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U.S. federal holidays with observed dates and business-day math. Example from an open-source kit.
npx @getmcp/cli add com.modernmustardseed/holiday-calendarRequires Node.js 18+. Community-contributed server. Review source before installing.
Config file: ~/Library/Application Support/Claude/claude_desktop_config.json
{
"mcpServers": {
"com.modernmustardseed/holiday-calendar": {
"url": "https://starter.modernmustardseed.com/holidays",
"transport": "streamable-http"
}
}
}