MCP server

PlugRail Japanese Calendar Official

dev.plugrail/jp-calendar

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

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

Working at last checkVerified publisher: plugrail.devAbout 824 tokens per request once connected4 tools

Website Source

https://jp-calendar.plugrail.dev/mcp

At a glance

Type: MCP server
Publisher: plugrail.dev (verified by the MCP Registry)
Status: Working at last check
Tools: 4
Token cost: About 824 tokens per request
Sets up in: Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok
Last checked: 26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to Cursor Add to VS Code VS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

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

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

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

Gemini CLI

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

Cursor

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

VS Code

{"servers":{"jp-calendar":{"type":"http","url":"https://jp-calendar.plugrail.dev/mcp"}}}

Antigravity

agy mcp add jp-calendar https://jp-calendar.plugrail.dev/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"jp-calendar","server_url":"https://jp-calendar.plugrail.dev/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"jp-calendar","server_url":"https://jp-calendar.plugrail.dev/mcp"}

Tools

add_business_days ~254 tokens
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 ~323 tokens
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
is_holiday ~91 tokens
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 ~156 tokens
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"}

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