Japanese holiday and business-day calculations using official Japan Cabinet Office data.
Quick Install
Automated & IDE SetupCopy the AI prompt to install this server into Claude Code, Cursor, or another agent — or use 1-click editor setup below.
Manual Client & Custom JSON ConfigExpand JSON ▾
Client Config & Setup
Remote HTTPChoose your client or environment
Target File:
💡 Paste the JSON block into your client's configuration file under mcpServers, then restart the application.
Documentation Overview
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
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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Frequently Asked Questions about PlugRail Japanese Calendar
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CategoryDeveloper Tools
11/11 checks healthy over the last 39d
37Quality signal: Fair · 37/100How this signal is calculated ▾
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Not scored for repo-hosted servers — we can't reach the running server, only its GitHub page. Hosted MCP endpoints are health-checked live.
Verified ownership10/20
Documentation & tools16/30
Adoption & activity2/15
Community engagement0/10
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