settings → MCP and click Add new global MCP server.
  2. Paste the JSON copied below into ~/.cursor/mcp.json (per project: .cursor/mcp.json in the repo root).
  3. Save the file. The server appears in the MCP list; authorize it there if asked.

Authorization

If the service needs sign-in, an authorize button appears next to the server in the MCP list.

Server tool list (4)

Raw names from tools/list. Only developers need these.

pingTest connectivity to the Japan Holiday MCP server and confirm it is running.
is_holidayCheck whether a given date is a Japanese national holiday or substitute holiday. Returns the holiday name if it is one.
get_holidays_in_monthList all Japanese national holidays and substitute holidays in a given year and month.
get_next_holidaysGet the next N upcoming Japanese national holidays from today (Japan Standard Time). Includes how many days until each holiday.