# How to integrate Mailtrap MCP with OpenAI Agents SDK

```json
{
  "title": "How to integrate Mailtrap MCP with OpenAI Agents SDK",
  "toolkit": "Mailtrap",
  "toolkit_slug": "mailtrap",
  "framework": "OpenAI Agents SDK",
  "framework_slug": "open-ai-agents-sdk",
  "url": "https://composio.dev/toolkits/mailtrap/framework/open-ai-agents-sdk",
  "markdown_url": "https://composio.dev/toolkits/mailtrap/framework/open-ai-agents-sdk.md",
  "updated_at": "2026-03-29T06:41:28.798Z"
}
```

## Introduction

This guide walks you through connecting Mailtrap to the OpenAI Agents SDK using the Composio tool router. By the end, you'll have a working Mailtrap agent that can send a test email to marketing team, list all emails sent from mailtrap today, create a new inbox for transactional testing through natural language commands.
This guide will help you understand how to give your OpenAI Agents SDK agent real control over a Mailtrap account through Composio's Mailtrap MCP server.
Before we dive in, let's take a quick look at the key ideas and tools involved.

## Also integrate Mailtrap with

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

## TL;DR

Here's what you'll learn:
- Get and set up your OpenAI and Composio API keys
- Install the necessary dependencies
- Initialize Composio and create a Tool Router session for Mailtrap
- Configure an AI agent that can use Mailtrap as a tool
- Run a live chat session where you can ask the agent to perform Mailtrap operations

## What is OpenAI Agents SDK?

The OpenAI Agents SDK is a lightweight framework for building AI agents that can use tools and maintain conversation state. It provides a simple interface for creating agents with hosted MCP tool support.
Key features include:
- Hosted MCP Tools: Connect to external services through hosted MCP endpoints
- SQLite Sessions: Persist conversation history across interactions
- Simple API: Clean interface with Agent, Runner, and tool configuration
- Streaming Support: Real-time response streaming for interactive applications

## What is the Mailtrap MCP server, and what's possible with it?

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

## Supported Tools

| Tool slug | Name | Description |
|---|---|---|
| `MAILTRAP_CLEAN_INBOX` | Clean Inbox | Tool to clean an inbox in Mailtrap by deleting all messages. Use when you need to remove all emails from an inbox while keeping the inbox itself. |
| `MAILTRAP_CREATE_CONTACT` | Create Contact | Tool to create a new contact in Mailtrap. Use when you need to add a contact with an email address to a Mailtrap account. Optionally include custom fields and assign to contact lists. |
| `MAILTRAP_CREATE_CONTACT_EVENT` | Create Contact Event | Tool to create a contact event in Mailtrap. Use when you need to track custom events associated with a contact for segmentation or automation triggers. |
| `MAILTRAP_CREATE_CONTACT_EXPORT` | Create Contact Export | Tool to create a contact export job for a Mailtrap account. Use when you need to export contacts with filters. The export is processed asynchronously - the response includes a job ID and status. Check the status field; when it becomes 'finished', the url field will contain the download link for the exported contacts file. Filters are required - you must specify at least one filter such as subscription_status (subscribed/unsubscribed) or list_id (array of list IDs). |
| `MAILTRAP_CREATE_CONTACT_FIELD` | Create Contact Field | Tool to create a custom contact field in Mailtrap. Use when you need to add new contact attributes for personalization and segmentation in email campaigns. |
| `MAILTRAP_CREATE_CONTACT_LIST` | Create Contact List | Tool to create a new contact list in Mailtrap. Use when you need to organize contacts into groups or segments. Each contact list has a unique ID and name that can be used to add contacts to it later. |
| `MAILTRAP_CREATE_EMAIL_TEMPLATE` | Create Email Template | Tool to create a new email template in Mailtrap account. Use when you need to create a reusable email template with HTML/text content, subject, and category. The template can be used for sending promotional, transactional, or newsletter emails. |
| `MAILTRAP_CREATE_SENDING_DOMAIN` | Create Sending Domain | Tool to create a new sending domain in Mailtrap. Use when you need to register a domain for sending transactional emails. After creation, DNS records must be configured before the domain can be used for sending. |
| `MAILTRAP_DELETE_CONTACT` | Delete Contact | Tool to delete a contact from a Mailtrap account. Use when you need to permanently remove a contact by their UUID or email address. The deletion is permanent and cannot be undone. |
| `MAILTRAP_DELETE_CONTACT_FIELD` | Delete Contact Field | Tool to delete a contact field by its ID. Use when you need to remove a custom contact field from an account. |
| `MAILTRAP_DELETE_CONTACT_LIST` | Delete Contact List | Tool to delete a contact list by its ID. Use when you need to remove a contact list from an account. |
| `MAILTRAP_DELETE_EMAIL_TEMPLATE` | Delete Email Template | Tool to delete an email template from a Mailtrap account. Use when you need to remove an existing email template. |
| `MAILTRAP_DELETE_PROJECT` | Delete Project | Tool to delete a project from Mailtrap. Use when you need to permanently remove a project and its associated resources. Returns the ID of the deleted project. |
| `MAILTRAP_DELETE_SENDING_DOMAIN` | Delete Sending Domain | Tool to delete a sending domain from a Mailtrap account. Use when you need to remove a domain permanently. |
| `MAILTRAP_GET_BILLING_USAGE` | Get Billing Usage | Tool to retrieve current billing cycle usage for an account. Use when you need to check billing information, usage limits, or consumption for Email Sandbox and Email Sending services. |
| `MAILTRAP_GET_CONTACT` | Get Contact | Tool to retrieve a contact by UUID or email address from Mailtrap. Use when you need to fetch details of a specific contact including their subscription status, lists, and custom fields. |
| `MAILTRAP_GET_CONTACT_EXPORT` | Get Contact Export | Tool to retrieve the status of a contact export. Use when you need to check the progress of an export or download the exported contacts file. |
| `MAILTRAP_GET_CONTACT_FIELD` | Get Contact Field | Tool to retrieve contact field details by field ID. Use when you need to get information about a specific custom field in your contacts. |
| `MAILTRAP_GET_CONTACT_IMPORT_STATUS` | Get Contact Import Status | Tool to retrieve the status of a contact import operation. Use when you need to check the progress or completion status of a contact import. Use after initiating a contact import to monitor its status and retrieve statistics once finished. |
| `MAILTRAP_GET_CONTACT_LIST` | Get Contact List | Tool to retrieve a specific contact list by its ID. Use when you need to fetch details about a contact list in a Mailtrap account. |
| `MAILTRAP_GET_EMAIL_TEMPLATE` | Get Email Template | Tool to retrieve details of a specific email template by ID. Use when you need to fetch template content, metadata, or configuration for an existing email template. |
| `MAILTRAP_GET_INBOX_ATTRIBUTES` | Get Inbox Attributes | Tool to retrieve inbox attributes from Mailtrap. Use when you need to get details about a specific inbox including its configuration, statistics, and permissions. |
| `MAILTRAP_GET_MESSAGE_HTML_BODY` | Get Message HTML Body | Tool to retrieve the HTML body of a message from Mailtrap. Use when you need to get the formatted HTML content of a specific email message. |
| `MAILTRAP_GET_PERMISSION_RESOURCES` | Get Permission Resources | Tool to retrieve all resources in account for permission management. Use when you need to see the hierarchical structure of projects, inboxes, and other resources with their access levels for the current authentication token. |
| `MAILTRAP_GET_PROJECT_BY_ID` | Get Project by ID | Tool to retrieve project details from Mailtrap by project ID. Use when you need to get information about a specific project including its inboxes, permissions, and share links. |
| `MAILTRAP_GET_SENDING_DOMAIN` | Get Sending Domain | Tool to retrieve sending domain details from Mailtrap. Use when you need to check domain configuration, DNS verification status, or tracking settings. |
| `MAILTRAP_GET_SENDING_STATS` | Get Sending Stats | Tool to retrieve email sending statistics from Mailtrap for a specific account. Use when you need metrics like delivery rate, bounce rate, open rate, click rate, and spam rate for a date range. |
| `MAILTRAP_GET_SENDING_STATS_BY_CATEGORIES` | Get Sending Stats by Categories | Tool to retrieve email sending statistics grouped by categories. Use when you need to analyze email performance metrics (delivery, bounce, open, click, spam rates) segmented by email categories within a date range. |
| `MAILTRAP_GET_SENDING_STATS_BY_DATE` | Get Sending Stats by Date | Tool to retrieve email sending statistics aggregated by date. Use when you need to analyze email delivery performance, bounce rates, open rates, click rates, and spam rates for a specific date range. |
| `MAILTRAP_GET_SENDING_STATS_BY_DOMAINS` | Get Sending Stats by Domains | Tool to retrieve sending statistics grouped by domains for a Mailtrap account. Use when you need email delivery, bounce, open, click, and spam metrics broken down by sending domain for a specific date range. Supports filtering by domain IDs, sending streams, categories, and email service providers. |
| `MAILTRAP_GET_SENDING_STATS_BY_ESP` | Get Sending Stats by ESP | Tool to retrieve email sending statistics grouped by email service providers (ESPs) for a specified date range. Returns delivery, bounce, open, click, and spam metrics for each ESP. Use when you need to analyze email performance across different email providers like Google, Yahoo, Microsoft, etc. |
| `MAILTRAP_IMPORT_CONTACTS` | Import Contacts | Tool to import contacts in bulk to Mailtrap. Use when you need to add or update multiple contacts at once. The import operation is asynchronous and returns a job ID that can be used to check the status later. |
| `MAILTRAP_LIST_ACCOUNTS` | List Accounts | Tool to list all Mailtrap accounts you have access to. Use when you need to retrieve account information or get account IDs for other operations. Returns account ID, name, and access levels (1000=owner, 100=admin, 10=viewer). |
| `MAILTRAP_LIST_CONTACT_FIELDS` | List Contact Fields | Tool to get all contact fields for a Mailtrap account. Use when you need to retrieve custom field definitions for contacts. |
| `MAILTRAP_LIST_CONTACT_LISTS` | List Contact Lists | Tool to retrieve all contact lists for a Mailtrap account. Use when you need to view available contact lists or obtain contact list IDs for other operations. |
| `MAILTRAP_LIST_EMAIL_TEMPLATES` | List Email Templates | Tool to retrieve all email templates for a Mailtrap account. Use when you need to list available templates, browse template configurations, or find a specific template by name or attributes. |
| `MAILTRAP_LIST_INBOXES` | List Inboxes | Tool to get a list of inboxes for a Mailtrap account. Use when you need to retrieve all inboxes associated with an account ID. Returns the list of inboxes with their configuration, permissions, and statistics. |
| `MAILTRAP_LIST_MESSAGES_IN_INBOX` | List Messages in Inbox | Tool to get messages from a Mailtrap inbox. Use when you need to retrieve emails from a specific inbox, with support for search filtering and pagination. Returns up to 30 messages per request. |
| `MAILTRAP_LIST_PROJECTS` | List Projects | Tool to get a list of projects for a Mailtrap account. Use when you need to retrieve all projects and their associated inboxes for a specific account. Returns project attributes, permissions, and nested inbox information. |
| `MAILTRAP_LIST_SENDING_DOMAINS` | List Sending Domains | Tool to list all sending domains for a Mailtrap account. Use when you need to retrieve configured domains for email sending. |
| `MAILTRAP_LIST_EMAIL_SUPPRESSIONS` | List Email Suppressions | Tool to list suppressed email addresses for a Mailtrap account. Use when you need to view which emails are blocked from receiving messages due to bounces, complaints, unsubscribes, or manual suppression. |
| `MAILTRAP_MARK_INBOX_AS_READ` | Mark Inbox as Read | Tool to mark all messages in a Mailtrap inbox as read. Use when you need to mark all unread messages as read in a specific inbox. |
| `MAILTRAP_RESET_INBOX_CREDENTIALS` | Reset Inbox Credentials | Tool to reset SMTP credentials for a Mailtrap inbox. Use when you need to regenerate the username and password for inbox access. |
| `MAILTRAP_UPDATE_CONTACT` | Update contact | Tool to update an existing contact in Mailtrap. Use when you need to modify contact details such as email, custom fields, list memberships, or subscription status. If the contact doesn't exist, it will be created. |
| `MAILTRAP_UPDATE_CONTACT_FIELD` | Update Contact Field | Tool to update a contact field in Mailtrap. Use when you need to modify the name or merge tag of an existing contact field. |
| `MAILTRAP_UPDATE_CONTACT_LIST` | Update Contact List | Tool to update a contact list's name in Mailtrap. Use when you need to rename an existing contact list. |
| `MAILTRAP_UPDATE_EMAIL_TEMPLATE` | Update Email Template | Tool to update an existing email template in Mailtrap account. Use when you need to modify template properties such as name, subject, category, HTML body, or plain text body. All fields in the email_template object are optional - only provide the fields you want to update. |
| `MAILTRAP_UPDATE_INBOX` | Update inbox | Tool to update an inbox's settings in Mailtrap. Use when you need to change the inbox name or email username. |
| `MAILTRAP_UPDATE_PROJECT` | Update project | Tool to update a project's name in Mailtrap. Use when you need to rename an existing project. |

## Supported Triggers

None listed.

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

The Mailtrap MCP server is an implementation of the Model Context Protocol that connects your AI agent to Mailtrap. It provides structured and secure access so your agent can perform Mailtrap 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:
- Composio API Key and OpenAI API Key
- Primary know-how of OpenAI Agents SDK
- A live Mailtrap project
- Some knowledge of Python or Typescript

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

OpenAI API Key
- Go to the [OpenAI dashboard](https://platform.openai.com/settings/organization/api-keys) and create an API key. You'll need credits to use the models, or you can connect to another model provider.
- Keep the API key safe.
Composio API Key
- Log in to the [Composio dashboard](https://dashboard.composio.dev?utm_source=toolkits&utm_medium=framework_docs).
- Go to Settings and copy your API key.

### 2. Install dependencies

Install the Composio SDK and the OpenAI Agents SDK.
```python
pip install composio_openai_agents openai-agents python-dotenv
```

```typescript
npm install @composio/openai-agents @openai/agents dotenv
```

### 3. Set up environment variables

Create a .env file and add your OpenAI and Composio API keys.
```bash
OPENAI_API_KEY=sk-...your-api-key
COMPOSIO_API_KEY=your-api-key
USER_ID=composio_user@gmail.com
```

### 4. Import dependencies

What's happening:
- You're importing all necessary libraries.
- The Composio and OpenAIAgentsProvider classes are imported to connect your OpenAI agent to Composio tools like Mailtrap.
```python
import asyncio
import os
from dotenv import load_dotenv

from composio import Composio
from composio_openai_agents import OpenAIAgentsProvider
from agents import Agent, Runner, HostedMCPTool, SQLiteSession
```

```typescript
import 'dotenv/config';
import { Composio } from '@composio/core';
import { OpenAIAgentsProvider } from '@composio/openai-agents';
import { Agent, hostedMcpTool, run, OpenAIConversationsSession } from '@openai/agents';
import * as readline from 'readline';
```

### 5. Set up the Composio instance

No description provided.
```python
load_dotenv()

api_key = os.getenv("COMPOSIO_API_KEY")
user_id = os.getenv("USER_ID")

if not api_key:
    raise RuntimeError("COMPOSIO_API_KEY is not set. Create a .env file with COMPOSIO_API_KEY=your_key")

# Initialize Composio
composio = Composio(api_key=api_key, provider=OpenAIAgentsProvider())
```

```typescript
dotenv.config();

const composioApiKey = process.env.COMPOSIO_API_KEY;
const userId = process.env.USER_ID;

if (!composioApiKey) {
  throw new Error('COMPOSIO_API_KEY is not set. Create a .env file with COMPOSIO_API_KEY=your_key');
}
if (!userId) {
  throw new Error('USER_ID is not set');
}

// Initialize Composio
const composio = new Composio({
  apiKey: composioApiKey,
  provider: new OpenAIAgentsProvider(),
});
```

### 6. Create a Tool Router session

What is happening:
- You give the Tool Router the user id and the toolkits you want available. Here, it is only mailtrap.
- The router checks the user's Mailtrap connection and prepares the MCP endpoint.
- The returned session.mcp.url is the MCP URL that your agent will use to access Mailtrap.
- This approach keeps things lightweight and lets the agent request Mailtrap tools only when needed during the conversation.
```python
# Create a Mailtrap Tool Router session
session = composio.create(
    user_id=user_id,
    toolkits=["mailtrap"]
)

mcp_url = session.mcp.url
```

```typescript
// Create Tool Router session for Mailtrap
const session = await composio.create(userId as string, {
  toolkits: ['mailtrap'],
});
const mcpUrl = session.mcp.url;
```

### 7. Configure the agent

No description provided.
```python
# Configure agent with MCP tool
agent = Agent(
    name="Assistant",
    model="gpt-5",
    instructions=(
        "You are a helpful assistant that can access Mailtrap. "
        "Help users perform Mailtrap operations through natural language."
    ),
    tools=[
        HostedMCPTool(
            tool_config={
                "type": "mcp",
                "server_label": "tool_router",
                "server_url": mcp_url,
                "headers": {"x-api-key": api_key},
                "require_approval": "never",
            }
        )
    ],
)
```

```typescript
// Configure agent with MCP tool
const agent = new Agent({
  name: 'Assistant',
  model: 'gpt-5',
  instructions:
    'You are a helpful assistant that can access Mailtrap. Help users perform Mailtrap operations through natural language.',
  tools: [
    hostedMcpTool({
      serverLabel: 'tool_router',
      serverUrl: mcpUrl,
      headers: { 'x-api-key': composioApiKey },
      requireApproval: 'never',
    }),
  ],
});
```

### 8. Start chat loop and handle conversation

No description provided.
```python
print("\nComposio Tool Router session created.")

chat_session = SQLiteSession("conversation_openai_toolrouter")

print("\nChat started. Type your requests below.")
print("Commands: 'exit', 'quit', or 'q' to end\n")

async def main():
    try:
        result = await Runner.run(
            agent,
            "What can you help me with?",
            session=chat_session
        )
        print(f"Assistant: {result.final_output}\n")
    except Exception as e:
        print(f"Error: {e}\n")

    while True:
        user_input = input("You: ").strip()
        if user_input.lower() in {"exit", "quit", "q"}:
            print("Goodbye!")
            break

        result = await Runner.run(
            agent,
            user_input,
            session=chat_session
        )
        print(f"Assistant: {result.final_output}\n")

asyncio.run(main())
```

```typescript
// Keep conversation state across turns
const conversationSession = new OpenAIConversationsSession();

// Simple CLI
const rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout,
  prompt: 'You: ',
});

console.log('\nComposio Tool Router session created.');
console.log('\nChat started. Type your requests below.');
console.log("Commands: 'exit', 'quit', or 'q' to end\n");

try {
  const first = await run(agent, 'What can you help me with?', { session: conversationSession });
  console.log(`Assistant: ${first.finalOutput}\n`);
} catch (e) {
  console.error('Error:', e instanceof Error ? e.message : e, '\n');
}

rl.prompt();

rl.on('line', async (userInput) => {
  const text = userInput.trim();

  if (['exit', 'quit', 'q'].includes(text.toLowerCase())) {
    console.log('Goodbye!');
    rl.close();
    process.exit(0);
  }

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

  try {
    const result = await run(agent, text, { session: conversationSession });
    console.log(`\nAssistant: ${result.finalOutput}\n`);
  } catch (e) {
    console.error('Error:', e instanceof Error ? e.message : e, '\n');
  }

  rl.prompt();
});

rl.on('close', () => {
  console.log('\n👋 Session ended.');
  process.exit(0);
});
```

## Complete Code

```python
import asyncio
import os
from dotenv import load_dotenv

from composio import Composio
from composio_openai_agents import OpenAIAgentsProvider
from agents import Agent, Runner, HostedMCPTool, SQLiteSession

load_dotenv()

api_key = os.getenv("COMPOSIO_API_KEY")
user_id = os.getenv("USER_ID")

if not api_key:
    raise RuntimeError("COMPOSIO_API_KEY is not set. Create a .env file with COMPOSIO_API_KEY=your_key")

# Initialize Composio
composio = Composio(api_key=api_key, provider=OpenAIAgentsProvider())

# Create Tool Router session
session = composio.create(
    user_id=user_id,
    toolkits=["mailtrap"]
)
mcp_url = session.mcp.url

# Configure agent with MCP tool
agent = Agent(
    name="Assistant",
    model="gpt-5",
    instructions=(
        "You are a helpful assistant that can access Mailtrap. "
        "Help users perform Mailtrap operations through natural language."
    ),
    tools=[
        HostedMCPTool(
            tool_config={
                "type": "mcp",
                "server_label": "tool_router",
                "server_url": mcp_url,
                "headers": {"x-api-key": api_key},
                "require_approval": "never",
            }
        )
    ],
)

print("\nComposio Tool Router session created.")

chat_session = SQLiteSession("conversation_openai_toolrouter")

print("\nChat started. Type your requests below.")
print("Commands: 'exit', 'quit', or 'q' to end\n")

async def main():
    try:
        result = await Runner.run(
            agent,
            "What can you help me with?",
            session=chat_session
        )
        print(f"Assistant: {result.final_output}\n")
    except Exception as e:
        print(f"Error: {e}\n")

    while True:
        user_input = input("You: ").strip()
        if user_input.lower() in {"exit", "quit", "q"}:
            print("Goodbye!")
            break

        result = await Runner.run(
            agent,
            user_input,
            session=chat_session
        )
        print(f"Assistant: {result.final_output}\n")

asyncio.run(main())
```

```typescript
import 'dotenv/config';
import { Composio } from '@composio/core';
import { OpenAIAgentsProvider } from '@composio/openai-agents';
import { Agent, hostedMcpTool, run, OpenAIConversationsSession } from '@openai/agents';
import * as readline from 'readline';

const composioApiKey = process.env.COMPOSIO_API_KEY;
const userId = process.env.USER_ID;

if (!composioApiKey) {
  throw new Error('COMPOSIO_API_KEY is not set. Create a .env file with COMPOSIO_API_KEY=your_key');
}
if (!userId) {
  throw new Error('USER_ID is not set');
}

// Initialize Composio
const composio = new Composio({
  apiKey: composioApiKey,
  provider: new OpenAIAgentsProvider(),
});

async function main() {
  // Create Tool Router session
  const session = await composio.create(userId as string, {
    toolkits: ['mailtrap'],
  });
  const mcpUrl = session.mcp.url;

  // Configure agent with MCP tool
  const agent = new Agent({
    name: 'Assistant',
    model: 'gpt-5',
    instructions:
      'You are a helpful assistant that can access Mailtrap. Help users perform Mailtrap operations through natural language.',
    tools: [
      hostedMcpTool({
        serverLabel: 'tool_router',
        serverUrl: mcpUrl,
        headers: { 'x-api-key': composioApiKey },
        requireApproval: 'never',
      }),
    ],
  });

  // Keep conversation state across turns
  const conversationSession = new OpenAIConversationsSession();

  // Simple CLI
  const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout,
    prompt: 'You: ',
  });

  console.log('\nComposio Tool Router session created.');
  console.log('\nChat started. Type your requests below.');
  console.log("Commands: 'exit', 'quit', or 'q' to end\n");

  try {
    const first = await run(agent, 'What can you help me with?', { session: conversationSession });
    console.log(`Assistant: ${first.finalOutput}\n`);
  } catch (e) {
    console.error('Error:', e instanceof Error ? e.message : e, '\n');
  }

  rl.prompt();

  rl.on('line', async (userInput) => {
    const text = userInput.trim();

    if (['exit', 'quit', 'q'].includes(text.toLowerCase())) {
      console.log('Goodbye!');
      rl.close();
      process.exit(0);
    }

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

    try {
      const result = await run(agent, text, { session: conversationSession });
      console.log(`\nAssistant: ${result.finalOutput}\n`);
    } catch (e) {
      console.error('Error:', e instanceof Error ? e.message : e, '\n');
    }

    rl.prompt();
  });

  rl.on('close', () => {
    console.log('\nSession ended.');
    process.exit(0);
  });
}

main().catch((err) => {
  console.error('Fatal error:', err);
  process.exit(1);
});
```

## Conclusion

This was a starter code for integrating Mailtrap MCP with OpenAI Agents SDK to build a functional AI agent that can interact with Mailtrap.
Key features:
- Hosted MCP tool integration through Composio's Tool Router
- SQLite session persistence for conversation history
- Simple async chat loop for interactive testing
You can extend this by adding more toolkits, implementing custom business logic, or building a web interface around the agent.

## How to build Mailtrap MCP Agent with another framework

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

## Related Toolkits

- [Google Sheets](https://composio.dev/toolkits/googlesheets) - Google Sheets is a cloud-based spreadsheet tool for real-time collaboration and data analysis. It lets teams work together from anywhere, updating information instantly.
- [Notion](https://composio.dev/toolkits/notion) - Notion is a collaborative workspace for notes, docs, wikis, and tasks. It streamlines team knowledge, project tracking, and workflow customization in one place.
- [Airtable](https://composio.dev/toolkits/airtable) - Airtable combines the flexibility of spreadsheets with the power of a database for easy project and data management. Teams use Airtable to organize, track, and collaborate with custom views and automations.
- [Asana](https://composio.dev/toolkits/asana) - Asana is a collaborative work management platform for teams to organize and track projects. It streamlines teamwork, boosts productivity, and keeps everyone aligned on goals.
- [Google Tasks](https://composio.dev/toolkits/googletasks) - Google Tasks is a to-do list and task management tool integrated into Gmail and Google Calendar. It helps you organize, track, and complete tasks across your Google ecosystem.
- [Linear](https://composio.dev/toolkits/linear) - Linear is a modern issue tracking and project planning tool for fast-moving teams. It helps streamline workflows, organize projects, and boost productivity.
- [Jira](https://composio.dev/toolkits/jira) - Jira is Atlassian’s platform for bug tracking, issue tracking, and agile project management. It helps teams organize work, prioritize tasks, and deliver projects efficiently.
- [Clickup](https://composio.dev/toolkits/clickup) - ClickUp is an all-in-one productivity platform for managing tasks, docs, goals, and team collaboration. It streamlines project workflows so teams can work smarter and stay organized in one place.
- [Monday](https://composio.dev/toolkits/monday) - Monday.com is a customizable work management platform for project planning and collaboration. It helps teams organize tasks, automate workflows, and track progress in real time.
- [Addressfinder](https://composio.dev/toolkits/addressfinder) - Addressfinder is a data quality platform for verifying addresses, emails, and phone numbers. It helps you ensure accurate customer and contact data every time.
- [Agiled](https://composio.dev/toolkits/agiled) - Agiled is an all-in-one business management platform for CRM, projects, and finance. It helps you streamline workflows, consolidate client data, and manage business processes in one place.
- [Ascora](https://composio.dev/toolkits/ascora) - Ascora is a cloud-based field service management platform for service businesses. It streamlines scheduling, invoicing, and customer operations in one place.
- [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.
- [Beeminder](https://composio.dev/toolkits/beeminder) - Beeminder is an online goal-tracking platform that uses monetary pledges to keep you motivated. Stay accountable and hit your targets with real financial incentives.
- [Boxhero](https://composio.dev/toolkits/boxhero) - Boxhero is a cloud-based inventory management platform for SMBs, offering real-time updates, barcode scanning, and team collaboration. It helps businesses streamline stock tracking and analytics for smarter inventory decisions.
- [Breathe HR](https://composio.dev/toolkits/breathehr) - Breathe HR is cloud-based HR software for SMEs to manage employee data, absences, and performance. It simplifies HR admin, making it easy to keep employee records accurate and up to date.
- [Breeze](https://composio.dev/toolkits/breeze) - Breeze is a project management platform designed to help teams plan, track, and collaborate on projects. It streamlines workflows and keeps everyone on the same page.
- [Bugherd](https://composio.dev/toolkits/bugherd) - Bugherd is a visual feedback and bug tracking tool for websites. It helps teams and clients report website issues directly on live sites for faster fixes.
- [Canny](https://composio.dev/toolkits/canny) - Canny is a platform for managing customer feedback and feature requests. It helps teams prioritize product decisions based on real user insights.
- [Chmeetings](https://composio.dev/toolkits/chmeetings) - Chmeetings is a church management platform for events, members, donations, and volunteers. It streamlines church operations and improves community engagement.

## Frequently Asked Questions

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

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

### Can I use Tool Router MCP with OpenAI Agents SDK?

Yes, you can. OpenAI Agents SDK 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 Mailtrap tools.

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

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

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[See all toolkits](https://composio.dev/toolkits) · [Composio docs](https://docs.composio.dev/llms.txt)