How to Use the Nager.Date MCP in Vercel AI SDK

Q: Does this integration support international country codes?

Yes. The server maps ISO codes using listavailablecountries to ensure your AI client always sends valid inputs to the calendar tools.

Stream global public holiday data directly into your React or Next.js UI using the Vercel AI SDK.

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Connect Nager.Date MCP to Vercel AI SDK

Create your Vinkius account to connect Nager.Date to Vercel AI SDK and route execution through our secure gateway. The platform manages server hosting, runtime updates, and security layers. Configuration requires no manual server provisioning.

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Setup Nager.Date with Vercel AI SDK

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Real-time holiday calendar rendering

Your AI client uses `get_public_holidays` to fetch calendar dates and stream them directly to your frontend. This prevents long loading states because the Vercel AI SDK processes each holiday date the moment the backend API returns it. By feeding `list_available_countries` into your stream, your interface generates country selection dropdowns on the fly. Users don't wait for a full payload to load before they can interact with the global schedule.

Dynamic checkout adjustments

Your AI client runs `is_holiday_today` inside Edge Functions to check if shipping carriers are closed right now. The Vercel AI SDK streams immediate delivery date adjustments directly to your customer's shopping cart UI. This setup uses `get_country_details` to verify regional shipping rules based on the user's location. You avoid shipping delays by letting the agent recalculate dates before the checkout button is even clicked.

Global shipping alerts with this MCP Server

Your AI client calls `get_next_holidays_worldwide` to spot upcoming shipping bottlenecks across different continents. The Vercel AI SDK pushes these critical calendar dates to your operations dashboard in a live text stream. Using `get_next_holidays` allows the agent to isolate regional backlogs before they trigger customer service complaints. This MCP integration provides real-time operational updates without writing complex cron jobs or polling mechanisms.

Setup guide

Set up Nager.Date MCP in Vercel AI SDK

Prerequisites

Node.js 18+ and a TypeScript project
ai + @modelcontextprotocol/sdk packages
Active Vinkius subscription with a valid endpoint token

1

Install dependencies

Run npm install ai @modelcontextprotocol/sdk plus your preferred model provider (e.g. @ai-sdk/openai).
2

Create the Streamable HTTP transport

Use StreamableHTTPClientTransport with your Vinkius endpoint URL. Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com.
3

Discover and use tools

Call mcpClient.tools() to auto-discover all Nager.Date tools. Pass them directly to generateText() or streamText() — no manual schema definitions needed.
4

Works with any model provider

Swap openai("gpt-4o") for any AI SDK provider — Anthropic, Google, Mistral. The MCP tools work identically across all supported models.

index.ts

import { experimental_createMCPClient as createMCPClient } from "ai";
import { StreamableHTTPClientTransport } from "@modelcontextprotocol/sdk/client/streamableHttp";
import { generateText } from "ai";
import { openai } from "@ai-sdk/openai";

const transport = new StreamableHTTPClientTransport(
  new URL("https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp")
);

const mcpClient = await createMCPClient({ transport });
const tools = await mcpClient.tools();

const { text } = await generateText({
  model: openai("gpt-4o"),
  tools,
  prompt: "List recent Nager.Date transactions",
});

console.log(text);
await mcpClient.close();

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Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by Nager.Date. All third-party trademarks, logos, and brand names are the property of their respective owners. Their use on this website is strictly for informational purposes to identify service compatibility and interoperability.

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Common questions about Nager.Date MCP in Vercel AI SDK

You register this MCP server with the SDK's tool calling system and pass the tools directly into streamText. Your frontend receives holiday dates from `get_public_holidays` as they arrive, allowing you to render custom UI components instantly.

Yes. This server runs in a lightweight MCP sandbox that is fully compatible with Vercel's edge environment. You can check `is_holiday_today` on the edge to block or redirect traffic based on regional closures.

The SDK relies on your application's middleware or API route configuration to throttle requests. Because tools like `get_next_holidays_worldwide` can hit external endpoints, you should wrap your call in a caching layer if your UI triggers frequent streams.

Yes. The server maps ISO codes using `list_available_countries` to ensure your AI client always sends valid inputs to the calendar tools.

This server only processes public holiday metadata, country codes, and dates. No personal customer information or shipping addresses are ever sent to the Nager.Date API, keeping your transactional data private.

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