How to Use the Lob MCP in Vercel AI SDK

Q: Can my Vercel AI SDK app handle failed mail deliveries?

Yes. You can use the getmailtracking tool to fetch status updates and trigger alerts in your UI if a delivery fails or gets returned.

Trigger physical mail from your Vercel AI SDK app. Send checks, letters, and postcards directly from your server-side logic.

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Connect Lob MCP to Vercel AI SDK

Create your Vinkius account to connect Lob 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 Lob with Vercel AI SDK

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Real-time address validation

Your AI client needs clean data before printing. Use `verify_us_address` or `verify_intl_address` to catch errors before you waste money on postage. Integrate these tools into your streamText flow so your UI updates instantly as the agent checks the incoming address data.

Automated document dispatch

Trigger `create_letter` or `create_postcard` directly from your edge functions. Your Vercel AI SDK app handles the heavy lifting of document generation without complex middleware. Pass your HTML or PDF templates through the tools and watch the status update in your dashboard without refreshing the page.

Live delivery tracking

Monitor every piece of mail using `get_mail_tracking` inside your application state. You get the exact status of your letters and checks in your React or Next.js interface. Keep your users updated on their physical mail status by polling the Lob API through your standard AI client tool-calling patterns.

Setup guide

Set up Lob 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 Lob 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 Lob 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 Lob. 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 Lob MCP in Vercel AI SDK

You connect the MCP server via the @ai-sdk/mcp package. Once you initialize the client, pass the Lob tools into your generateText or streamText calls to start sending mail.

Yes. You can use the `get_mail_tracking` tool to fetch status updates and trigger alerts in your UI if a delivery fails or gets returned.

Absolutely. Since the MCP server communicates over HTTP, it runs perfectly within your edge-compatible TypeScript code.

No. You retrieve tracking data directly from the API using the provided tools, keeping your application database clean.

The server transmits address data directly to the secure API endpoint. Your agent only handles the necessary fields for `verify_us_address` or document creation, ensuring sensitive information doesn't linger in your logs.

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