# How to integrate Enginemailer MCP with Google ADK

```json
{
  "title": "How to integrate Enginemailer MCP with Google ADK",
  "toolkit": "Enginemailer",
  "toolkit_slug": "enginemailer",
  "framework": "Google ADK",
  "framework_slug": "google-adk",
  "url": "https://composio.dev/toolkits/enginemailer/framework/google-adk",
  "markdown_url": "https://composio.dev/toolkits/enginemailer/framework/google-adk.md",
  "updated_at": "2026-05-12T10:10:24.662Z"
}
```

## Introduction

This guide walks you through connecting Enginemailer to Google ADK using the Composio tool router. By the end, you'll have a working Enginemailer agent that can add new subscriber to newsletter list, pause tomorrow's scheduled marketing campaign, export email delivery report from last week through natural language commands.
This guide will help you understand how to give your Google ADK agent real control over a Enginemailer account through Composio's Enginemailer MCP server.
Before we dive in, let's take a quick look at the key ideas and tools involved.

## Also integrate Enginemailer with

- [OpenAI Agents SDK](https://composio.dev/toolkits/enginemailer/framework/open-ai-agents-sdk)
- [Claude Agent SDK](https://composio.dev/toolkits/enginemailer/framework/claude-agents-sdk)
- [Claude Code](https://composio.dev/toolkits/enginemailer/framework/claude-code)
- [Claude Cowork](https://composio.dev/toolkits/enginemailer/framework/claude-cowork)
- [Codex](https://composio.dev/toolkits/enginemailer/framework/codex)
- [OpenClaw](https://composio.dev/toolkits/enginemailer/framework/openclaw)
- [Hermes](https://composio.dev/toolkits/enginemailer/framework/hermes-agent)
- [CLI](https://composio.dev/toolkits/enginemailer/framework/cli)
- [LangChain](https://composio.dev/toolkits/enginemailer/framework/langchain)
- [Vercel AI SDK](https://composio.dev/toolkits/enginemailer/framework/ai-sdk)
- [Mastra AI](https://composio.dev/toolkits/enginemailer/framework/mastra-ai)
- [LlamaIndex](https://composio.dev/toolkits/enginemailer/framework/llama-index)
- [CrewAI](https://composio.dev/toolkits/enginemailer/framework/crew-ai)

## TL;DR

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

The Enginemailer MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Enginemailer account. It provides structured and secure access to your email marketing platform, so your agent can perform actions like creating campaigns, managing subscriber lists, exporting reports, and sending personalized email campaigns on your behalf.
- Campaign creation and scheduling: Direct your agent to set up new email campaigns, configure content, and schedule delivery to your audience.
- Subscriber management: Have your agent add new subscribers to your lists, including custom fields and segmentation for targeted outreach.
- Instant campaign delivery and controls: Command your agent to send campaigns immediately or pause scheduled campaigns for last-minute adjustments.
- Campaign monitoring and reporting: Let your agent export detailed email campaign reports as CSV files and check the status of ongoing exports.
- Audience segmentation and subcategory retrieval: Guide your agent to fetch subcategories and organize recipients for more personalized and effective campaigns.

## Supported Tools

| Tool slug | Name | Description |
|---|---|---|
| `ENGINEMAILER_ACTIVATE_SUBSCRIBER` | Activate Subscriber | Tool to activate an inactive subscriber in EngineMailer. Use when you need to reactivate a subscriber that was previously deactivated either through the API or manually. |
| `ENGINEMAILER_ADD_UPDATE_SUBSCRIBER` | Add or Update Subscriber | Tool to add or update a subscriber with custom fields via N8N integration. Use when you need to create a new subscriber or update an existing one in the EngineMailer system. |
| `ENGINEMAILER_BATCH_UPDATE_STATUS` | Check Batch Update Status | Tool to check the status of a batch subscriber update operation. Use when you need to verify if a batch update job has completed or is still processing. |
| `ENGINEMAILER_BATCH_UPDATE_SUBSCRIBERS` | Batch Update Subscribers | Tool to add or update multiple subscribers with custom fields in a single batch operation. Use when you need to create or update multiple subscribers efficiently. Subscribers that fail validation are removed from processing automatically. |
| `ENGINEMAILER_CHECK_EXPORT_STATUS_V2` | Check Export Status V2 | Tool to check status of a previously requested CSV report export. Use after initiating an export to poll for completion. Large exports may take significant time; poll repeatedly until status indicates readiness before consuming the export data. |
| `ENGINEMAILER_CONNECT` | Test API Connection | Tool to test API connection and verify authentication. Use when you need to validate API credentials or check connectivity. |
| `ENGINEMAILER_CREATE_CAMPAIGN` | Create Campaign | Tool to create a new email campaign. Use when you need to configure and schedule a campaign before sending. Set trackOpens and trackClicks at creation; these flags cannot retroactively affect already-delivered messages. |
| `ENGINEMAILER_DELETE_CAMPAIGN` | Delete Campaign | Tool to delete an undelivered email campaign. Use when you need to remove a campaign that has not been sent yet. |
| `ENGINEMAILER_DELETE_RECIPIENT_LIST` | Delete Recipient List | Tool to delete an existing recipient list from a targeted campaign. Use when you need to remove a specific recipient list from a campaign. |
| `ENGINEMAILER_DELETE_SUBSCRIBER` | Delete Subscriber | Tool to remove a subscriber from the system by email address. Use when you need to permanently delete a subscriber's record. |
| `ENGINEMAILER_EXPORT_CSV_REPORT_V2` | Export CSV Report V2 | Tool to export a transactional email report as CSV. Initiates an async export within a specific date range (max past 60 days); check readiness via ENGINEMAILER_CHECK_EXPORT_STATUS_V2 before using the export. |
| `ENGINEMAILER_FIND_SUBSCRIBER` | Find Subscriber | Tool to find a subscriber by email address via N8N integration. Use when you need to search for and retrieve subscriber information from the EngineMailer system. |
| `ENGINEMAILER_GET_GETCUSTOMFIELD` | Get Custom Field List | Tool to retrieve the list of custom fields configured for subscribers. Use when you need to discover available custom fields for subscriber management. |
| `ENGINEMAILER_GET_LISTCAMPAIGN` | Get List Campaign | Tool to get a list of undelivered campaigns. Use when you need to fetch campaigns awaiting delivery. |
| `ENGINEMAILER_GET_NEW_SUBSCRIBERS` | Get New Subscribers | Tool to retrieve new subscribers with optional filtering by source, form, page, or popup. Use when you need to fetch recently added subscribers for synchronization or reporting workflows. |
| `ENGINEMAILER_GET_SUBCATEGORY` | Get Subcategories | Tool to retrieve subcategories for a given category. Use when you need to list or choose subcategories after selecting a category. |
| `ENGINEMAILER_GET_SUBSCRIBER` | Get Subscriber | Tool to retrieve subscriber information by email address. Use when you need to fetch details about a specific subscriber including their custom fields. |
| `ENGINEMAILER_GET_SUBSCRIBER_AUTORESPONDER_COMPLETED` | Get Subscriber Autoresponder Completed | Tool to retrieve subscribers who completed autoresponders with optional filtering by autoresponder ID. Use when you need to fetch completion events for autoresponders, optionally filtered by specific autoresponder or polling for new events since a timestamp. |
| `ENGINEMAILER_GET_SUBSCRIBER_AUTORESPONDER_TRIGGERED` | Get Subscriber Autoresponder Triggered | Tool to retrieve subscribers who triggered autoresponders with optional filtering by autoresponder ID. Use when you need to fetch trigger events for autoresponders, optionally filtered by specific autoresponder or polling for new events since a timestamp. |
| `ENGINEMAILER_GET_SUBSCRIBERS_DELETED` | Get Deleted Subscribers | Tool to retrieve deleted subscribers since last polling date. Use when you need to track or sync subscribers who have been removed from the system. |
| `ENGINEMAILER_GET_SUBSCRIBERS_MODIFIED` | Get Subscribers Modified | Tool to retrieve modified subscribers since last polling date with optional limit. Use when you need to fetch recently modified subscribers for synchronization or polling workflows. |
| `ENGINEMAILER_GET_SUBSCRIBERS_TAGGED` | Get Subscribers Tagged | Tool to retrieve subscribers who were tagged with optional filtering by subcategory. Use when you need to fetch tagged subscribers for synchronization or reporting workflows. |
| `ENGINEMAILER_GET_SUBSCRIBERS_UNTAGGED` | Get Untagged Subscribers | Tool to retrieve subscribers who were untagged from subcategories. Use when you need to track or sync subscribers who have had tags removed, with optional filtering by subcategory and polling date. |
| `ENGINEMAILER_GET_UNSUBSCRIBE` | Get Unsubscribe Events | Tool to retrieve unsubscribe events with optional filtering by campaign or autoresponder. Use when you need to fetch unsubscribe data for reporting, synchronization, or compliance workflows. |
| `ENGINEMAILER_INSERT_SUBSCRIBER` | Insert Subscriber | Tool to add a new subscriber with optional custom fields. Use when registering a user to a specific mailing list after verifying their email. |
| `ENGINEMAILER_LIST_AUTORESPONDERS` | List Autoresponders | Tool to retrieve a list of all autoresponders. Use when you need to fetch available autoresponders configured in the system. |
| `ENGINEMAILER_LIST_CAMPAIGNS` | List Campaigns | Tool to retrieve a list of all campaigns. Use when you need to fetch all campaigns from the system. |
| `ENGINEMAILER_LIST_FORMS` | List Forms | Tool to retrieve a list of available forms in Enginemailer. Use when you need to discover forms for n8n integration or workflow configuration. |
| `ENGINEMAILER_LIST_PAGES` | List Pages | Tool to retrieve a list of all pages. Use when you need to fetch available pages. |
| `ENGINEMAILER_LIST_POPUPS` | List Popups | Tool to retrieve a list of popups from Enginemailer. Use when you need to fetch available popups for n8n workflows. |
| `ENGINEMAILER_LIST_TEMPLATES` | List Templates | Tool to retrieve a list of all email templates. Use when you need to fetch available email templates for campaigns. |
| `ENGINEMAILER_PAUSE_CAMPAIGN` | Pause Campaign | Tool to pause a scheduled email campaign. Use when you need to halt a campaign before sending to apply updates or adjust schedule. |
| `ENGINEMAILER_POST_UPDATECATEGORY` | Create/Update Category | Tool to create or update a category for subscriber segmentation. Use when organizing subscribers by common interests for targeted email marketing. |
| `ENGINEMAILER_POST_UPDATE_SUBSCRIBER` | Update Subscriber | Tool to update data for an existing subscriber in EngineMailer. Use when you need to modify subscriber information such as custom fields or subcategory assignments. |
| `ENGINEMAILER_SEND_CAMPAIGN` | Send Campaign | Tool to send an email campaign immediately. Use when the campaign exists, has at least one recipient, and is not scheduled or already delivered. E.g., 'Send campaign 123 now'. |
| `ENGINEMAILER_TAG_TO_SUBCATEGORY` | Tag Subscriber to Subcategory | Tool to tag a subscriber to a specific subcategory via N8N API endpoint. Use when you need to categorize or organize subscribers by assigning them to a subcategory. |
| `ENGINEMAILER_UNSUBSCRIBE` | Unsubscribe (N8N) | Tool to unsubscribe a subscriber via N8N API endpoint. Use when you need to remove a subscriber from the mailing list using the N8N integration endpoint. |
| `ENGINEMAILER_UNSUBSCRIBE_SUBSCRIBER` | Unsubscribe Subscriber | Tool to unsubscribe a subscriber from the email list. Use when a user requests to be removed from the mailing list or to comply with unsubscribe requests. |

## Supported Triggers

None listed.

## Creating MCP Server - Stand-alone vs Composio SDK

The Enginemailer MCP server is an implementation of the Model Context Protocol that connects your AI agent to Enginemailer. It provides structured and secure access so your agent can perform Enginemailer operations on your behalf through a secure, permission-based interface.
With Composio's managed implementation, you don't have to create your own developer app. For production, if you're building an end product, we recommend using your own credentials. The managed server helps you prototype fast and go from 0-1 faster.

## Step-by-step Guide

### 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

### 1. Getting API Keys for Google and Composio

Google API Key
- Go to [Google AI Studio](https://aistudio.google.com/app/apikey) 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](https://dashboard.composio.dev?utm_source=toolkits&utm_medium=framework_docs).
- 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.

### 2. Install dependencies

Inside your virtual environment, install the required packages.
What's happening:
- google-adk is Google's Agents Development Kit
- composio connects your agent to Enginemailer via MCP
- python-dotenv loads environment variables
```bash
pip install google-adk composio python-dotenv
```

### 3. Set up ADK project

Set up a new Google ADK project.
What's happening:
- This creates an agent folder with a root agent file and .env file
```bash
adk create my_agent
```

### 4. Set environment variables

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

### 5. Import modules and validate 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
```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.")
```

### 6. Create Composio client and Tool Router session

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
```python
composio_client = Composio(api_key=COMPOSIO_API_KEY)

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

COMPOSIO_MCP_URL = composio_session.mcp.url,
print(f"Composio MCP URL: {COMPOSIO_MCP_URL}")
```

### 7. Set up the McpToolset and create the Agent

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
```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 Enginemailer operations."
    ),
    tools=[composio_toolset],
)

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

### 8. Run the agent

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
```bash
# Run in CLI mode
adk run my_agent

# Or run in web UI mode
adk web
```

## Complete Code

```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=["enginemailer"],
)

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

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

## Conclusion

You've successfully integrated Enginemailer with the Google ADK through Composio's MCP Tool Router. Your agent can now interact with Enginemailer using natural language commands.
Key takeaways:
- The Tool Router approach dynamically routes requests to the appropriate Enginemailer 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 Enginemailer MCP Agent with another framework

- [OpenAI Agents SDK](https://composio.dev/toolkits/enginemailer/framework/open-ai-agents-sdk)
- [Claude Agent SDK](https://composio.dev/toolkits/enginemailer/framework/claude-agents-sdk)
- [Claude Code](https://composio.dev/toolkits/enginemailer/framework/claude-code)
- [Claude Cowork](https://composio.dev/toolkits/enginemailer/framework/claude-cowork)
- [Codex](https://composio.dev/toolkits/enginemailer/framework/codex)
- [OpenClaw](https://composio.dev/toolkits/enginemailer/framework/openclaw)
- [Hermes](https://composio.dev/toolkits/enginemailer/framework/hermes-agent)
- [CLI](https://composio.dev/toolkits/enginemailer/framework/cli)
- [LangChain](https://composio.dev/toolkits/enginemailer/framework/langchain)
- [Vercel AI SDK](https://composio.dev/toolkits/enginemailer/framework/ai-sdk)
- [Mastra AI](https://composio.dev/toolkits/enginemailer/framework/mastra-ai)
- [LlamaIndex](https://composio.dev/toolkits/enginemailer/framework/llama-index)
- [CrewAI](https://composio.dev/toolkits/enginemailer/framework/crew-ai)

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- [Bigmailer](https://composio.dev/toolkits/bigmailer) - BigMailer is an email marketing platform for managing multiple brands with white-labeling and automation. It helps teams streamline campaigns and simplify integration with Amazon SES.
- [Brandfetch](https://composio.dev/toolkits/brandfetch) - Brandfetch is an API that delivers company logos, colors, and visual branding assets. It helps marketers and developers keep brand visuals consistent everywhere.
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- [Campayn](https://composio.dev/toolkits/campayn) - Campayn is an email marketing platform for creating, sending, and managing campaigns. It helps businesses engage contacts and grow audiences with easy-to-use tools.
- [Cardly](https://composio.dev/toolkits/cardly) - Cardly is a platform for creating and sending personalized direct mail to customers. It helps businesses break through the digital clutter by getting real engagement via physical mailboxes.
- [ClickSend](https://composio.dev/toolkits/clicksend) - ClickSend is a cloud-based SMS and email marketing platform for businesses. It streamlines communication by enabling quick message delivery and contact management.
- [Crustdata](https://composio.dev/toolkits/crustdata) - CrustData is an AI-powered data intelligence platform for real-time company and people data. It helps B2B sales teams, AI SDRs, and investors react to live business signals.
- [Curated](https://composio.dev/toolkits/curated) - Curated is a platform for collecting, curating, and publishing newsletters. It streamlines content aggregation and distribution for creators and teams.
- [Customerio](https://composio.dev/toolkits/customerio) - Customer.io is a customer engagement platform for targeted messaging across email, SMS, and push. Easily automate, segment, and track communications with your audience.
- [Cutt ly](https://composio.dev/toolkits/cutt_ly) - Cutt.ly is a URL shortening service for managing and analyzing links. Streamline your workflows with quick, trackable, and branded short URLs.
- [Demio](https://composio.dev/toolkits/demio) - Demio is webinar software built for marketers, offering both live and automated sessions with interactive features. It helps teams engage audiences and optimize lead generation through detailed analytics.

## Frequently Asked Questions

### What are the differences in Tool Router MCP and Enginemailer MCP?

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

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

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

---
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