How to integrate Etermin MCP with Google ADK

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Introduction

This guide walks you through connecting Etermin to Google ADK using the Composio tool router. By the end, you'll have a working Etermin agent that can add new client contact for booking, remove canceled appointment from calendar, create voucher for returning customer through natural language commands.

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

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

Also integrate Etermin with

TL;DR

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

The Etermin MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Etermin account. It provides structured and secure access to your appointment scheduling system, so your agent can perform actions like creating contacts, managing bookings, updating resources, and handling calendar events on your behalf.

  • Automated contact and user creation: Instantly add new clients or team members to your Etermin account, streamlining onboarding and customer management.
  • Effortless appointment and calendar management: Let your agent delete existing appointments or calendars, freeing up schedules and reducing manual work.
  • Resource and service administration: Automatically create or remove resources and services, ensuring your booking system stays current as your business evolves.
  • Voucher and webhook setup: Quickly generate new vouchers for promotions or set up webhooks for real-time event notifications and integrations.
  • Contact and service deletion: Easily remove outdated contacts or services, keeping your scheduling platform organized and clutter-free.

Supported Tools & Triggers

Tools
Assign Calendar ServiceTool to assign a service to a calendar in eTermin.
Create AbsenceTool to create an absence (non-working time) for a specific calendar.
Create AnchortimeTool to create anchortimes (recurring time slots) in a calendar.
Create Anchortime by DateTool to create anchortimes by date.
Create AppointmentTool to create a new appointment in eTermin.
Create Appointment via SyncTool to create an appointment via sync in eTermin.
Create Calendar Return TimeTool to create a return time for a calendar.
Create ContactTool to create a new contact in eTermin.
Create ServiceTool to create a new service in eTermin.
Create Service GroupTool to create a new service group in eTermin.
Create UserTool to create a new user.
Create UsermappingTool to create a new usermapping in eTermin.
Create VoucherCreates a new discount voucher in eTermin.
Create WebhookCreates a webhook (web push notification) in eTermin to receive real-time updates about appointments.
Create Working TimeTool to create a new working time slot in eTermin.
Create Working Times DateTool to create a working times date slot for a calendar.
Delete AbsenceTool to delete an absence (non-working time) from a calendar.
Delete AnchortimeDelete an anchortime from eTermin by its ID.
Delete Anchortime By DateDelete an anchortime by date using its ID.
Delete AppointmentDelete an existing appointment by its ID.
Delete Appointment via SyncTool to delete appointments via the sync endpoint.
Delete CalendarDelete a calendar from your eTermin account.
Delete Calendar Return TimeDelete a return time from a calendar.
Delete Calendar ServiceDelete an assigned service from a calendar in eTermin.
Delete ContactDelete a contact from your eTermin account by its contact ID.
Delete ResourceDelete an eTermin resource by type and ID.
Delete ServicePermanently deletes a service from your eTermin account by its ID.
Delete Service GroupDelete a service group from your eTermin account by its ID.
Delete UserDeletes an existing user from the eTermin account.
Delete UsermappingDelete a usermapping by its ID.
Delete VoucherPermanently deletes a voucher from eTermin by its voucher code.
Delete WebhookDelete an existing webhook by its unique identifier.
Delete Working TimesTool to delete working times from a calendar.
Delete Working Times DateTool to delete working times date entries from eTermin.
Get AbsencesTool to retrieve absences (non-working times) for a specific calendar.
Get Anchortime by DateTool to retrieve anchortimes by date.
Get AnchortimesTool to retrieve anchortime details.
Get Appointment SyncTool to synchronize appointments incrementally from eTermin.
Get Bookingpage LogsTool to retrieve bookingpage request logs from eTermin.
Get Calendar Return TimeTool to retrieve return times for a specific calendar.
Get CalendarsTool to retrieve calendars.
Get Calendar Service AssignmentsTool to retrieve calendar service assignments.
Get CompanyTool to retrieve company account details.
Get Contact By IDTool to retrieve a specific contact by ID, external ID, or email.
Get ContactsTool to retrieve a list of contacts.
Get Deleted AppointmentsTool to retrieve a list of deleted appointments from eTermin.
Get Message LogsTool to retrieve message logs from eTermin.
Get Customer RatingsTool to retrieve a list of customer ratings from eTermin.
Get Service By IDTool to retrieve a specific service from eTermin.
Get Service CalendarTool to retrieve calendars for a specific service ID.
Get Service GroupTool to retrieve service group details from eTermin.
Get ServicesTool to retrieve a list of services.
Get Survey ResultsTool to retrieve survey results from eTermin.
Get TimeslotsTool to retrieve available timeslots for a specific calendar on a given date.
Get UsermappingTool to retrieve usermapping information.
Get UsersTool to retrieve a list of users.
Get Working TimesTool to retrieve working times for a specific calendar.
Get Working Times DateTool to retrieve working times for a specific calendar on a specific date.
List AppointmentsTool to retrieve a filtered list of appointments from eTermin in a specified date range.
List VouchersRetrieve all vouchers (discount codes) from your eTermin account.
List WebhooksTool to retrieve webhooks.
Update Service via PUTTool to update a service in eTermin.
Update AbsenceTool to update an absence (non-working time) for a calendar in eTermin.
Update AnchortimeUpdate an existing anchortime in eTermin.
Update Anchortime By DateTool to update anchortimes by date in eTermin.
Update AppointmentTool to update an existing appointment in eTermin.
Update CalendarUpdate an existing calendar in eTermin.
Update Calendar Return TimeTool to update a return time for a calendar in eTermin.
Update ContactTool to update an existing contact in eTermin.
Update ResourceUpdate an existing eTermin resource (contact, service, calendar, user, or voucher).
Update ServiceTool to update an existing service.
Update Service GroupTool to update an existing service group in eTermin.
Update Synchronised AppointmentTool to update a synchronised appointment in eTermin.
Update UsermappingUpdate an existing usermapping in eTermin.
Update VoucherUpdates an existing voucher in eTermin.
Update WebhookUpdate an existing webhook configuration in eTermin.
Update Working TimesTool to update working times for a calendar in eTermin.
Update Working Times DateTool to update working times date for a calendar.

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

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 Etermin 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=["etermin"],
)

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 Etermin 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 Etermin 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=["etermin"],
)

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

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

Conclusion

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

Key takeaways:

  • The Tool Router approach dynamically routes requests to the appropriate Etermin 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 Etermin MCP Agent with another framework

FAQ

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

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

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

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

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Entelligence
Rolai

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