The PlugRail Japanese Calendar MCP server,
connected in one click.
Japanese holiday and business-day calculations using official Japan Cabinet Office data. Connect the official PlugRail Japanese Calendar MCP server to Claude, ChatGPT, or Cursor through gate — one gateway URL, no config files, security-checked.
Free to start · No credit card · No hosting needed
Add PlugRail Japanese Calendar to your AI in one minute
Pick your client. Copy, paste, done — or let gate handle sign-ins and policies for you.
claude mcp add --transport http plugrail-japanese-calendar https://jp-calendar.plugrail.dev/mcpRun in your terminal, then restart Claude Code.
PlugRail Japanese Calendar · https://jp-calendar.plugrail.dev/mcp
What your AI can do with PlugRail Japanese Calendar
Real prompts you can type the moment it's connected — no setup, no docs to read.
“Use “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"}.”
“Use “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"}.”
“Use “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/.”
“Use “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.”
How secure is the PlugRail Japanese Calendar MCP server?
Every server in the gate directory has to pass the same four checks before your AI can touch it. Here's how PlugRail Japanese Calendar holds up.
Official endpoint
Operated by PlugRail Japanese Calendar (plugrail.dev) at its documented MCP endpoint — not a third-party mirror or community re-host.
No sign-in needed
This server only exposes public data — no account and no credentials are involved when you connect.
Scanned before it goes live
gate checks every tool for prompt injection, hidden instructions, data-exfiltration hints, and over-broad permissions before the server is available through your gateway.
Watched for drift
If PlugRail Japanese Calendar adds or changes tools later, gate re-scans and alerts you — before your AI acts on the change.
Connected in three steps
Connect your gate
Add one gateway URL to Claude, ChatGPT, or any MCP client. One-time setup, about two minutes.
Pick PlugRail Japanese Calendar
Choose PlugRail Japanese Calendar in the gate directory. No sign-in needed.
Use it anywhere
PlugRail Japanese Calendar's tools are live in every AI client you've connected — with rules and logging built in.
Free to start · No credit card · No hosting needed
The actual tools PlugRail Japanese Calendar exposes
Fetched live from the official endpoint and re-checked daily by gate — not marketing copy.
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"}
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"}
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/
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
Who runs the PlugRail Japanese Calendar MCP server?
The PlugRail Japanese Calendar MCP server at a glance
https://jp-calendar.plugrail.dev/mcpQuestions, answered
Is there an official PlugRail Japanese Calendar MCP server?
Yes — PlugRail Japanese Calendar operates its own remote MCP server at jp-calendar.plugrail.dev. gate connects you to that official endpoint and adds security scanning, per-tool access rules, and an activity log on top.
How do I connect PlugRail Japanese Calendar to Claude or ChatGPT?
Add gate's gateway URL to your AI client once, then pick PlugRail Japanese Calendar in the directory. No account or sign-in is needed. From then on, PlugRail Japanese Calendar's tools are available in every client you've connected to gate.
Do I need to host anything?
No. PlugRail Japanese Calendar runs the server, and gate is fully managed. You just connect one URL — there's nothing to install, deploy, or maintain.
Is the PlugRail Japanese Calendar MCP server safe to connect?
It's the vendor's official endpoint, and gate scans its tools for prompt injection and hidden instructions before it goes live, re-checks it whenever it changes, and lets you allow, block, or require approval for every single tool.
Is it free?
Yes — you can get started with gate for free and connect PlugRail Japanese Calendar in minutes. No credit card required.
Connect more than just PlugRail Japanese Calendar
Every server below works through the same gateway URL — connect once, add tools anytime.
Squarespace DomainsDesignView →Set up PlugRail Japanese Calendar in: Claude · Claude Code · ChatGPT · Cursor · VS Code
Give your AI PlugRail Japanese Calendar — safely.
One URL. All MCPs. Full control. Free to start.
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