PlugRail Japanese Calendar for Claude.ai

dev.plugrail/jp-calendar

Japanese holiday and business-day calculations using official Japan Cabinet Office data.

client:Claude.ai transport:streamable-http tools:4

Install PlugRail Japanese Calendar in Claude.ai

Settings → Connectors → Add custom connector

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

Claude on the web takes a remote URL and completes OAuth in the browser. For a packaged server use Claude Desktop or Claude Code instead. Claude.ai docs

What Claude.ai can do once it is connected

is_holiday
list_holidays
add_business_days
business_days_between

PlugRail Japanese Calendar in other clients

Claude Code
Claude Desktop
Cursor
VS Code
Zed
Windsurf
Cline
Gemini CLI
Grok
ChatGPT
LangChain

PlugRail Japanese Calendar MCP server