PlugRail Japanese Calendar MCP Server

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answering

PlugRail Japanese Calendar is answering right now. Last checked 11 min ago. It exposes 4 tools. Last commit 11 Jul 2026.

Japanese holiday and business-day calculations using official Japan Cabinet Office data.

Uptime history 47 days of history

47 days agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

485 ms

Response time

average over 24h

Stars

last commit 11 Jul 2026

Nothing serious here today

Today is the operative word: we check PlugRail Japanese Calendar every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 11 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add jp-calendar --transport http https://jp-calendar.plugrail.dev/mcp

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "jp-calendar": {
      "url": "https://jp-calendar.plugrail.dev/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.jp-calendar]
url = "https://jp-calendar.plugrail.dev/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "jp-calendar": {
      "url": "https://jp-calendar.plugrail.dev/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "jp-calendar": {
      "url": "https://jp-calendar.plugrail.dev/mcp"
    }
  }
}

Available tools 4

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

business

add_business_days

指定した日付(date)の翌日から数えてN営業日目(days)の日付を返します。dateの当日は数えません。daysが負の場合は過去方向（dateの前日から遡ってN営業日目）に計算します。土日・日本の祝日を除外し、calendar="banking"を指定すると銀行休業日（12/31〜1/3）も除外します。dateが営業日かどうかだけ知りたい場合は is_holiday を使ってください（days=0でも同じ情報がskipped経由で得られます）。入力例: {"date": "2026-07-10", "days": 3}

business_days_between

from〜to間の営業日数を数えます。既定では「fromを含まず、toを含む」境界です（例:「今日から支払期日まで何営業日か」）。include_from/include_toで境界を変更できます。土日・日本の祝日を除外し、calendar="banking"を指定すると銀行休業日（12/31〜1/3）も除外します。from > to の場合はエラーにせず、from/toとinclude_from/include_toを入れ替えて計算した結果の符号を反転した値（負の営業日数）を返します（反対称則: count(A,B,x,y) = -count(B,A,y,x)。A≠B、すなわちfrom≠toの場合に成立する恒等式で、from===toはこの分岐に入らないため対象外）。入力例: {"from": "2026-07-10", "to": "2026-07-20"}

holiday

is_holiday

指定した日付が日本の祝日（国民の祝日・休日）かどうかを判定します。内閣府公表データに基づきます。入力例: {"date": "2026-01-01"}

holidays

list_holidays

指定した年または期間の日本の祝日一覧を返します。入力例: {"year": 2026} または {"from": "2026-01-01", "to": "2026-06-30"}

Endpoints

URL	Transport	State	Latency	Checked
https://jp-calendar.plugrail.dev/mcp	streamable-http	answering	650 ms	11 min ago

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PlugRail Japanese Calendar — questions

Answers built from our own checks of this server.

What can PlugRail Japanese Calendar do?

It exposes 4 tools, read directly from the server on our last check. Among them: add_business_days, business_days_between, is_holiday, list_holidays. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is PlugRail Japanese Calendar working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 485 ms. The bar chart above shows every period we have measured.

How do I connect PlugRail Japanese Calendar?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does PlugRail Japanese Calendar need an API key?

No. PlugRail Japanese Calendar completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 4 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is PlugRail Japanese Calendar?

It answers our handshake in 485 ms on average, which is faster than 30% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is PlugRail Japanese Calendar open source?

Yes — it is published under the MIT licence, written in TypeScript and 0 stars on GitHub. The source link is on this page, so you can read exactly what it does with your data before you connect it.