How to integrate Etermin MCP with Mastra AI

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Introduction

This guide walks you through connecting Etermin to Mastra AI 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 Mastra AI 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:
  • Set up your environment so Mastra, OpenAI, and Composio work together
  • Create a Tool Router session in Composio that exposes Etermin tools
  • Connect Mastra's MCP client to the Composio generated MCP URL
  • Fetch Etermin tool definitions and attach them as a toolset
  • Build a Mastra agent that can reason, call tools, and return structured results
  • Run an interactive CLI where you can chat with your Etermin agent

What is Mastra AI?

Mastra AI is a TypeScript framework for building AI agents with tool support. It provides a clean API for creating agents that can use external services through MCP.

Key features include:

  • MCP Client: Built-in support for Model Context Protocol servers
  • Toolsets: Organize tools into logical groups
  • Step Callbacks: Monitor and debug agent execution
  • OpenAI Integration: Works with OpenAI models via @ai-sdk/openai

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:
  • Node.js 18 or higher
  • A Composio account with an active API key
  • An OpenAI API key
  • Basic familiarity with TypeScript

Getting API Keys for OpenAI and Composio

OpenAI API Key
  • Go to the OpenAI dashboard and create an API key.
  • You need credits or a connected billing setup to use the models.
  • Store the key somewhere safe.
Composio API Key
  • Log in to the Composio dashboard.
  • Go to Settings and copy your API key.
  • This key lets your Mastra agent talk to Composio and reach Etermin through MCP.

Install dependencies

bash
npm install @composio/core @mastra/core @mastra/mcp @ai-sdk/openai dotenv

Install the required packages.

What's happening:

  • @composio/core is the Composio SDK for creating MCP sessions
  • @mastra/core provides the Agent class
  • @mastra/mcp is Mastra's MCP client
  • @ai-sdk/openai is the model wrapper for OpenAI
  • dotenv loads environment variables from .env

Set up environment variables

bash
COMPOSIO_API_KEY=your_composio_api_key_here
COMPOSIO_USER_ID=your_user_id_here
OPENAI_API_KEY=your_openai_api_key_here

Create a .env file in your project root.

What's happening:

  • COMPOSIO_API_KEY authenticates your requests to Composio
  • COMPOSIO_USER_ID tells Composio which user this session belongs to
  • OPENAI_API_KEY lets the Mastra agent call OpenAI models

Import libraries and validate environment

typescript
import "dotenv/config";
import { openai } from "@ai-sdk/openai";
import { Agent } from "@mastra/core/agent";
import { MCPClient } from "@mastra/mcp";
import { Composio } from "@composio/core";
import * as readline from "readline";

import type { AiMessageType } from "@mastra/core/agent";

const openaiAPIKey = process.env.OPENAI_API_KEY;
const composioAPIKey = process.env.COMPOSIO_API_KEY;
const composioUserID = process.env.COMPOSIO_USER_ID;

if (!openaiAPIKey) throw new Error("OPENAI_API_KEY is not set");
if (!composioAPIKey) throw new Error("COMPOSIO_API_KEY is not set");
if (!composioUserID) throw new Error("COMPOSIO_USER_ID is not set");

const composio = new Composio({
  apiKey: composioAPIKey as string,
});
What's happening:
  • dotenv/config auto loads your .env so process.env.* is available
  • openai gives you a Mastra compatible model wrapper
  • Agent is the Mastra agent that will call tools and produce answers
  • MCPClient connects Mastra to your Composio MCP server
  • Composio is used to create a Tool Router session

Create a Tool Router session for Etermin

typescript
async function main() {
  const session = await composio.create(
    composioUserID as string,
    {
      toolkits: ["etermin"],
    },
  );

  const composioMCPUrl = session.mcp.url;
  console.log("Etermin MCP URL:", composioMCPUrl);
What's happening:
  • create spins up a short-lived MCP HTTP endpoint for this user
  • The toolkits array contains "etermin" for Etermin access
  • session.mcp.url is the MCP URL that Mastra's MCPClient will connect to

Configure Mastra MCP client and fetch tools

typescript
const mcpClient = new MCPClient({
    id: composioUserID as string,
    servers: {
      nasdaq: {
        url: new URL(composioMCPUrl),
        requestInit: {
          headers: session.mcp.headers,
        },
      },
    },
    timeout: 30_000,
  });

console.log("Fetching MCP tools from Composio...");
const composioTools = await mcpClient.getTools();
console.log("Number of tools:", Object.keys(composioTools).length);
What's happening:
  • MCPClient takes an id for this client and a list of MCP servers
  • The headers property includes the x-api-key for authentication
  • getTools fetches the tool definitions exposed by the Etermin toolkit

Create the Mastra agent

typescript
const agent = new Agent({
    name: "etermin-mastra-agent",
    instructions: "You are an AI agent with Etermin tools via Composio.",
    model: "openai/gpt-5",
  });
What's happening:
  • Agent is the core Mastra agent
  • name is just an identifier for logging and debugging
  • instructions guide the agent to use tools instead of only answering in natural language
  • model uses openai("gpt-5") to configure the underlying LLM

Set up interactive chat interface

typescript
let messages: AiMessageType[] = [];

console.log("Chat started! Type 'exit' or 'quit' to end.\n");

const rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout,
  prompt: "> ",
});

rl.prompt();

rl.on("line", async (userInput: string) => {
  const trimmedInput = userInput.trim();

  if (["exit", "quit", "bye"].includes(trimmedInput.toLowerCase())) {
    console.log("\nGoodbye!");
    rl.close();
    process.exit(0);
  }

  if (!trimmedInput) {
    rl.prompt();
    return;
  }

  messages.push({
    id: crypto.randomUUID(),
    role: "user",
    content: trimmedInput,
  });

  console.log("\nAgent is thinking...\n");

  try {
    const response = await agent.generate(messages, {
      toolsets: {
        etermin: composioTools,
      },
      maxSteps: 8,
    });

    const { text } = response;

    if (text && text.trim().length > 0) {
      console.log(`Agent: ${text}\n`);
        messages.push({
          id: crypto.randomUUID(),
          role: "assistant",
          content: text,
        });
      }
    } catch (error) {
      console.error("\nError:", error);
    }

    rl.prompt();
  });

  rl.on("close", async () => {
    console.log("\nSession ended.");
    await mcpClient.disconnect();
    process.exit(0);
  });
}

main().catch((err) => {
  console.error("Fatal error:", err);
  process.exit(1);
});
What's happening:
  • messages keeps the full conversation history in Mastra's expected format
  • agent.generate runs the agent with conversation history and Etermin toolsets
  • maxSteps limits how many tool calls the agent can take in a single run
  • onStepFinish is a hook that prints intermediate steps for debugging

Complete Code

Here's the complete code to get you started with Etermin and Mastra AI:

typescript
import "dotenv/config";
import { openai } from "@ai-sdk/openai";
import { Agent } from "@mastra/core/agent";
import { MCPClient } from "@mastra/mcp";
import { Composio } from "@composio/core";
import * as readline from "readline";

import type { AiMessageType } from "@mastra/core/agent";

const openaiAPIKey = process.env.OPENAI_API_KEY;
const composioAPIKey = process.env.COMPOSIO_API_KEY;
const composioUserID = process.env.COMPOSIO_USER_ID;

if (!openaiAPIKey) throw new Error("OPENAI_API_KEY is not set");
if (!composioAPIKey) throw new Error("COMPOSIO_API_KEY is not set");
if (!composioUserID) throw new Error("COMPOSIO_USER_ID is not set");

const composio = new Composio({ apiKey: composioAPIKey as string });

async function main() {
  const session = await composio.create(composioUserID as string, {
    toolkits: ["etermin"],
  });

  const composioMCPUrl = session.mcp.url;

  const mcpClient = new MCPClient({
    id: composioUserID as string,
    servers: {
      etermin: {
        url: new URL(composioMCPUrl),
        requestInit: {
          headers: session.mcp.headers,
        },
      },
    },
    timeout: 30_000,
  });

  const composioTools = await mcpClient.getTools();

  const agent = new Agent({
    name: "etermin-mastra-agent",
    instructions: "You are an AI agent with Etermin tools via Composio.",
    model: "openai/gpt-5",
  });

  let messages: AiMessageType[] = [];

  const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout,
    prompt: "> ",
  });

  rl.prompt();

  rl.on("line", async (input: string) => {
    const trimmed = input.trim();
    if (["exit", "quit"].includes(trimmed.toLowerCase())) {
      rl.close();
      return;
    }

    messages.push({ id: crypto.randomUUID(), role: "user", content: trimmed });

    const { text } = await agent.generate(messages, {
      toolsets: { etermin: composioTools },
      maxSteps: 8,
    });

    if (text) {
      console.log(`Agent: ${text}\n`);
      messages.push({ id: crypto.randomUUID(), role: "assistant", content: text });
    }

    rl.prompt();
  });

  rl.on("close", async () => {
    await mcpClient.disconnect();
    process.exit(0);
  });
}

main();

Conclusion

You've built a Mastra AI agent that can interact with Etermin through Composio's Tool Router. You can extend this further by:
  • Adding other toolkits like Gmail, Slack, or GitHub
  • Building a web-based chat interface around this agent
  • Using multiple MCP endpoints to enable cross-app workflows

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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 Mastra AI?

Yes, you can. Mastra AI 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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