How to Use the Lob MCP in Mastra AI

Q: Can I use Lob for automated check printing in Mastra AI?

Absolutely. You set up your bank account via createbankaccount and then use createcheck inside your agent workflow to disburse funds securely.

Q: Is Lob address verification reliable in Mastra AI?

You use verifyusaddress as a gatekeeper in your process. If the address is invalid, the agent can stop the workflow or flag it for human review.

Q: Does the server support batch mailing?

You can loop through your contact list using listaddresses and trigger mailings in sequence. The agent manages the iteration and error handling for each item.

Automate complex physical mail workflows in Mastra AI with built-in retry logic.

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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.

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Setup Lob with Mastra AI

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Perplexity

Handle mailing failures in Mastra AI

Your agents can now perform multi-step mailing tasks with confidence. Use `create_check` to initiate payments, while the framework manages the state and retries if the network hits a snag. This prevents the manual cleanup work that usually happens when an API call drops. You define the workflow, and the server handles the execution.

Automate address books with Mastra AI

Keep your contact list synced without human intervention. The `create_address` and `delete_address` tools allow your agents to manage your mailing database based on incoming events. If a record goes stale, the agent simply updates it. It keeps your database accurate for every automated run.

Conditional mailers for Mastra AI agents

Build logic that chooses the right document type based on user behavior. Use `create_postcard` or `create_letter` depending on the specific criteria your agent identifies. This gives your agent the ability to decide how to communicate physically. It's all about choosing the right format for the message.

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-mcp-client",
  servers: {
    "lob-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);

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Common questions about Lob MCP in Mastra AI

You add the MCP server to your Mastra agent configuration. This exposes the full suite of mail tools, allowing the agent to trigger physical mail as a step in any flow.

Absolutely. You set up your bank account via `create_bank_account` and then use `create_check` inside your agent workflow to disburse funds securely.

You use `verify_us_address` as a gatekeeper in your process. If the address is invalid, the agent can stop the workflow or flag it for human review.

You can loop through your contact list using `list_addresses` and trigger mailings in sequence. The agent manages the iteration and error handling for each item.

This server uses your unique endpoint token to ensure that your PII, like mailing addresses, is isolated. Only your authenticated agents can interact with your Lob account.

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