# How to integrate Gmail MCP with Google ADK

```json
{
  "title": "How to integrate Gmail MCP with Google ADK",
  "toolkit": "Gmail",
  "toolkit_slug": "gmail",
  "framework": "Google ADK",
  "framework_slug": "google-adk",
  "url": "https://composio.dev/toolkits/gmail/framework/google-adk",
  "markdown_url": "https://composio.dev/toolkits/gmail/framework/google-adk.md",
  "updated_at": "2026-05-06T08:13:39.350Z"
}
```

## Introduction

This guide walks you through connecting Gmail to Google ADK using the Composio tool router. By the end, you'll have a working Gmail agent that can read emails, search your inbox, draft messages, manage labels, and organize threads through natural language commands.
This guide will help you understand how to give your Google ADK agent real control over a Gmail account through Composio's Gmail MCP server.
Before we dive in, let's take a quick look at the key ideas and tools involved.

## Also integrate Gmail with

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

## TL;DR

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

The Gmail MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Gmail account. It provides structured and secure access to your email, so your agent can search, read, draft, organize, and even manage contacts in your mailbox—all on your behalf.
- Advanced email search and retrieval: Effortlessly instruct your agent to fetch emails by sender, subject, label, date, or keywords, and even retrieve full message content or threads.
- Automated drafting and sending: Have your agent create new email drafts, craft replies, add CC/BCC, include attachments, and handle threading to streamline communication.
- Smart label and inbox organization: Let the agent create new labels, apply or remove labels from emails, and keep your inbox clutter-free by archiving or moving messages.
- Contact and thread management: Fetch your Gmail contacts, pull entire conversation threads, or download specific attachments to make follow-ups a breeze.
- Email and draft cleanup: Direct your agent to permanently delete emails or drafts, helping you maintain a tidy mailbox with minimal effort.

## Supported Tools

| Tool slug | Name | Description |
|---|---|---|
| `GMAIL_ADD_LABEL_TO_EMAIL` | Modify email labels | Adds and/or removes specified gmail labels for a message; ensure `message id` and all `label ids` are valid (use 'listlabels' for custom label ids). |
| `GMAIL_CREATE_EMAIL_DRAFT` | Create email draft | Creates a gmail email draft, supporting to/cc/bcc, subject, plain/html body (ensure `is html=true` for html), attachments, and threading. |
| `GMAIL_CREATE_LABEL` | Create label | Creates a new label with a unique name in the specified user's gmail account. |
| `GMAIL_DELETE_DRAFT` | Delete Draft | Permanently deletes a specific gmail draft using its id; ensure the draft exists and the user has necessary permissions for the given `user id`. |
| `GMAIL_DELETE_MESSAGE` | Delete message | Permanently deletes a specific email message by its id from a gmail mailbox; for `user id`, use 'me' for the authenticated user or an email address to which the authenticated user has delegated access. |
| `GMAIL_FETCH_EMAILS` | Fetch emails | Fetches a list of email messages from a gmail account, supporting filtering, pagination, and optional full content retrieval. |
| `GMAIL_FETCH_MESSAGE_BY_MESSAGE_ID` | Fetch message by message ID | Fetches a specific email message by its id, provided the `message id` exists and is accessible to the authenticated `user id`. |
| `GMAIL_FETCH_MESSAGE_BY_THREAD_ID` | Fetch Message by Thread ID | Retrieves messages from a gmail thread using its `thread id`, where the thread must be accessible by the specified `user id`. |
| `GMAIL_GET_ATTACHMENT` | Get Gmail attachment | Retrieves a specific attachment by id from a message in a user's gmail mailbox, requiring valid message and attachment ids. |
| `GMAIL_GET_CONTACTS` | Get contacts | Fetches contacts (connections) for the authenticated google account, allowing selection of specific data fields and pagination. |
| `GMAIL_GET_PEOPLE` | Get People | Retrieves either a specific person's details (using `resource name`) or lists 'other contacts' (if `other contacts` is true), with `person fields` specifying the data to return. |
| `GMAIL_GET_PROFILE` | Get Profile | Retrieves key gmail profile information (email address, message/thread totals, history id) for a user. |
| `GMAIL_LIST_DRAFTS` | List drafts | Retrieves a paginated list of email drafts from a user's gmail account. use verbose=true to get full draft details including subject, body, sender, and timestamp. |
| `GMAIL_LIST_LABELS` | List Gmail labels | Retrieves a list of all system and user-created labels for the specified gmail account. |
| `GMAIL_LIST_THREADS` | List threads | Retrieves a list of email threads from a gmail account, identified by `user id` (email address or 'me'), supporting filtering and pagination. |
| `GMAIL_MODIFY_THREAD_LABELS` | Modify thread labels | Adds or removes specified existing label ids from a gmail thread, affecting all its messages; ensure the thread id is valid. |
| `GMAIL_MOVE_TO_TRASH` | Move to Trash | Moves an existing, non-deleted email message to the trash for the specified user. |
| `GMAIL_PATCH_LABEL` | Patch Label | Patches the specified label. |
| `GMAIL_REMOVE_LABEL` | Remove label | Permanently deletes a specific, existing user-created gmail label by its id for a user; cannot delete system labels. |
| `GMAIL_REPLY_TO_THREAD` | Reply to email thread | Sends a reply within a specific gmail thread using the original thread's subject, requiring a valid `thread id` and correctly formatted email addresses. supports attachments via the `attachment` parameter with valid `s3key`, `mimetype`, and `name`. |
| `GMAIL_SEARCH_PEOPLE` | Search People | Searches contacts by matching the query against names, nicknames, emails, phone numbers, and organizations, optionally including 'other contacts'. |
| `GMAIL_SEND_DRAFT` | Send Draft | Sends the specified, existing draft to the recipients in the to, cc, and bcc headers. |
| `GMAIL_SEND_EMAIL` | Send Email | Sends an email via gmail api using the authenticated user's google profile display name, requiring `is html=true` if the body contains html and valid `s3key`, `mimetype`, `name` for any attachment. |

## Supported Triggers

| Trigger slug | Name | Description |
|---|---|---|
| `GMAIL_EMAIL_SENT_TRIGGER` | Email Sent | Triggers when a Gmail message is sent by the authenticated user. It polls the 'SENT' label and emits metadata including sender, recipients, subject, timestamp, and thread ID. |
| `GMAIL_NEW_GMAIL_MESSAGE` | New Gmail Message Received Trigger | Triggers when a new message is received in Gmail. |

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

The Gmail MCP server is an implementation of the Model Context Protocol that connects your AI agent to Gmail. It provides structured and secure access so your agent can perform Gmail 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 Gmail 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=["gmail"],
)

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 Gmail 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=["gmail"],
)

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

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

## Conclusion

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

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

## Related Toolkits

- [Outlook](https://composio.dev/toolkits/outlook) - Outlook is Microsoft's email and calendaring platform for unified communications and scheduling. It helps users stay organized with powerful email, contacts, and calendar management.
- [Slack](https://composio.dev/toolkits/slack) - Slack is a channel-based messaging platform for teams and organizations. It helps people collaborate in real time, share files, and connect all their tools in one place.
- [Gong](https://composio.dev/toolkits/gong) - Gong is a platform for video meetings, call recording, and team collaboration. It helps teams capture conversations, analyze calls, and turn insights into action.
- [Microsoft teams](https://composio.dev/toolkits/microsoft_teams) - Microsoft Teams is a collaboration platform that combines chat, meetings, and file sharing within Microsoft 365. It keeps distributed teams connected and productive through seamless virtual communication.
- [Slackbot](https://composio.dev/toolkits/slackbot) - Slackbot is a conversational automation tool for Slack that handles reminders, notifications, and automated responses. It boosts team productivity by streamlining onboarding, answering FAQs, and managing timely alerts—all right inside Slack.
- [2chat](https://composio.dev/toolkits/_2chat) - 2chat is an API platform for WhatsApp and multichannel text messaging. It streamlines chat automation, group management, and real-time messaging for developers.
- [Agent mail](https://composio.dev/toolkits/agent_mail) - Agent mail provides AI agents with dedicated email inboxes for sending, receiving, and managing emails. It empowers agents to communicate autonomously with people, services, and other agents—no human intervention needed.
- [Basecamp](https://composio.dev/toolkits/basecamp) - Basecamp is a project management and team collaboration tool by 37signals. It helps teams organize tasks, share files, and communicate efficiently in one place.
- [Chatwork](https://composio.dev/toolkits/chatwork) - Chatwork is a team communication platform with group chats, file sharing, and task management. It helps businesses boost collaboration and streamline productivity.
- [Clickmeeting](https://composio.dev/toolkits/clickmeeting) - ClickMeeting is a cloud-based platform for running online meetings and webinars. It helps businesses and individuals host, manage, and engage virtual audiences with ease.
- [Confluence](https://composio.dev/toolkits/confluence) - Confluence is Atlassian's team collaboration and knowledge management platform. It helps your team organize, share, and update documents and project content in one secure workspace.
- [Dailybot](https://composio.dev/toolkits/dailybot) - DailyBot streamlines team collaboration with chat-based standups, reminders, and polls. It keeps work flowing smoothly in your favorite messaging platforms.
- [Dialmycalls](https://composio.dev/toolkits/dialmycalls) - Dialmycalls is a mass notification service for sending voice and text messages to contacts. It helps teams and organizations quickly broadcast urgent alerts and updates.
- [Dialpad](https://composio.dev/toolkits/dialpad) - Dialpad is a cloud-based business phone and contact center system for teams. It unifies voice, video, messaging, and meetings across your devices.
- [Discord](https://composio.dev/toolkits/discord) - Discord is a real-time messaging and VoIP platform for communities and teams. It lets users chat, share media, and collaborate across public and private channels.
- [Discordbot](https://composio.dev/toolkits/discordbot) - Discordbot is an automation tool for Discord servers that handles moderation, messaging, and user engagement. It helps communities run smoothly by automating routine and complex tasks.
- [Echtpost](https://composio.dev/toolkits/echtpost) - Echtpost is a secure digital communication platform for encrypted document and message exchange. It ensures confidential data stays private and protected during transmission.
- [Egnyte](https://composio.dev/toolkits/egnyte) - Egnyte is a cloud-based platform for secure file sharing, storage, and governance. It helps teams collaborate efficiently while maintaining data compliance and security.
- [Google Meet](https://composio.dev/toolkits/googlemeet) - Google Meet is a secure video conferencing platform for virtual meetings, chat, and screen sharing. It helps teams connect, collaborate, and communicate seamlessly from anywhere.
- [Heartbeat](https://composio.dev/toolkits/heartbeat) - Heartbeat is a plug-and-play platform for building and managing online communities. It helps you organize users, channels, events, and discussions in one place.

## Frequently Asked Questions

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

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

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

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

---
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