Name: PlugRail Japanese Calendar
Author: plugrail

What can you do with PlugRail Japanese Calendar?

plugrail

A collection of MCP servers that connect to Japanese public data. The name alone does not describe the project, so plugrail is not related to railways or railway services.

Live servers

Server	MCP endpoint	Tools	Status
jp-calendar	`https://jp-calendar.plugrail.dev/mcp`	`is_holiday`, `list_holidays`, `business_days_between`, `add_business_days`	Live

Connect

See the jp-calendar connection guide.

Self-hosting

In packages/servers/jp-calendar/, copy wrangler.example.jsonc to wrangler.jsonc and fill in your Cloudflare resource IDs.
Create the D1 database and KV namespace referenced by that configuration.
Run pnpm --filter @plugrail/jp-calendar deploy.

The self-hosted server runs independently. Authentication, rate limiting, and usage metering are features of the hosted service only.

Architecture

MCP client
    |
    v
jp-calendar Worker --> Cloudflare D1 (holiday data)
                   --> Cloudflare KV (cached data)

Sources and disclaimer

This is not an official service of the National Tax Agency, the Digital Agency, or any other Japanese government body. Information provided does not represent their official views and is not guaranteed by them.

Source: Adapted from the Cabinet Office "National Holidays" page (https://www8.cao.go.jp/chosei/shukujitsu/gaiyou.html)

Contributing

Issues and pull requests are welcome. Please include enough context to reproduce a problem or explain a proposed change.

License

MIT. See LICENSE.

Install

Add PlugRail Japanese Calendar to your client. Pick the one you use.

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

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

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

Add to `~/.cursor/mcp.json`, or `.cursor/mcp.json` for a single project.

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

Add to `.vscode/mcp.json` in your workspace.

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

Add to `claude_desktop_config.json`, then restart Claude Desktop.

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

Add to `~/.codeium/windsurf/mcp_config.json`.

Score

39 / 100

Incomplete

Documentation22/25
Maintenance16/25
Trust16/20
Capability0/15
Install experience12/15

Documents what it does and how to connect
Has a resolvable package or endpoint
Exposes at least one tool, prompt or resource
README has substantive content
Includes a code example
Documents its configuration
Mentions credentials or security posture
Last commit 52 days ago
Has a release history
Repository is not archived
Licensed MIT
Namespace verified in the official MCP registry
Claimed by its owner
Published under an organisation
0 tool(s) documented
Provides prompt templates
Provides resources
6 documented install method(s)
Published to a package registry
Offers a hosted endpoint — no local install

Read the full rubric →

Version history

Versions	Published
0.1.1Latest	Jul 11, 2026
0.1.0	Jul 11, 2026