How to Use the Lob MCP in Vercel AI SDK

Q: How do I use Lob with Vercel AI SDK for verification?

You connect the MCP server to your project and call the verifyusaddress tool. The result returns a standardized address object you can immediately update in your React state.

Q: Can Vercel AI SDK handle Lob status updates?

Yes, you poll the listletters tool within your effect hooks. This gives you the tracking ID and arrival date to display in your UI.

Q: Does this MCP server support custom templates?

It does. You use createtemplate to store your HTML and then reference it when calling createletter to generate your mailers.

Q: What happens if a mailing fails?

You check the status field returned by getletter. If the request was aborted, you can use cancelletter to stop it if it's still in the processing queue.

Build real-time physical mail automation directly into your Vercel AI SDK frontends.

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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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Stream address validation with Vercel AI SDK

Your UI components can now verify shipping destinations instantly. Use `verify_us_address` to clean up user input before the request ever hits your backend. This keeps your data entry clean and prevents returned mail. It's built for reactive flows where the user sees the correction happen as they type.

Trigger letters via Vercel AI SDK agents

You can now fire off physical correspondence from your event handlers. The `create_letter` tool maps your template variables to a finished document ready for the printer. Connecting this to your stream allows users to see the confirmation status immediately. It turns a standard form submission into a live, observable process.

Track physical mail inside Vercel AI SDK

Don't leave your users guessing about their mail status. Use `list_letters` to pull tracking numbers and delivery estimates directly into your dashboard. Everything happens over the connection you've already established. It's the simplest way to keep your users updated on their physical document history.

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();

Get your connection token →

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.

Why Choose Vinkius

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Common questions about Lob MCP in Vercel AI SDK

You connect the MCP server to your project and call the `verify_us_address` tool. The result returns a standardized address object you can immediately update in your React state.

Yes, you poll the `list_letters` tool within your effect hooks. This gives you the tracking ID and arrival date to display in your UI.

Your endpoint token manages access to your Lob data. The Vercel AI SDK acts as a secure pipe, ensuring that your address and mailing info stay protected during transmission.

It does. You use `create_template` to store your HTML and then reference it when calling `create_letter` to generate your mailers.

You check the status field returned by `get_letter`. If the request was aborted, you can use `cancel_letter` to stop it if it's still in the processing queue.

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