How to integrate Mixmax MCP with Google ADK

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Introduction

This guide walks you through connecting Mixmax to Google ADK using the Composio tool router. By the end, you'll have a working Mixmax agent that can get all mixmax emails tracked today, send a mixmax sequence to new leads, list mixmax meetings scheduled for next week through natural language commands.

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

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

TL;DR

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

The Mixmax MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Mixmax account. It provides structured and secure access so your agent can perform Mixmax operations on your behalf.

Supported Tools & Triggers

Tools
Add Contact to GroupTool to add a contact to a contact group.
Add Email to Unsubscribe ListTool to add an email address to the Mixmax unsubscribe list.
Add Snippet to TagTool to add a snippet to a snippet tag in Mixmax.
Add Team MembersTool to add one or more members to a Mixmax team by email.
Cancel Sequence RecipientsTool to cancel specific recipients across all sequences.
Create Code SnippetTool to create a new Formatted Code enhancement in Mixmax.
Create ContactTool to create a new contact in Mixmax.
Create Contact GroupTool to create a new contact group in Mixmax.
Create Contact NoteTool to create a note for a contact.
Create insights reportTool to create a new insights report in Mixmax.
Create Integration EnhancementTool to create a new enhancement integration in Mixmax.
Create Integrations CommandTool to create a new slash command that will be visible to only your account.
Create Integrations SidebarsTool to create a new sidebar integration in Mixmax.
Create Link ResolverTool to create a new link resolver integration in Mixmax.
Create Livefeed SearchTool to create a new saved search in the Mixmax livefeed.
Create MessageTool to create a draft Mixmax message (email).
Create RuleTool to create a new Mixmax rule/webhook.
Create Rule ActionTool to create a new action for a Mixmax rule.
Create Sequence FolderTool to create a new sequence folder in Mixmax.
Create Snippet TagTool to create a new snippet tag (folder) in Mixmax.
Create TeamTool to create a new team in Mixmax.
Delete ContactTool to delete a contact by ID.
Delete Contact GroupTool to delete a contact group by ID.
Delete Contact NoteTool to delete a note from a contact by its ID.
Delete Integration EnhancementTool to delete an integration enhancement by its ID.
Delete slash commandTool to delete a slash command by its unique ID from Mixmax integrations.
Delete Integrations SidebarsTool to delete a sidebar integration by its ID.
Delete Link ResolverTool to permanently delete a link resolver by its ID.
Delete RuleTool to delete a Mixmax rule by its ID.
Delete Rule ActionTool to delete an action from a Mixmax rule.
Delete Sequence FolderTool to permanently delete a sequence folder by its ID.
Delete SnippetTool to delete a snippet by moving it to trash.
Delete Snippet TagTool to delete a snippet tag by its unique ID.
Delete TeamTool to delete a team by its ID.
Delete UnsubscribeTool to remove an email address from the Mixmax unsubscribe list.
Get Code SnippetTool to fetch a single Formatted Code enhancement by its unique ID.
Get contact by IDTool to retrieve a single contact by ID from Mixmax.
Get Contact GroupTool to retrieve a single contact group by ID.
Get Contactgroup ContactsTool to retrieve membership for a contact group in Mixmax.
Get Contact NotesTool to retrieve notes associated with a specific contact.
Get File RequestsTool to retrieve all file requests that you've sent out through Mixmax.
Get insights report by IDTool to retrieve a single insights report by ID from Mixmax.
Get Integrations CommandsTool to retrieve a list of Slash Commands that you have access to in Mixmax.
Get Integrations EnhancementsTool to retrieve a list of enhancements that you have access to in Mixmax.
Get Link Resolver IntegrationsTool to retrieve all link resolver integrations configured in Mixmax.
Get Integrations SidebarsTool to retrieve a list of sidebar integrations that you have access to in Mixmax.
Get live feed activity dataTool to retrieve live feed activity data from Mixmax.
Get Livefeed EventsTool to retrieve events for a specific message in the live feed.
Get Meeting InvitesTool to retrieve a paginated list of meeting invites from Mixmax.
Get Message by IDTool to retrieve a single message by its unique ID.
Get MessagesTool to retrieve messages (emails) from Mixmax.
Get PollsTool to retrieve polls created in Mixmax along with voting information.
Get Q&A SurveysTool to retrieve Question & Answer surveys data from Mixmax.
Get Reports Data TableTool to query analytics data for messages and meetings from Mixmax reports.
Get all rulesTool to retrieve all Mixmax rules for the authenticated user.
Get Rule by IDTool to fetch a single rule by its unique ID from Mixmax.
Get Salesforce account informationTool to retrieve Salesforce account information for the authenticated user.
Get Sequence Folder by IDTool to retrieve a single sequence folder by its ID from Mixmax.
Get Snippet by IDTool to fetch a single snippet by its unique ID from Mixmax.
Get Snippet TagTool to retrieve a single snippet tag (folder) by its unique ID.
Get Snippet TagsTool to retrieve a list of snippet tags (folders) from Mixmax.
Get Team MembersTool to retrieve all members of a Mixmax team.
Get TeamsTool to retrieve all teams that the authenticated user is a member of.
Get UnsubscribesTool to retrieve a list of unsubscribed email addresses from Mixmax.
Get Current User PreferencesTool to retrieve preferences for the currently authenticated user.
Get Current UserTool to retrieve information about the currently authenticated user.
Get Yes/No QuestionsTool to retrieve Yes/No questions created in Mixmax.
List Code SnippetsTool to list all Formatted Code enhancements you've created.
List Contact GroupsTool to retrieve a list of contact groups from Mixmax.
List ContactsTool to retrieve all Mixmax contacts (people you've emailed using Mixmax).
List insights reportsTool to retrieve all insights reports from Mixmax.
List Rule ActionsTool to list all actions for a given Mixmax rule.
List Sequence FoldersTool to retrieve a list of all sequence folders from Mixmax.
List SequencesTool to retrieve a list of sequences from Mixmax.
List SnippetsTool to list templates or snippets that you have access to (including those shared with you).
Update Rule by IDTool to update a rule by its unique ID in Mixmax.
Update Rule ActionTool to update an action within a Mixmax rule.
Update Snippet by IDTool to update a snippet by its unique ID in Mixmax.
Post Reports Data TableTool to generate a table report with specified analytics data for messages, meetings, or sequences.
Query ContactsTool to search for matching contacts across multiple sources including Mixmax, Google Directory, and Salesforce (contacts, leads, accounts, and opportunities).
Remove Contact from GroupTool to remove a contact from a contact group.
Remove Team MemberTool to remove a member from a Mixmax team.
Search SequencesTool to search sequence recipients by email and sequenceId from Mixmax.
Send Message DraftTool to send a message draft by its unique ID.
Send Snippet as EmailTool to send a snippet as an email to specified recipients.
Send Test MessageTool to send a test Mixmax message to the authenticated user, resolving any variables.
Update Appointment Link Calendar NameTool to update your custom "Mixmax Calendar" vanity URL name.
Update ContactTool to update a specific contact by ID.
Update Contact GroupTool to update a contact group by ID.
Update Contact NoteTool to update a note on a contact by its ID.
Update insights reportTool to update an existing insights report in Mixmax.
Update Message by IDTool to update a message by its unique ID.
Update Sequence Folder by IDTool to update a sequence folder by its unique ID in Mixmax.
Update Snippet TagTool to update a snippet tag (folder) by its unique ID.
Update TeamTool to update a team's information by ID.
Update Current User PreferencesTool to update preferences for the currently authenticated user.

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

What is Tool Router?

Composio's Tool Router 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 Tool Router

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

How the Tool Router works

The Tool Router 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

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

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.

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 Mixmax via MCP
  • python-dotenv loads environment variables

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

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

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

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=["mixmax"],
)

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

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 Mixmax 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

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 Mixmax 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=["mixmax"],
)

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

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

Conclusion

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

Key takeaways:

  • The Tool Router approach dynamically routes requests to the appropriate Mixmax 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.

How to build Mixmax MCP Agent with another framework

FAQ

What are the differences in Tool Router MCP and Mixmax MCP?

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

Can I use Tool Router MCP with Google ADK?

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 Mixmax tools.

Can I manage the permissions and scopes for Mixmax while using Tool Router?

Yes, absolutely. You can configure which Mixmax 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.

How safe is my data with Composio Tool Router?

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 Mixmax data and credentials are handled as safely as possible.

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