How to integrate Smartlead MCP with Google ADK

This guide walks you through connecting Smartlead to Google ADK using the Composio tool router. By the end, you'll have a working Smartlead agent that can list your campaigns, create draft campaigns, check delivery tests, and review email accounts through natural language commands. This guide will help you understand how to give your Google ADK agent real control over a Smartlead account through Composio's Smartlead MCP server. Before we dive in, let's take a quick look at the key ideas and tools involved.

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Smartlead is a sales engagement platform for cold email campaigns, leads, sending accounts, inbox activity, deliverability, prospecting, and sender provisioning. Use it to run outbound sales at scale while keeping campaign operations, replies, and sender health in one place.

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Introduction

This guide walks you through connecting Smartlead to Google ADK using the Composio tool router. By the end, you'll have a working Smartlead agent that can list your campaigns, create draft campaigns, check delivery tests, and review email accounts through natural language commands.

This guide will help you understand how to give your Google ADK agent real control over a Smartlead account through Composio's Smartlead MCP server.

Before we dive in, let's take a quick look at the key ideas and tools involved.

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TL;DR

Here's what you'll learn:
  • Get a Smartlead account set up and connected to Composio
  • Install the Google ADK and Composio packages
  • Create a Composio Tool Router session for Smartlead
  • Build an agent that connects to Smartlead through MCP
  • Interact with Smartlead using natural language

What is Google ADK?

Google ADK (Agents Development Kit) is Google's framework for building AI agents powered by Gemini models. It provides tools for creating agents that can use external services through the Model Context Protocol.

Key features include:

  • Gemini Integration: Native support for Google's Gemini models
  • MCP Toolset: Built-in support for Model Context Protocol tools
  • Streamable HTTP: Connect to external services through streamable HTTP
  • CLI and Web UI: Run agents via command line or web interface

What is the Smartlead MCP server, and what's possible with it?

The Smartlead MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Smartlead account. It provides structured and secure access to your campaigns, leads, inbox replies, sending accounts, deliverability tests, and prospecting tools, so your agent can manage campaigns, review performance, monitor replies, find prospects, and assess sender resources on your behalf.

  • Campaign creation and management: Have your agent create draft campaigns, review existing campaigns and their settings, or delete campaigns you no longer need.
  • Lead and performance monitoring: Let the agent list campaign leads, review email engagement statistics, remove unwanted leads, and resume paused leads.
  • Inbox and direct email actions: Instruct your agent to review lead replies across campaigns or send a single email from a connected Smartlead sending account.
  • Deliverability and account checks: Direct your agent to inspect sending account health, review spam and inbox placement tests, and organize tests with delivery folders.
  • Prospecting and sender research: Have your agent search prospect contacts, explore industries and saved searches, check prospect usage, compare sender vendors, and find available or purchased domains.

What is the Composio tool router, and how does it fit here?

What is Composio SDK?

Composio's Composio SDK helps agents find the right tools for a task at runtime. You can plug in multiple toolkits (like Gmail, HubSpot, and GitHub), and the agent will identify the relevant app and action to complete multi-step workflows. This can reduce token usage and improve the reliability of tool calls. Read more here: Getting started with Composio SDK

The tool router generates a secure MCP URL that your agents can access to perform actions.

How the Composio SDK works

The Composio SDK follows a three-phase workflow:

  1. Discovery: Searches for tools matching your task and returns relevant toolkits with their details.
  2. Authentication: Checks for active connections. If missing, creates an auth config and returns a connection URL via Auth Link.
  3. Execution: Executes the action using the authenticated connection.

Step-by-step Guide

Step by step09 STEPS
1

Prerequisites

Before starting, make sure you have:
  • A Google API key for Gemini models
  • A Composio account and API key
  • Python 3.9 or later installed
  • Basic familiarity with Python
2

Getting API Keys for Google and Composio

Google API Key
  • Go to Google AI Studio and create an API key.
  • Copy the key and keep it safe. You will put this in GOOGLE_API_KEY.
Composio API Key and User ID
  • Log in to the Composio dashboard.
  • Go to Settings → API Keys and copy your Composio API key. Use this for COMPOSIO_API_KEY.
  • Decide on a stable user identifier to scope sessions, often your email or a user ID. Use this for COMPOSIO_USER_ID.
3

Install dependencies

bash
pip install google-adk composio python-dotenv

Inside your virtual environment, install the required packages.

What's happening:

  • google-adk is Google's Agents Development Kit
  • composio connects your agent to Smartlead via MCP
  • python-dotenv loads environment variables
4

Set up ADK project

bash
adk create my_agent

Set up a new Google ADK project.

What's happening:

  • This creates an agent folder with a root agent file and .env file
5

Set environment variables

bash
GOOGLE_API_KEY=your-google-api-key
COMPOSIO_API_KEY=your-composio-api-key
COMPOSIO_USER_ID=your-user-id-or-email

Save all your credentials in the .env file.

What's happening:

  • GOOGLE_API_KEY authenticates with Google's Gemini models
  • COMPOSIO_API_KEY authenticates with Composio
  • COMPOSIO_USER_ID identifies the user for session management
6

Import modules and validate environment

python
import os
import warnings

from composio import Composio
from dotenv import load_dotenv
from google.adk.agents.llm_agent import Agent
from google.adk.tools.mcp_tool.mcp_session_manager import StreamableHTTPConnectionParams
from google.adk.tools.mcp_tool.mcp_toolset import McpToolset

load_dotenv()

warnings.filterwarnings("ignore", message=".*BaseAuthenticatedTool.*")

GOOGLE_API_KEY = os.getenv("GOOGLE_API_KEY")
COMPOSIO_API_KEY = os.getenv("COMPOSIO_API_KEY")
COMPOSIO_USER_ID = os.getenv("COMPOSIO_USER_ID")

if not GOOGLE_API_KEY:
    raise ValueError("GOOGLE_API_KEY is not set in the environment.")
if not COMPOSIO_API_KEY:
    raise ValueError("COMPOSIO_API_KEY is not set in the environment.")
if not COMPOSIO_USER_ID:
    raise ValueError("COMPOSIO_USER_ID is not set in the environment.")
What's happening:
  • os reads environment variables
  • Composio is the main Composio SDK client
  • GoogleProvider declares that you are using Google ADK as the agent runtime
  • Agent is the Google ADK LLM agent class
  • McpToolset lets the ADK agent call MCP tools over HTTP
7

Create Composio client and Tool Router session

python
composio_client = Composio(api_key=COMPOSIO_API_KEY)

composio_session = composio_client.create(
    user_id=COMPOSIO_USER_ID,
    toolkits=["smartlead"],
)

COMPOSIO_MCP_URL = composio_session.mcp.url,
print(f"Composio MCP URL: {COMPOSIO_MCP_URL}")
What's happening:
  • Authenticates to Composio with your API key
  • Declares Google ADK as the provider
  • Spins up a short-lived MCP endpoint for your user and selected toolkit
  • Stores the MCP HTTP URL for the ADK MCP integration
8

Set up the McpToolset and create the Agent

python
composio_toolset = McpToolset(
    connection_params=StreamableHTTPConnectionParams(
        url=COMPOSIO_MCP_URL,
        headers={"x-api-key": COMPOSIO_API_KEY}
    )
)

root_agent = Agent(
    model="gemini-2.5-flash",
    name="composio_agent",
    description="An agent that uses Composio tools to perform actions.",
    instruction=(
        "You are a helpful assistant connected to Composio. "
        "You have the following tools available: "
        "COMPOSIO_SEARCH_TOOLS, COMPOSIO_MULTI_EXECUTE_TOOL, "
        "COMPOSIO_MANAGE_CONNECTIONS, COMPOSIO_REMOTE_BASH_TOOL, COMPOSIO_REMOTE_WORKBENCH. "
        "Use these tools to help users with Smartlead operations."
    ),
    tools=[composio_toolset],
)

print("\nAgent setup complete. You can now run this agent directly ;)")
What's happening:
  • Connects the ADK agent to the Composio MCP endpoint through McpToolset
  • Uses Gemini as the model powering the agent
  • Lists exact tool names in instruction to reduce misnamed tool calls
9

Run the agent

bash
# Run in CLI mode
adk run my_agent

# Or run in web UI mode
adk web

Execute the agent from the project root. The web command opens a web portal where you can chat with the agent.

What's happening:

  • adk run runs the agent in CLI mode
  • adk web . opens a web UI for interactive testing

Complete Code

Here's the complete code to get you started with Smartlead and Google ADK:

python
import os
import warnings

from composio import Composio
from composio_google import GoogleProvider
from dotenv import load_dotenv
from google.adk.agents.llm_agent import Agent
from google.adk.tools.mcp_tool.mcp_session_manager import StreamableHTTPConnectionParams
from google.adk.tools.mcp_tool.mcp_toolset import McpToolset

load_dotenv()
warnings.filterwarnings("ignore", message=".*BaseAuthenticatedTool.*")

GOOGLE_API_KEY = os.getenv("GOOGLE_API_KEY")
COMPOSIO_API_KEY = os.getenv("COMPOSIO_API_KEY")
COMPOSIO_USER_ID = os.getenv("COMPOSIO_USER_ID")

if not GOOGLE_API_KEY:
    raise ValueError("GOOGLE_API_KEY is not set in the environment.")
if not COMPOSIO_API_KEY:
    raise ValueError("COMPOSIO_API_KEY is not set in the environment.")
if not COMPOSIO_USER_ID:
    raise ValueError("COMPOSIO_USER_ID is not set in the environment.")

composio_client = Composio(api_key=COMPOSIO_API_KEY, provider=GoogleProvider())

composio_session = composio_client.create(
    user_id=COMPOSIO_USER_ID,
    toolkits=["smartlead"],
)

COMPOSIO_MCP_URL = composio_session.mcp.url


composio_toolset = McpToolset(
    connection_params=StreamableHTTPConnectionParams(
        url=COMPOSIO_MCP_URL,
        headers={"x-api-key": COMPOSIO_API_KEY}
    )
)

root_agent = Agent(
    model="gemini-2.5-flash",
    name="composio_agent",
    description="An agent that uses Composio tools to perform actions.",
    instruction=(
        "You are a helpful assistant connected to Composio. "
        "You have the following tools available: "
        "COMPOSIO_SEARCH_TOOLS, COMPOSIO_MULTI_EXECUTE_TOOL, "
        "COMPOSIO_MANAGE_CONNECTIONS, COMPOSIO_REMOTE_BASH_TOOL, COMPOSIO_REMOTE_WORKBENCH. "
        "Use these tools to help users with Smartlead operations."
    ),  
    tools=[composio_toolset],
)

print("\nAgent setup complete. You can now run this agent directly ;)")

Conclusion

You've successfully integrated Smartlead with the Google ADK through Composio's MCP Tool Router. Your agent can now interact with Smartlead using natural language commands.

Key takeaways:

  • The Tool Router approach dynamically routes requests to the appropriate Smartlead tools
  • Environment variables keep your credentials secure and separate from code
  • Clear agent instructions reduce tool calling errors
  • The ADK web UI provides an interactive interface for testing and development

You can extend this setup by adding more toolkits to the toolkits array in your session configuration.

TOOLS

Supported Tools

Every Smartlead action and event your agent gets out of the box.

Create Draft Campaign

Create a new campaign in DRAFTED status.

Create Smart Delivery Folder

Create an organizational folder for Smart Delivery tests.

Delete Campaign

Permanently delete a campaign and all associated sequences, mappings, and statistics.

Delete Smart Delivery Folder

Delete an empty Smart Delivery folder.

Get Campaign

Get configuration and performance summary for one Smartlead campaign by ID.

Get Campaigns

Get configuration and performance summaries for 1-20 Smartlead campaigns.

Get Smart Delivery Test

Get the documented configuration for one Smart Delivery spam test by ID.

Get Smart Prospect Usage

Get Smart Prospect lead-search metrics, fetch counts, daily limits, and available credit balance.

List Campaigns

List campaigns visible to the connected Smartlead account, optionally for one client.

List Smart Delivery Folders

List folders used to organize Smart Delivery tests.

List Smart Delivery Tests

List Smart Delivery spam and inbox-placement tests.

List Email Accounts

List connected sending accounts with health, warmup, usage, provider, and campaign filters.

List Inbox Replies

List lead replies across campaigns from Master Inbox using bounded filters and one page at a time.

List Smart Prospect Industries

List and search Smart Prospect industry filter values without searching contacts or consuming contact-fetch credits.

List Purchased Smart Senders Domains

List domains already purchased through Smart Senders.

List Saved Smart Prospect Searches

List saved Smart Prospect search definitions without executing them or consuming contact-search credits.

List Smart Senders Vendors

List Smart Senders marketplace vendors and current domain/mailbox pricing without placing an order.

Search Available Smart Senders Domains

Check Smart Senders marketplace domain availability for a vendor.

Search Smart Prospect Contacts (Consumes Credits)

Search one page of Smart Prospect contacts.

FRAMEWORKS

How to build Smartlead MCP Agent with another framework

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Smartlead MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use Smartlead MCP with Claude Agent SDK

Claude Code logo

Claude Code

Use Smartlead MCP with Claude Code

Claude Cowork logo

Claude Cowork

Use Smartlead MCP with Claude Cowork

Codex logo

Codex

Use Smartlead MCP with Codex

OpenClaw logo

OpenClaw

Use Smartlead MCP with OpenClaw

Hermes logo

Hermes

Use Smartlead MCP with Hermes

CLI logo

CLI

Use Smartlead MCP with CLI

LangChain logo

LangChain

Use Smartlead MCP with LangChain

Vercel AI SDK logo

Vercel AI SDK

Use Smartlead MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Smartlead MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Smartlead MCP with LlamaIndex

CrewAI logo

CrewAI

Use Smartlead MCP with CrewAI

FAQ

Frequently asked questions

With a standalone Smartlead MCP server, the agents and LLMs can only access a fixed set of Smartlead tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Smartlead and many other apps based on the task at hand, all through a single MCP endpoint.

Yes, you can. Google ADK fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right Smartlead tools.

Yes, absolutely. You can configure which Smartlead scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do.

All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your Smartlead data and credentials are handled as safely as possible.

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