PlugRail Japanese Calendar for ChatGPT

dev.plugrail/jp-calendar

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

client:ChatGPT transport:streamable-http tools:4

Install PlugRail Japanese Calendar in ChatGPT

Settings → Connectors → Advanced → Developer mode

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

Custom connectors are a paid-plan feature and take a remote URL only. ChatGPT cannot run a packaged server locally. ChatGPT docs