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Japanese holiday and business-day calculations using official Japan Cabinet Office data.
About
Japanese holiday and business-day calculations using official Japan Cabinet Office data.
Remote endpoints: streamable-http: https://jp-calendar.plugrail.dev/mcp
Security Report
10.0
Low Risk10.0Low RiskValid MCP server (2 strong, 1 medium validity signals). No known CVEs in dependencies. Imported from the Official MCP Registry.
4 tools verified · Open access · No issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Permissions Required
This plugin requests these system permissions. Most are normal for its category.
How to Connect
Remote Plugin
No local installation needed. Your AI client connects to the remote endpoint directly.
Add this to your MCP configuration to connect:
{
"mcpServers": {
"dev-plugrail-jp-calendar": {
"url": "https://jp-calendar.plugrail.dev/mcp"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
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/, copywrangler.example.jsonctowrangler.jsoncand 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.
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