PlugRail Japanese Calendar MCP MCP server

PlugRail's official MCP server that provides Japanese holiday and business day calculations based on official Cabinet Office data. It allows AI agents to determine if a date is a holiday, calculate business days, and verify operating days for Japan.

Endpoint and access

No sign-in: your client connects and lists tools immediately, with no account or key.

No sign-inEndpoint checked 2026-10-05Operated by plugrail

MCP endpoint (Streamable HTTP)

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

Vendor documentation

What you can do with it

Determine if a specific date is a Japanese national holiday
Calculate the date N business days from a given date
Count the number of business days within a specified period

Tools advertised by the last live check:

is_holiday
list_holidays
add_business_days
business_days_between

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers a Streamable HTTP server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

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

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add plugrail-japanese-calendar-mcp --url https://jp-calendar.plugrail.dev/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable plugrail-japanese-calendar-mcp in your MCP settings.

Cursor configuration

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

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure). The type must be streamableHttp for a remote HTTP server.

Cline configuration

{
  "mcpServers": {
    "plugrail-japanese-calendar-mcp": {
      "type": "streamableHttp",
      "url": "https://jp-calendar.plugrail.dev/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start plugrail-japanese-calendar-mcp and inspect its tools.

VS Code configuration

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

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

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

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.

Claude Desktop configuration

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

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

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

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