plugrail

Bring Japan's public data within reach of AI agents.

plugrail is a collection of MCP servers that connect AI agents to Japanese public data. Start with Japanese holiday and business-day calculations through jp-calendar.

Connect for free View on GitHub

plugrail is not affiliated with Railway or Ruby on Rails.

Connect to jp-calendar

Server URL: https://jp-calendar.plugrail.dev/mcp
Transport: Streamable HTTP
Authentication: None required; anonymous access is available

Claude Code — 3 steps

Open your terminal.
Run:

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

Ask Claude Code: “What is the next business day in Japan?”

Claude (Web / Desktop) — 3 steps

Open Customize (or Settings) → Connectors.
Select + → Add custom connector.
Enter https://jp-calendar.plugrail.dev/mcp, select Add, and ask: “What is the next business day in Japan?”