How to Use the Lob MCP in OpenAI Agents SDK

Q: How do I hook up Lob to my OpenAI Agents SDK pipeline?

Install openai-agents and configure the MCP HTTP server streamable parameters. Pass the server instance inside the mcpservers list when initializing your agent.

Q: Can my agent verify addresses before calling Lob with OpenAI Agents SDK?

Yes. Have your agent call verifyusaddress first to check formatting. This saves money by stopping undeliverable mail before printing.

Q: How does OpenAI Agents SDK manage tool caching for Lob?

Set cacheToolsList=True in your connection parameters. This keeps agent startup fast by caching the Lob tool schema definitions.

Q: Can I send custom HTML postcards using this server?

Yes. The createpostcard tool accepts raw HTML or PDF URLs for both front and back designs.

Send real mail, letters, and checks directly from your OpenAI Agents SDK workflows.

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Connect Lob MCP to OpenAI Agents SDK

Create your Vinkius account to connect Lob to OpenAI Agents 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 OpenAI Agents SDK

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Run direct mail campaigns with OpenAI Agents SDK

The `create_postcard` tool lets your agent send physical postcards using custom HTML or PDF layouts for both sides. Your Python agent triggers these mailings based on customer events, turning digital triggers into real-world mail without manual steps. To handle letters, the server provides `create_letter` which supports certified mail and custom inserts. Your agent can run these operations inside an MCP Server environment, giving you a physical footprint without any manual oversight.

Verify delivery addresses before printing

The `verify_us_address` tool checks domestic addresses to ensure they are deliverable before you spend money on postage. For global users, `verify_intl_address` handles international formats and corrects typos automatically. Your agent can also use `autocomplete_address` to suggest completions in real-time. This prevents formatting errors and keeps your database clean without requiring manual human cleanup.

Track shipments and issue checks via MCP Server

The `get_mail_tracking` tool pulls tracking logs so your agent can monitor delivery status. If you need to send payments, `create_check` lets your agent mail physical checks directly to vendors or customers. You can also query past mailings using `list_letters` and `list_postcards`. This lets the agent verify what has already been sent before triggering duplicate runs.

Setup guide

Set up Lob MCP in OpenAI Agents SDK

Prerequisites

Python 3.10+ installed
openai-agents package (pip install openai-agents)
Active Vinkius subscription with a valid endpoint token

1

Install the SDK

Run pip install openai-agents to install the OpenAI Agents SDK. The MCP integration is built-in — no extra dependencies needed.
2

Connect via SSE transport

Use MCPServerSse with your Vinkius endpoint URL. Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com. The SDK auto-discovers all Lob tools at runtime.
3

Create your Agent

Pass the MCP to Agent(mcp_servers=[server]). The agent receives Lob tools as native definitions — JSON schemas resolve automatically.
4

Run the agent

Call Runner.run(agent, prompt) to execute. The agent invokes the appropriate Lob tools and returns structured results. Copy the full example on the right to get started.

agent.py

import asyncio
from agents import Agent, Runner
from agents.mcp import MCPServerSse

async def main():
    async with MCPServerSse(
        url="https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    ) as server:
        agent = Agent(
            name="Lob Agent",
            instructions="You have access to Lob tools.",
            mcp_servers=[server],
        )
        result = await Runner.run(agent, "List recent transactions")
        print(result.final_output)

asyncio.run(main())

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Common questions about Lob MCP in OpenAI Agents SDK

Install `openai-agents` and configure the MCP HTTP server streamable parameters. Pass the server instance inside the `mcp_servers` list when initializing your agent.

Yes. Have your agent call `verify_us_address` first to check formatting. This saves money by stopping undeliverable mail before printing.

Set `cacheToolsList=True` in your connection parameters. This keeps agent startup fast by caching the Lob tool schema definitions.

Yes. The `create_postcard` tool accepts raw HTML or PDF URLs for both front and back designs.

This MCP Server processes all address verification and mailing requests inside an ephemeral, zero-trust V8 isolate. Your physical addresses, tracking details, and check information never persist on our network after the API call completes.

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