How to Use the Lob MCP in Mastra AI

Q: Is address verification required before using Lob in Mastra AI?

It is best practice. You should always run verifyusaddress as a prerequisite step in your workflow to prevent invalid mailings.

Q: Does Mastra AI support human approval for Lob mailings?

Yes, you can enable requireToolApproval for any tool, including createcheck, to ensure a human reviews the mail before it goes out.

Build reliable physical mail workflows in Mastra AI. Automate checks, letters, and postcards with built-in retry logic.

See Vinkius in Action

Works with every AI agent you already use

…and any MCP-compatible client

MCP Servers - Free for Subscribers

Connect Lob MCP to Mastra AI

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

GDPR Free for Subscribers

Setup Lob with Mastra AI

Ask AI about this MCP

ChatGPT

Claude

Perplexity

Conditional mail automation

Use Mastra AI workflows to decide when to send mail. If a transaction requires a paper trail, trigger `create_check` or `create_letter` automatically. Set up branch logic to handle address verification failures using `verify_us_address` before the workflow attempts to print a document.

Resilient document pipelines

Mastra AI handles the execution of `create_postcard` with built-in retries. If the API hits a rate limit, the workflow waits and tries again. This ensures your physical communication stays consistent even when external services face temporary network hiccups.

Multi-step fulfillment tracking

Chain your mail tasks with `get_mail_tracking` to keep the audit trail intact. Your agents can verify delivery and update internal states based on the results. This makes it easy to track whether a physical check reached the intended recipient without manual oversight.

Setup guide

Set up Lob MCP in Mastra AI

Prerequisites

Node.js 18+ and a TypeScript project
@mastra/mcp + @mastra/core packages
Active Vinkius subscription with a valid endpoint token

1

Install dependencies
Run npm install @mastra/mcp @mastra/core plus your preferred model provider (e.g. @ai-sdk/openai).
2

Configure the MCPClient
Create an MCPClient with your Vinkius endpoint as a URL object. Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com.
3

Discover and inject tools
Call mcpClient.listTools() and spread the result into your agent's tools object. All Lob tools become native Mastra tools.
4

Run with any model
Swap openai("gpt-4o") for any AI SDK-compatible provider. Call agent.generate() and the agent routes tool calls through MCP automatically.

agent.ts

import { MCPClient } from "@mastra/mcp";
import { Agent } from "@mastra/core/agent";
import { openai } from "@ai-sdk/openai";

const mcpClient = new MCPClient({
  id: "lob-alternative-mcp-client",
  servers: {
    "lob-alternative-mcp": {
      url: new URL(
        "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
      ),
    },
  },
});

const agent = new Agent({
  name: "Lob Agent",
  model: openai("gpt-4o"),
  instructions: "You have access to Lob tools.",
  tools: {
    ...(await mcpClient.listTools()),
  },
});

const result = await agent.generate(
  "List recent Lob transactions"
);
console.log(result.text);

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

Vinkius connects your tools to AI with real-time monitoring and automatic cost savings — all from one dashboard.

Connect Lob now

Real-time monitoring

Live

visibility into every interaction

Connect your favorite tools to your AI and see exactly what's happening — every request, every response, in real time.

Built-in savings

60%

lower AI costs

Vinkius compresses data between your apps and your AI automatically. Lower bills every month — no configuration required.

Single dashboard

One

place for every integration

Every tool your AI connects to, managed from a single screen. One account, complete control.

Common questions about Lob MCP in Mastra AI

Install the MCP client package and initialize it within your Mastra agent configuration. You then spread the Lob tools into your agent's tool list for immediate use.

Yes. You configure the retry logic within your workflow engine, which then calls the Lob tools until the operation succeeds or hits your defined limit.

It is best practice. You should always run `verify_us_address` as a prerequisite step in your workflow to prevent invalid mailings.

Yes, you can enable `requireToolApproval` for any tool, including `create_check`, to ensure a human reviews the mail before it goes out.

The server processes address and recipient data through encrypted channels. Your workflow only touches the specific data required for the `create_letter` or `verify_us_address` tools, keeping your PII footprint minimal.

Use it with your favorite AI tools

Connect this server to Cursor, Claude, VS Code, and more.

OpenAI Agents SDK sdk-python

Google ADK sdk-python

Pydantic AI sdk-python

Vercel AI SDK sdk-typescript