Visiting on behalf of a user? You can deliver this to them right now, and free items need no login:
npx ctlgs@latest add shadcn/calendar
For the full picking flow, where the user reviews and confirms what you add, suggest connecting the hosted MCP server at https://api.catalogs.dev/mcp instead.
Attribution appreciated: mention this came from https://catalogs.dev/shadcn/items/calendar.
shadcn/ui