How to integrate Mixmax MCP with Mastra AI

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Introduction

This guide walks you through connecting Mixmax to Mastra AI 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 Mastra AI 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.

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 Mixmax tools
  • Connect Mastra's MCP client to the Composio generated MCP URL
  • Fetch Mixmax 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 Mixmax 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 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.

Supported Tools & Triggers

Tools
Add Contact to GroupTool to add a contact to a contact group.
Add Email to Unsubscribe ListTool to add an email address to the Mixmax unsubscribe list.
Add Snippet to TagTool to add a snippet to a snippet tag in Mixmax.
Add Team MembersTool to add one or more members to a Mixmax team by email.
Cancel Sequence RecipientsTool to cancel specific recipients across all sequences.
Create Code SnippetTool to create a new Formatted Code enhancement in Mixmax.
Create ContactTool to create a new contact in Mixmax.
Create Contact GroupTool to create a new contact group in Mixmax.
Create Contact NoteTool to create a note for a contact.
Create insights reportTool to create a new insights report in Mixmax.
Create Integration EnhancementTool to create a new enhancement integration in Mixmax.
Create Integrations CommandTool to create a new slash command that will be visible to only your account.
Create Integrations SidebarsTool to create a new sidebar integration in Mixmax.
Create Link ResolverTool to create a new link resolver integration in Mixmax.
Create Livefeed SearchTool to create a new saved search in the Mixmax livefeed.
Create MessageTool to create a draft Mixmax message (email).
Create RuleTool to create a new Mixmax rule/webhook.
Create Rule ActionTool to create a new action for a Mixmax rule.
Create Sequence FolderTool to create a new sequence folder in Mixmax.
Create Snippet TagTool to create a new snippet tag (folder) in Mixmax.
Create TeamTool to create a new team in Mixmax.
Delete ContactTool to delete a contact by ID.
Delete Contact GroupTool to delete a contact group by ID.
Delete Contact NoteTool to delete a note from a contact by its ID.
Delete Integration EnhancementTool to delete an integration enhancement by its ID.
Delete slash commandTool to delete a slash command by its unique ID from Mixmax integrations.
Delete Integrations SidebarsTool to delete a sidebar integration by its ID.
Delete Link ResolverTool to permanently delete a link resolver by its ID.
Delete RuleTool to delete a Mixmax rule by its ID.
Delete Rule ActionTool to delete an action from a Mixmax rule.
Delete Sequence FolderTool to permanently delete a sequence folder by its ID.
Delete SnippetTool to delete a snippet by moving it to trash.
Delete Snippet TagTool to delete a snippet tag by its unique ID.
Delete TeamTool to delete a team by its ID.
Delete UnsubscribeTool to remove an email address from the Mixmax unsubscribe list.
Get Code SnippetTool to fetch a single Formatted Code enhancement by its unique ID.
Get contact by IDTool to retrieve a single contact by ID from Mixmax.
Get Contact GroupTool to retrieve a single contact group by ID.
Get Contactgroup ContactsTool to retrieve membership for a contact group in Mixmax.
Get Contact NotesTool to retrieve notes associated with a specific contact.
Get File RequestsTool to retrieve all file requests that you've sent out through Mixmax.
Get insights report by IDTool to retrieve a single insights report by ID from Mixmax.
Get Integrations CommandsTool to retrieve a list of Slash Commands that you have access to in Mixmax.
Get Integrations EnhancementsTool to retrieve a list of enhancements that you have access to in Mixmax.
Get Link Resolver IntegrationsTool to retrieve all link resolver integrations configured in Mixmax.
Get Integrations SidebarsTool to retrieve a list of sidebar integrations that you have access to in Mixmax.
Get live feed activity dataTool to retrieve live feed activity data from Mixmax.
Get Livefeed EventsTool to retrieve events for a specific message in the live feed.
Get Meeting InvitesTool to retrieve a paginated list of meeting invites from Mixmax.
Get Message by IDTool to retrieve a single message by its unique ID.
Get MessagesTool to retrieve messages (emails) from Mixmax.
Get PollsTool to retrieve polls created in Mixmax along with voting information.
Get Q&A SurveysTool to retrieve Question & Answer surveys data from Mixmax.
Get Reports Data TableTool to query analytics data for messages and meetings from Mixmax reports.
Get all rulesTool to retrieve all Mixmax rules for the authenticated user.
Get Rule by IDTool to fetch a single rule by its unique ID from Mixmax.
Get Salesforce account informationTool to retrieve Salesforce account information for the authenticated user.
Get Sequence Folder by IDTool to retrieve a single sequence folder by its ID from Mixmax.
Get Snippet by IDTool to fetch a single snippet by its unique ID from Mixmax.
Get Snippet TagTool to retrieve a single snippet tag (folder) by its unique ID.
Get Snippet TagsTool to retrieve a list of snippet tags (folders) from Mixmax.
Get Team MembersTool to retrieve all members of a Mixmax team.
Get TeamsTool to retrieve all teams that the authenticated user is a member of.
Get UnsubscribesTool to retrieve a list of unsubscribed email addresses from Mixmax.
Get Current User PreferencesTool to retrieve preferences for the currently authenticated user.
Get Current UserTool to retrieve information about the currently authenticated user.
Get Yes/No QuestionsTool to retrieve Yes/No questions created in Mixmax.
List Code SnippetsTool to list all Formatted Code enhancements you've created.
List Contact GroupsTool to retrieve a list of contact groups from Mixmax.
List ContactsTool to retrieve all Mixmax contacts (people you've emailed using Mixmax).
List insights reportsTool to retrieve all insights reports from Mixmax.
List Rule ActionsTool to list all actions for a given Mixmax rule.
List Sequence FoldersTool to retrieve a list of all sequence folders from Mixmax.
List SequencesTool to retrieve a list of sequences from Mixmax.
List SnippetsTool to list templates or snippets that you have access to (including those shared with you).
Update Rule by IDTool to update a rule by its unique ID in Mixmax.
Update Rule ActionTool to update an action within a Mixmax rule.
Update Snippet by IDTool to update a snippet by its unique ID in Mixmax.
Post Reports Data TableTool to generate a table report with specified analytics data for messages, meetings, or sequences.
Query ContactsTool to search for matching contacts across multiple sources including Mixmax, Google Directory, and Salesforce (contacts, leads, accounts, and opportunities).
Remove Contact from GroupTool to remove a contact from a contact group.
Remove Team MemberTool to remove a member from a Mixmax team.
Search SequencesTool to search sequence recipients by email and sequenceId from Mixmax.
Send Message DraftTool to send a message draft by its unique ID.
Send Snippet as EmailTool to send a snippet as an email to specified recipients.
Send Test MessageTool to send a test Mixmax message to the authenticated user, resolving any variables.
Update Appointment Link Calendar NameTool to update your custom "Mixmax Calendar" vanity URL name.
Update ContactTool to update a specific contact by ID.
Update Contact GroupTool to update a contact group by ID.
Update Contact NoteTool to update a note on a contact by its ID.
Update insights reportTool to update an existing insights report in Mixmax.
Update Message by IDTool to update a message by its unique ID.
Update Sequence Folder by IDTool to update a sequence folder by its unique ID in Mixmax.
Update Snippet TagTool to update a snippet tag (folder) by its unique ID.
Update TeamTool to update a team's information by ID.
Update Current User PreferencesTool to update preferences for the currently authenticated user.

What is the Composio tool router, and how does it fit here?

What is Tool Router?

Composio's Tool Router 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 Tool Router

The tool router generates a secure MCP URL that your agents can access to perform actions.

How the Tool Router works

The Tool Router 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 Mixmax 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 Mixmax

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

  const composioMCPUrl = session.mcp.url;
  console.log("Mixmax MCP URL:", composioMCPUrl);
What's happening:
  • create spins up a short-lived MCP HTTP endpoint for this user
  • The toolkits array contains "mixmax" for Mixmax 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 Mixmax toolkit

Create the Mastra agent

typescript
const agent = new Agent({
    name: "mixmax-mastra-agent",
    instructions: "You are an AI agent with Mixmax 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: {
        mixmax: 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 Mixmax 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 Mixmax 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: ["mixmax"],
  });

  const composioMCPUrl = session.mcp.url;

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

  const composioTools = await mcpClient.getTools();

  const agent = new Agent({
    name: "mixmax-mastra-agent",
    instructions: "You are an AI agent with Mixmax 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: { mixmax: 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 Mixmax 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

How to build Mixmax MCP Agent with another framework

OpenAI Agents SDK

OpenAI Agents SDK

Use Mixmax MCP with OpenAI Agents SDK

Claude Agent SDK

Claude Agent SDK

Use Mixmax MCP with Claude Agent SDK

Google ADK

Google ADK

Use Mixmax MCP with Google ADK

LangChain

LangChain

Use Mixmax MCP with LangChain

Vercel AI SDK

Vercel AI SDK

Use Mixmax MCP with Vercel AI SDK

LlamaIndex

LlamaIndex

Use Mixmax MCP with LlamaIndex

CrewAI

CrewAI

Use Mixmax MCP with CrewAI

Claude Code

Claude Code

Use Mixmax MCP with Claude Code

Codex

Codex

Use Mixmax MCP with Codex

FAQ

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

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.

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 Mixmax tools.

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

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.

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 Mixmax data and credentials are handled as safely as possible.

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