How to Use the Lob MCP in Cursor

Q: How do I configure the Lob MCP Server in Cursor?

Create a .cursor/mcp.json file in your project root and add the server setup. Once saved, Cursor Agent mode can immediately access all address and mailing tools.

Q: Can Cursor write tests for sending Lob letters?

Yes, Cursor can run listletters to fetch actual delivery records and write precise unit tests. This ensures your app handles real-world mail responses without relying on outdated documentation.

Q: How do I verify US addresses inside Cursor using Lob?

Ask the Cursor agent to run verifyusaddress with your target address block. The agent will execute the tool and print the standardized USPS format directly in your terminal chat.

Q: Can I preview my postcard designs inside the editor?

While Cursor cannot render physical paper, it uses createpostcard to generate a test mailpiece. You can then pull the preview URL from the API response to check your HTML layout.

Generate code in Cursor that triggers physical mail, prints checks, and tracks shipments using live Lob API tools.

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Connect Lob MCP to Cursor

Create your Vinkius account to connect Lob to Cursor 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 Cursor

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Build mail-sending code in Cursor Agent mode

Cursor uses this MCP Server to write and debug code that interacts with the physical world. Instead of writing mock tests, your Cursor agent calls `create_postcard` or `create_letter` to test live API payloads right inside your editor. The agent reads the exact API responses to build your database schemas and mailer logic. You get working code that handles physical mail workflows without guessing the JSON structure.

Validate postal addresses during active development

Stop writing complex regex to check mailing addresses in your code. Let your Cursor agent run `verify_us_address` and `verify_intl_address` directly against the live Lob registry while you write your validation logic. If you need to build lookup forms, the agent uses `autocomplete_address` to test completion speeds and payload shapes. This keeps your development loop fast and your address database clean.

Automate financial payouts and mail tracking

Write secure billing scripts with this MCP Server that issue physical checks. Your Cursor editor triggers `create_check` to run live tests, ensuring your accounting integration works perfectly before you commit code. You can also build tracking dashboards in minutes. The agent invokes `get_mail_tracking` to pull live shipping states, helping you map delivery events to your internal application database.

Setup guide

Set up Lob MCP in Cursor

Prerequisites

Cursor installed (macOS, Windows, or Linux)
Active Vinkius subscription with a valid endpoint token

1

Open MCP Settings

Go to Cursor Settings → MCP or open the Command Palette (Cmd+Shift+P / Ctrl+Shift+P) and search for "MCP: Add Server".
2

Add the Lob MCP

Cursor will create or open .cursor/mcp.json in your project root. Paste the JSON snippet on the right. Replace [YOUR_TOKEN_HERE] with your endpoint token from cloud.vinkius.com.
3

Enable Agent mode

Open Composer (Cmd+I / Ctrl+I) and switch to Agent mode using the dropdown at the top. MCP tools are only available in Agent mode.
4

Verify the connection

Ask Cursor something like "List my recent Lob transactions." If the MCP tools are loaded correctly, Cursor will call the Lob tools automatically. You can also check Settings → MCP for a green status indicator.

.cursor/mcp.json

{
  "mcpServers": {
    "lob-alternative-mcp": {
      "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    }
  }
}

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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 Cursor

Create a `.cursor/mcp.json` file in your project root and add the server setup. Once saved, Cursor Agent mode can immediately access all address and mailing tools.

Yes, Cursor can run `list_letters` to fetch actual delivery records and write precise unit tests. This ensures your app handles real-world mail responses without relying on outdated documentation.

Ask the Cursor agent to run `verify_us_address` with your target address block. The agent will execute the tool and print the standardized USPS format directly in your terminal chat.

While Cursor cannot render physical paper, it uses `create_postcard` to generate a test mailpiece. You can then pull the preview URL from the API response to check your HTML layout.

Cursor executes these tools through a local configuration that keeps your API keys secure. Your customer names, physical addresses, and banking details are processed in memory and never stored on Cursor's indexing servers.

Use it with your favorite AI tools

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

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