How to Use the Lob MCP in Google ADK

Q: How do I install the Lob tools inside Google ADK?

Run pip install google-adk and define an McpToolset pointing to the Vinkius MCP Server HTTP endpoint. Pass this toolset directly into your LlmAgent initialization.

Q: Can I limit which Lob tools my Google ADK agent can access?

Yes. Use the toolnames filter parameter in your toolset configuration to restrict exposure to specific tools like verifyusaddress.

Q: What options do I have for sending letters?

Use createletter to send custom documents. It supports certified mail delivery and custom inserts for formal business correspondence.

Connect Gemini to physical mailboxes using Lob and the Google ADK.

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Create your Vinkius account to connect Lob to Google ADK 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 Google ADK

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Trigger physical mail directly from Google ADK

The `create_letter` tool handles certified mail and custom inserts for high-stakes business communication. Your enterprise agent can pull customer data from BigQuery and immediately generate physical letters. For visual outreach, `create_postcard` lets you send postcards with custom HTML or PDF fronts and backs. This lets your Gemini agent coordinate offline marketing campaigns using this MCP Server.

Clean mailing lists using the Lob MCP Server

The `verify_us_address` tool validates domestic destinations to ensure high deliverability rates. If your customers are global, `verify_intl_address` corrects international formats on the fly. Your agent can also run `autocomplete_address` to fix bad inputs before they hit your printing queue. This step cuts down on returned mail and wasted postage costs.

Send checks and track delivery status

The `create_check` tool allows your agent to write and mail physical checks programmatically. This is useful for automated accounts payable pipelines running on Google Cloud. Keep tabs on every envelope using `get_mail_tracking` to pull live delivery updates. You can also audit past operations with `list_letters` and `list_postcards` to prevent double-mailing.

Setup guide

Set up Lob MCP in Google ADK

Prerequisites

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

1

Install Google ADK

Run pip install google-adk to install the Agent Development Kit. MCP support is included via the McpToolset class.
2

Connect via SSE transport

Use McpToolset.from_server() with SseServerParams pointing to your Vinkius endpoint. Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com.
3

Create an LlmAgent

Pass the returned mcp_tools list directly to LlmAgent(tools=mcp_tools). The ADK maps each MCP tool to a native Gemini function call — no manual schema definitions required.
4

Run with any Gemini model

The agent works with any Gemini model (gemini-2.0-flash, gemini-2.5-pro, etc.). Copy the full example on the right to get started with Lob tools in your ADK agent.

agent.py

from google.adk.agents import LlmAgent
from google.adk.tools.mcp_tool.mcp_toolset import McpToolset
from google.adk.tools.mcp_tool.mcp_session_manager import SseServerParams

# Connect to the MCP via SSE
mcp_tools, exit_stack = await McpToolset.from_server(
    connection_params=SseServerParams(
        url="https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    )
)

# Create your agent with auto-discovered tools
agent = LlmAgent(
    name="Lob_agent",
    model="gemini-2.0-flash",
    instruction="You have access to Lob tools via MCP.",
    tools=mcp_tools,
)

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Common questions about Lob MCP in Google ADK

Run `pip install google-adk` and define an `McpToolset` pointing to the Vinkius MCP Server HTTP endpoint. Pass this toolset directly into your `LlmAgent` initialization.

Yes. Use the `tool_names` filter parameter in your toolset configuration to restrict exposure to specific tools like `verify_us_address`.

Gemini's long-context window allows your agent to process massive lists of customer records from BigQuery, mapping them to `create_postcard` calls in batches.

Use `create_letter` to send custom documents. It supports certified mail delivery and custom inserts for formal business correspondence.

This MCP Server runs the integration inside an ephemeral sandbox. All transmission occurs over secure TLS, meaning check details and physical addresses are purged instantly from the execution environment.

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