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PlugRail Japanese Calendar MCP Server

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PlugRail Japanese Calendar is answering right now. Last checked 9 min ago. It exposes 4 tools. Last commit 7 Oct 2026.

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

Uptime history 90 days of history · worst day 92%
90 days agonow
100.0%
Uptime 24h
91 of 91 checks
4
Tools
read from the server
670 ms
Response time
average over 24h
0
Stars
last commit 7 Oct 2026

What changed 4

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 7 October 2026. No other catalogue keeps this.

7 Oct 4 tools changed the parameters they ask for add_business_days, business_days_between, is_holiday and 1 more

PlugRail Japanese Calendar missed 2 checks this week

Everything else answered, so this is steady rather than shaky. We check every 15 minutes, which is how a one-off gets told apart from the start of a pattern, and how you hear about the next one within the hour instead of from your users.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 9 min ago.

run in your terminal
claude mcp add jp-calendar --transport http https://jp-calendar.plugrail.dev/mcp
Settings → Connectors → Add custom connector, then paste this address
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
{
  "servers": {
    "jp-calendar": {
      "type": "http",
      "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

URLTransportStateLatencyChecked
https://jp-calendar.plugrail.dev/mcp streamable-http answering 528 ms 9 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 670 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 in the form 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 670 ms on average, which is faster than 15% of all working MCP servers we measure. That is on the slow side — worth knowing if the tool sits inside an interactive loop. The comparison comes from our own checks across the whole registry, every 15 minutes.
Is PlugRail Japanese Calendar open source?
The code is open source: it is published under the MIT licence, written in TypeScript and 0 stars on GitHub. The licence covers the code in the repository, not the hosted service at jp-calendar.plugrail.dev, which runs on its operator's own terms.