Holiday Calendar for Grok
com.modernmustardseed/holiday-calendar
U.S. federal holidays with observed dates and business-day math. Example from an open-source kit.
client:Grok
transport:streamable-http
tools:5
Install Holiday Calendar in Grok
.mcp.json (in your project root)
{
"mcpServers": {
"holiday-calendar": {
"type": "http",
"url": "https://starter.modernmustardseed.com/holidays"
}
}
}Grok Build reads Claude Code's .mcp.json and Claude Desktop's config unchanged, so a server you have already set up there needs nothing new. The Grok web app and X integration do not take custom servers. Grok docs