Holiday Calendar MCP Server: Install & Setup

Install Holiday Calendar in Claude Code

Claude Code

claude mcp add --transport http holiday-calendar https://starter.modernmustardseed.com/holidays

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

{
  "mcpServers": {
    "holiday-calendar": {
      "url": "https://starter.modernmustardseed.com/holidays"
    }
  }
}

U.S. federal holidays with observed dates and business-day math. Example from an open-source kit.

Yes, most likely. Open source and no paid account or API key is mentioned in the listing. Check the provider for current pricing.

Remote. Hosted by the provider. You connect with a URL, nothing to install.

Run: claude mcp add --transport http holiday-calendar https://starter.modernmustardseed.com/holidays

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