Holidays MCP for ChatGPT

io.github.lulu-the-narwhal/holidays-mcp

Free, keyless public holidays lookup for any country and year, plus single-date holiday checks.

client:ChatGPT transport:streamable-http tools:2

Install Holidays MCP in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://ads.getlulu.dev/holidays/mcp

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