How to integrate ApexVerify MCP with Google ADK

This guide walks you through connecting ApexVerify to Google ADK using the Composio tool router. By the end, you'll have a working ApexVerify agent that can validate new signup emails before import, normalize phone numbers for crm records, check batch contacts for invalid data through natural language commands. This guide will help you understand how to give your Google ADK agent real control over a ApexVerify account through Composio's ApexVerify MCP server. Before we dive in, let's take a quick look at the key ideas and tools involved.

Get started for freeGet a demo
ApexVerify logoApexVerify
Api Key

ApexVerify is a contact-data validation service for emails and phone numbers. Use it to normalize, verify, and clean leads before they enter your systems.

10 Tools

Introduction

This guide walks you through connecting ApexVerify to Google ADK using the Composio tool router. By the end, you'll have a working ApexVerify agent that can validate new signup emails before import, normalize phone numbers for crm records, check batch contacts for invalid data through natural language commands.

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

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

Also integrate ApexVerify with

OpenAI Agents SDKClaude Agent SDKClaude CodeClaude CoworkCodexOpenClawHermesCLILangChainVercel AI SDKMastra AILlamaIndexCrewAI

TL;DR

Here's what you'll learn:
  • Get a ApexVerify account set up and connected to Composio
  • Install the Google ADK and Composio packages
  • Create a Composio Tool Router session for ApexVerify
  • Build an agent that connects to ApexVerify through MCP
  • Interact with ApexVerify 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 ApexVerify MCP server, and what's possible with it?

The ApexVerify MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your ApexVerify account. It provides structured and secure access to contact verification and normalization, so your agent can verify individual contacts, process batches, export results, monitor credits, and manage verification jobs on your behalf.

  • Real-time contact verification: Have your agent verify a single email address or phone number and report whether the contact information is valid.
  • Batch verification management: Let the agent upload contact files, prepare them through parsing and deduplication, estimate verification costs, and launch paid verification.
  • Contact data normalization: Direct your agent to clean and normalize email addresses or phone numbers from line-delimited text files without using verification credits.
  • Batch tracking and exports: Instruct your agent to list batches, review their status and final statistics, and export completed results as structured JSON or an XLSX workbook.
  • Credit and batch cleanup: Have your agent check available email and phone verification credits or permanently delete batches you no longer need.

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 ApexVerify 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=["apexverify"],
)

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 ApexVerify 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 ApexVerify 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=["apexverify"],
)

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 ApexVerify operations."
    ),  
    tools=[composio_toolset],
)

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

Conclusion

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

Key takeaways:

  • The Tool Router approach dynamically routes requests to the appropriate ApexVerify 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 ApexVerify action and event your agent gets out of the box.

Delete Batch

Permanently delete one ApexVerify batch by its exact UUID.

Export Batch Results

Export a completed batch as structured JSON for analysis or as a downloadable XLSX workbook.

Get Account Credits

Return the connected ApexVerify account's available email and phone verification credit balances.

Get Batch Details

Get an ApexVerify batch's status, metadata, parsed-content counts, estimated verification cost, parameters, and final statistics.

Launch Batch Verification

Launch paid verification for a prepared batch.

List Batches

List verification batches, optionally restricted by creation time, one offset-controlled page at a time.

Normalize Data File

Normalize email addresses or phone numbers from a line-delimited TXT file without performing verification or consuming verification credits.

Prepare Batch

Start or repeat asynchronous parsing, deduplication, format cleanup, and verification-cost calculation for an uploaded batch.

Upload Verification Batch

Create an ApexVerify verification batch from a line-delimited TXT file.

Verify Email or Phone

Verify one email address or phone number in real time.

FRAMEWORKS

How to build ApexVerify MCP Agent with another framework

OpenAI Agents SDK logo

OpenAI Agents SDK

Use ApexVerify MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use ApexVerify MCP with Claude Agent SDK

Claude Code logo

Claude Code

Use ApexVerify MCP with Claude Code

Claude Cowork logo

Claude Cowork

Use ApexVerify MCP with Claude Cowork

Codex logo

Codex

Use ApexVerify MCP with Codex

OpenClaw logo

OpenClaw

Use ApexVerify MCP with OpenClaw

Hermes logo

Hermes

Use ApexVerify MCP with Hermes

CLI logo

CLI

Use ApexVerify MCP with CLI

LangChain logo

LangChain

Use ApexVerify MCP with LangChain

Vercel AI SDK logo

Vercel AI SDK

Use ApexVerify MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use ApexVerify MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use ApexVerify MCP with LlamaIndex

CrewAI logo

CrewAI

Use ApexVerify MCP with CrewAI

FAQ

Frequently asked questions

With a standalone ApexVerify MCP server, the agents and LLMs can only access a fixed set of ApexVerify tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from ApexVerify 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 ApexVerify tools.

Yes, absolutely. You can configure which ApexVerify 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 ApexVerify data and credentials are handled as safely as possible.

Start with ApexVerify.It takes 30 seconds.

Managed auth, hosted MCP servers, and every ApexVerify tool your agent needs.Free to start.

Start building
Customer stories

Teams ship real agents on Composio

GET STARTED FOR FREEBOOK A DEMO
agent.aiZoomLettaGleanHubSpotAWSWabi

Karan skipped his own birthday party to fix our critical issue. It was 10pm and he diverted his Waymo to help us instead. This really sets the bar — it shows the commitment you need when users rely on your software.

Harsha Gaddipati
Harsha Gaddipati
Co-founder, Slashy

A lot of students tell us that the moment their connected tools start talking to each other inside Opennote feels almost magical. The agent just knows them, and it's immensely helped keep new users on the platform.

Abhi Arya
Abhi Arya
Co-founder, Opennote

We chose Composio over Pipedream because it delivered depth where it mattered — niche tools and tricky edge cases other platforms simply ignored. That gave us confidence to scale without compromising.

Nirman Dave
Nirman Dave
CEO, Zams

As a solo builder, shipping fast is life or death. The only way I can outcompete incumbents is by outmanoeuvring them. Getting bogged down managing agent auth would have been a death sentence.

Ryan Yu
Ryan Yu
Founder, Extra Thursday

Before Composio, adding tool integrations was slow and resource-intensive. Each one could take weeks of engineering time, and maintaining them meant constantly keeping up with API changes.

Tomisin Jenrola
Tomisin Jenrola
Founder & CEO, SwarmZero

With hands-on help from their founder, we integrated Gmail and Google Drive in just 30 minutes. This level of personal support and commitment is exactly what startups should strive for.

Jerome Leclanche
Jerome Leclanche
Co-Founder, Ingram Technologies