How to integrate Mixmax MCP with OpenAI Agents SDK

This guide walks you through connecting Mixmax to the OpenAI Agents SDK using the Composio tool router. By the end, you'll have a working Mixmax agent that can get all mixmax emails tracked today, send a mixmax sequence to new leads, list mixmax meetings scheduled for next week through natural language commands. This guide will help you understand how to give your OpenAI Agents SDK agent real control over a Mixmax account through Composio's Mixmax MCP server. Before we dive in, let's take a quick look at the key ideas and tools involved.

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Introduction

This guide walks you through connecting Mixmax to the OpenAI Agents SDK using the Composio tool router. By the end, you'll have a working Mixmax agent that can get all mixmax emails tracked today, send a mixmax sequence to new leads, list mixmax meetings scheduled for next week through natural language commands.

This guide will help you understand how to give your OpenAI Agents SDK agent real control over a Mixmax account through Composio's Mixmax MCP server.

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

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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 Mixmax
  • Configure an AI agent that can use Mixmax as a tool
  • Run a live chat session where you can ask the agent to perform Mixmax 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 Mixmax MCP server, and what's possible with it?

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

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

Step by step09 STEPS
1

Prerequisites

Before starting, make sure you have:
  • Composio API Key and OpenAI API Key
  • Primary know-how of OpenAI Agents SDK
  • A live Mixmax project
  • Some knowledge of Python or Typescript
2

Getting API Keys for OpenAI and Composio

OpenAI API Key
  • Go to the OpenAI dashboard 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
3

Install dependencies

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

Install the Composio SDK and the OpenAI Agents SDK.

4

Set up environment variables

bash
OPENAI_API_KEY=sk-...your-api-key
COMPOSIO_API_KEY=your-api-key
USER_ID=composio_user@gmail.com

Create a .env file and add your OpenAI and Composio API keys.

5

Import dependencies

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';
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 Mixmax.
6

Set up the Composio instance

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(),
});
What's happening:
  • dotenv.config() loads your .env file so COMPOSIO_API_KEY and USER_ID are available as environment variables.
  • Creating a Composio instance using the API Key and OpenAIAgentsProvider class.
7

Create a Tool Router session

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

What is happening:

  • You give the Tool Router the user id and the toolkits you want available. Here, it is only mixmax.
  • The router checks the user's Mixmax connection and prepares the MCP endpoint.
  • The returned session.mcp.url is the MCP URL that your agent will use to access Mixmax.
  • This approach keeps things lightweight and lets the agent request Mixmax tools only when needed during the conversation.
8

Configure the agent

// Configure agent with MCP tool
const agent = new Agent({
  name: 'Assistant',
  model: 'gpt-5',
  instructions:
    'You are a helpful assistant that can access Mixmax. Help users perform Mixmax operations through natural language.',
  tools: [
    hostedMcpTool({
      serverLabel: 'tool_router',
      serverUrl: mcpUrl,
      headers: { 'x-api-key': composioApiKey },
      requireApproval: 'never',
    }),
  ],
});
What's happening:
  • We're creating an Agent instance with a name, model (gpt-5), and clear instructions about its purpose.
  • The agent's instructions tell it that it can access Mixmax and help with queries, inserts, updates, authentication, and fetching database information.
  • The tools array includes a hostedMcpTool that connects to the MCP server URL we created earlier.
  • The headers object includes the Composio API key for secure authentication with the MCP server.
  • requireApproval: 'never' means the agent can execute Mixmax operations without asking for permission each time, making interactions smoother.
9

Start chat loop and handle conversation

// 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);
});
What's happening:
  • The program prints a session URL that you visit to authorize Mixmax.
  • After authorization, the chat begins.
  • Each message you type is processed by the agent using run().
  • The responses are printed to the console.
  • Typing exit, quit, or q cleanly ends the chat.

Complete Code

Here's the complete code to get you started with Mixmax and OpenAI Agents SDK:

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: ['mixmax'],
  });
  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 Mixmax. Help users perform Mixmax 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 Mixmax MCP with OpenAI Agents SDK to build a functional AI agent that can interact with Mixmax.

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.
TOOLS

Supported Tools

Every Mixmax action and event your agent gets out of the box.

Add Contact to Group

Tool to add a contact to a contact group.

Add Email to Unsubscribe List

Tool to add an email address to the Mixmax unsubscribe list.

Add Snippet to Tag

Tool to add a snippet to a snippet tag in Mixmax.

Add Team Members

Tool to add one or more members to a Mixmax team by email.

Cancel Sequence Recipients

Tool to cancel specific recipients across all sequences.

Create Code Snippet

Tool to create a new Formatted Code enhancement in Mixmax.

Create Contact

Tool to create a new contact in Mixmax.

Create Contact Group

Tool to create a new contact group in Mixmax.

Create Contact Note

Tool to create a note for a contact.

Create insights report

Tool to create a new insights report in Mixmax.

Create Integration Enhancement

Tool to create a new enhancement integration in Mixmax.

Create Integrations Command

Tool to create a new slash command that will be visible to only your account.

Create Integrations Sidebars

Tool to create a new sidebar integration in Mixmax.

Create Link Resolver

Tool to create a new link resolver integration in Mixmax.

Create Livefeed Search

Tool to create a new saved search in the Mixmax livefeed.

Create Message

Tool to create a draft Mixmax message (email).

Create Rule

Tool to create a new Mixmax rule/webhook.

Create Rule Action

Tool to create a new action for a Mixmax rule.

Create Sequence Folder

Tool to create a new sequence folder in Mixmax.

Create Snippet Tag

Tool to create a new snippet tag (folder) in Mixmax.

Create Team

Tool to create a new team in Mixmax.

Delete Contact

Tool to delete a contact by ID.

Delete Contact Group

Tool to delete a contact group by ID.

Delete Contact Note

Tool to delete a note from a contact by its ID.

Delete Integration Enhancement

Tool to delete an integration enhancement by its ID.

Delete slash command

Tool to delete a slash command by its unique ID from Mixmax integrations.

Delete Integrations Sidebars

Tool to delete a sidebar integration by its ID.

Delete Link Resolver

Tool to permanently delete a link resolver by its ID.

Delete Rule

Tool to delete a Mixmax rule by its ID.

Delete Rule Action

Tool to delete an action from a Mixmax rule.

Delete Sequence Folder

Tool to permanently delete a sequence folder by its ID.

Delete Snippet

Tool to delete a snippet by moving it to trash.

Delete Snippet Tag

Tool to delete a snippet tag by its unique ID.

Delete Team

Tool to delete a team by its ID.

Delete Unsubscribe

Tool to remove an email address from the Mixmax unsubscribe list.

Get Code Snippet

Tool to fetch a single Formatted Code enhancement by its unique ID.

Get contact by ID

Tool to retrieve a single contact by ID from Mixmax.

Get Contact Group

Tool to retrieve a single contact group by ID.

Get Contactgroup Contacts

Tool to retrieve membership for a contact group in Mixmax.

Get Contact Notes

Tool to retrieve notes associated with a specific contact.

Get File Requests

Tool to retrieve all file requests that you've sent out through Mixmax.

Get insights report by ID

Tool to retrieve a single insights report by ID from Mixmax.

Get Integrations Commands

Tool to retrieve a list of Slash Commands that you have access to in Mixmax.

Get Integrations Enhancements

Tool to retrieve a list of enhancements that you have access to in Mixmax.

Get Link Resolver Integrations

Tool to retrieve all link resolver integrations configured in Mixmax.

Get Integrations Sidebars

Tool to retrieve a list of sidebar integrations that you have access to in Mixmax.

Get live feed activity data

Tool to retrieve live feed activity data from Mixmax.

Get Livefeed Events

Tool to retrieve events for a specific message in the live feed.

Get Meeting Invites

Tool to retrieve a paginated list of meeting invites from Mixmax.

Get Message by ID

Tool to retrieve a single message by its unique ID.

Get Messages

Tool to retrieve messages (emails) from Mixmax.

Get Polls

Tool to retrieve polls created in Mixmax along with voting information.

Get Q&A Surveys

Tool to retrieve Question & Answer surveys data from Mixmax.

Get Reports Data Table

Tool to query analytics data for messages and meetings from Mixmax reports.

Get all rules

Tool to retrieve all Mixmax rules for the authenticated user.

Get Rule by ID

Tool to fetch a single rule by its unique ID from Mixmax.

Get Salesforce account information

Tool to retrieve Salesforce account information for the authenticated user.

Get Sequence Folder by ID

Tool to retrieve a single sequence folder by its ID from Mixmax.

Get Snippet by ID

Tool to fetch a single snippet by its unique ID from Mixmax.

Get Snippet Tag

Tool to retrieve a single snippet tag (folder) by its unique ID.

Get Snippet Tags

Tool to retrieve a list of snippet tags (folders) from Mixmax.

Get Team Members

Tool to retrieve all members of a Mixmax team.

Get Teams

Tool to retrieve all teams that the authenticated user is a member of.

Get Unsubscribes

Tool to retrieve a list of unsubscribed email addresses from Mixmax.

Get Current User Preferences

Tool to retrieve preferences for the currently authenticated user.

Get Current User

Tool to retrieve information about the currently authenticated user.

Get Yes/No Questions

Tool to retrieve Yes/No questions created in Mixmax.

List Code Snippets

Tool to list all Formatted Code enhancements you've created.

List Contact Groups

Tool to retrieve a list of contact groups from Mixmax.

List Contacts

Tool to retrieve all Mixmax contacts (people you've emailed using Mixmax).

List insights reports

Tool to retrieve all insights reports from Mixmax.

List Rule Actions

Tool to list all actions for a given Mixmax rule.

List Sequence Folders

Tool to retrieve a list of all sequence folders from Mixmax.

List Sequences

Tool to retrieve a list of sequences from Mixmax.

List Snippets

Tool to list templates or snippets that you have access to (including those shared with you).

Update Rule by ID

Tool to update a rule by its unique ID in Mixmax.

Update Rule Action

Tool to update an action within a Mixmax rule.

Update Snippet by ID

Tool to update a snippet by its unique ID in Mixmax.

Post Reports Data Table

Tool to generate a table report with specified analytics data for messages, meetings, or sequences.

Query Contacts

Tool to search for matching contacts across multiple sources including Mixmax, Google Directory, and Salesforce (contacts, leads, accounts, and opportunities).

Remove Contact from Group

Tool to remove a contact from a contact group.

Remove Team Member

Tool to remove a member from a Mixmax team.

Search Sequences

Tool to search sequence recipients by email and sequenceId from Mixmax.

Send Message Draft

Tool to send a message draft by its unique ID.

Send Snippet as Email

Tool to send a snippet as an email to specified recipients.

Send Test Message

Tool to send a test Mixmax message to the authenticated user, resolving any variables.

Update Appointment Link Calendar Name

Tool to update your custom "Mixmax Calendar" vanity URL name.

Update Contact

Tool to update a specific contact by ID.

Update Contact Group

Tool to update a contact group by ID.

Update Contact Note

Tool to update a note on a contact by its ID.

Update insights report

Tool to update an existing insights report in Mixmax.

Update Message by ID

Tool to update a message by its unique ID.

Update Sequence Folder by ID

Tool to update a sequence folder by its unique ID in Mixmax.

Update Snippet Tag

Tool to update a snippet tag (folder) by its unique ID.

Update Team

Tool to update a team's information by ID.

Update Current User Preferences

Tool to update preferences for the currently authenticated user.

FRAMEWORKS

How to build Mixmax MCP Agent with another framework

Claude Agent SDK logo

Claude Agent SDK

Use Mixmax MCP with Claude Agent SDK

Claude Code logo

Claude Code

Use Mixmax MCP with Claude Code

Claude Cowork logo

Claude Cowork

Use Mixmax MCP with Claude Cowork

Codex logo

Codex

Use Mixmax MCP with Codex

OpenClaw logo

OpenClaw

Use Mixmax MCP with OpenClaw

Hermes logo

Hermes

Use Mixmax MCP with Hermes

CLI logo

CLI

Use Mixmax MCP with CLI

Google ADK logo

Google ADK

Use Mixmax MCP with Google ADK

LangChain logo

LangChain

Use Mixmax MCP with LangChain

Vercel AI SDK logo

Vercel AI SDK

Use Mixmax MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Mixmax MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Mixmax MCP with LlamaIndex

CrewAI logo

CrewAI

Use Mixmax MCP with CrewAI

FAQ

Frequently asked questions

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

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 Mixmax tools.

Yes, absolutely. You can configure which Mixmax 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.

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 Mixmax data and credentials are handled as safely as possible.

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Co-founder, Slashy

A lot of students tell us that the moment their connected tools start talking to each other inside Opennote feels almost magical. The agent just knows them, and it's immensely helped keep new users on the platform.

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Abhi Arya
Co-founder, Opennote

We chose Composio over Pipedream because it delivered depth where it mattered — niche tools and tricky edge cases other platforms simply ignored. That gave us confidence to scale without compromising.

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CEO, Zams

As a solo builder, shipping fast is life or death. The only way I can outcompete incumbents is by outmanoeuvring them. Getting bogged down managing agent auth would have been a death sentence.

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Founder, Extra Thursday

Before Composio, adding tool integrations was slow and resource-intensive. Each one could take weeks of engineering time, and maintaining them meant constantly keeping up with API changes.

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Founder & CEO, SwarmZero

With hands-on help from their founder, we integrated Gmail and Google Drive in just 30 minutes. This level of personal support and commitment is exactly what startups should strive for.

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Co-Founder, Ingram Technologies