How to integrate Mixmax MCP with Claude Agent SDK

This guide walks you through connecting Mixmax to the Claude Agent 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 Claude Agent 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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Mixmax

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Mixmax is a top sales engagement platform for Gmail, offering email tracking, scheduling, and workflow automation. Teams use it to boost productivity and streamline sales communications.

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Introduction

This guide will help you understand how to give your Claude Agent 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.

Also integrate Mixmax with

OpenAI Agents SDK Claude Code Claude Cowork Codex OpenClaw Hermes CLI Google ADK LangChain Vercel AI SDK Mastra AI LlamaIndex CrewAI

TL;DR

Here's what you'll learn:

Get and set up your Claude/Anthropic 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 Claude Agent SDK?

The Claude Agent SDK is Anthropic's official framework for building AI agents powered by Claude. It provides a streamlined interface for creating agents with MCP tool support and conversation management.

Key features include:

Native MCP Support: Built-in support for Model Context Protocol servers
Permission Modes: Control tool execution permissions
Streaming Responses: Real-time response streaming for interactive applications
Context Manager: Clean async context management for sessions

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:

Discovery: Searches for tools matching your task and returns relevant toolkits with their details.
Authentication: Checks for active connections. If missing, creates an auth config and returns a connection URL via Auth Link.
Execution: Executes the action using the authenticated connection.

Step-by-step Guide

Step by step09 STEPS

Prerequisites

Before starting, make sure you have:

Composio API Key and Claude/Anthropic API Key
Primary know-how of Claude Agents SDK
A Mixmax account
Some knowledge of Python

Getting API Keys for Claude/Anthropic and Composio

Claude/Anthropic API Key

Go to the Anthropic Console and create an API key. You'll need credits to use the models.
Keep the API key safe.

Composio API Key

Log in to the Composio dashboard.
Navigate to your API settings and generate a new API key.
Store this key securely as you'll need it for authentication.

Install dependencies

npm install @anthropic-ai/claude-agent-sdk @composio/core dotenv

Install the Composio SDK and the Claude Agents SDK.

What's happening:

@composio/core provides Composio integration for Anthropic
@anthropic-ai/claude-agent-sdk is the core agent framework
dotenv/config loads environment variables

Set up environment variables

bash

COMPOSIO_API_KEY=your_composio_api_key_here
USER_ID=your_user_id_here
ANTHROPIC_API_KEY=your_anthropic_api_key_here

Create a .env file in your project root.

What's happening:

COMPOSIO_API_KEY authenticates with Composio
USER_ID identifies the user for session management
ANTHROPIC_API_KEY authenticates with Anthropic/Claude

Import dependencies

import 'dotenv/config';
import readline from 'node:readline';
import { Composio } from '@composio/core';
import { query, type Options } from "@anthropic-ai/claude-agent-sdk";

dotenv.config();

What's happening:

We're importing all necessary libraries including the Claude Agent SDK and Composio
The dotenv.config() function loads environment variables from your .env file
This setup prepares the foundation for connecting Claude with Mixmax functionality

Create a Composio instance and Tool Router session

async function chat() {
  const { COMPOSIO_API_KEY, USER_ID } = process.env;
  if (!COMPOSIO_API_KEY || !USER_ID) {
    throw new Error('COMPOSIO_API_KEY and USER_ID required in .env');
  }

  const composio = new Composio({ apiKey: COMPOSIO_API_KEY });

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

What's happening:

The function checks for the required COMPOSIO_API_KEY environment variable
We're creating a Composio instance using our API key
The create method creates a Tool Router session for Mixmax
The returned url is the MCP server URL that your agent will use

Configure Claude Agent with MCP

const options: Options = {
  permissionMode: 'bypassPermissions',
  mcpServers: {
    composio: {
      type: 'http',
      url: mcpUrl,
      headers: { 'x-api-key': COMPOSIO_API_KEY }
    }
  },
  systemPrompt: 'You are a helpful assistant with access to Mixmax tools via Composio.',
  maxTurns: 10,
};

What's happening:

We're configuring the Claude Agent options with the MCP server URL
permissionMode: 'bypassPermissions' allows the agent to execute operations without asking for permission each time
The system prompt instructs the agent that it has access to Mixmax
maxTurns: 10 limits the conversation length to prevent excessive API usage

Create client and start chat loop

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

  console.log('\nChat started. Type "exit" to quit.\n');

  let isProcessing = false;

  async function ask(prompt: string) {
    isProcessing = true;
    rl.pause();

    process.stdout.write('Claude is thinking...');
    const stream = query({ prompt, options });

    let firstChunk = true;
    for await (const msg of stream) {
      const content = (msg as any).message?.content || (msg as any).content;
      if (Array.isArray(content)) {
        for (const block of content) {
          if (block.type === 'text' && block.text) {
            if (firstChunk) {
              process.stdout.write('\r\x1b[K');
              process.stdout.write('Claude: ');
              firstChunk = false;
            }
            process.stdout.write(block.text);
          }
        }
      }
    }
    process.stdout.write('\n\n');

    isProcessing = false;
    rl.resume();
    rl.prompt();
  }

  rl.on('line', async (line) => {
    if (isProcessing) return;

    const input = line.trim();
    if (input === 'exit') {
      rl.close();
      process.exit(0);
    }
    if (input) await ask(input);
    else rl.prompt();
  });

  await ask('What can you help me with?');
}

What's happening:

The readline interface is created to handle user input and output
The query function is used to send the user's input to the agent
The chat loop continues until the user types 'exit' or 'quit'

Run the application

try {
  await chat();
} catch (error) {
  console.error(error);
  process.exit(1);
}

What's happening:

The chat function is the entry point for the application
The try-catch block is used to handle any errors that occur

Complete Code

Here's the complete code to get you started with Mixmax and Claude Agent SDK:

import 'dotenv/config';
import readline from 'node:readline';
import { Composio } from '@composio/core';
import { query, type Options } from "@anthropic-ai/claude-agent-sdk";

async function chat() {
  const { COMPOSIO_API_KEY, USER_ID } = process.env;
  if (!COMPOSIO_API_KEY || !USER_ID) {
    throw new Error('COMPOSIO_API_KEY and USER_ID required in .env');
  }

  const composio = new Composio({ apiKey: COMPOSIO_API_KEY });
  const session = await composio.create(USER_ID, {
    toolkits: ['mixmax']
  });
  const mcp_url = session?.mcp.url;

  const options: Options = {
    permissionMode: 'bypassPermissions',
    mcpServers: {
      composio: {
        type: 'http',
        url: mcp_url,
        headers: { 'x-api-key': COMPOSIO_API_KEY }
      }
    },
    systemPrompt: 'You are a helpful assistant with access to Mixmax tools via Composio.',
    maxTurns: 10,
  };

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

  console.log('\nChat started. Type "exit" to quit.\n');

  let isProcessing = false;

  async function ask(prompt: string) {
    isProcessing = true;
    rl.pause();

    process.stdout.write('Claude is thinking...');
    const stream = query({ prompt, options });

    let firstChunk = true;
    for await (const msg of stream) {
      const content = (msg as any).message?.content || (msg as any).content;
      if (Array.isArray(content)) {
        for (const block of content) {
          if (block.type === 'text' && block.text) {
            if (firstChunk) {
              process.stdout.write('\r\x1b[K');
              process.stdout.write('Claude: ');
              firstChunk = false;
            }
            process.stdout.write(block.text);
          }
        }
      }
    }
    process.stdout.write('\n\n');

    isProcessing = false;
    rl.resume();
    rl.prompt();
  }

  rl.on('line', async (line) => {
    if (isProcessing) return;

    const input = line.trim();
    if (input === 'exit') {
      rl.close();
      process.exit(0);
    }
    if (input) await ask(input);
    else rl.prompt();
  });

  await ask('What can you help me with?');
}

try {
  await chat();
} catch (error) {
  console.error(error);
  process.exit(1);
}

Conclusion

You've successfully built a Claude Agent SDK agent that can interact with Mixmax through Composio's Tool Router.

Key features:

Native MCP support through Claude's agent framework
Streaming responses for real-time interaction
Permission bypass for smooth automated workflows

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

OpenAI Agents SDK

Use Mixmax MCP with OpenAI Agents SDK

Claude Code

Use Mixmax MCP with Claude Code

Claude Cowork

Use Mixmax MCP with Claude Cowork

Codex

Use Mixmax MCP with Codex

OpenClaw

Use Mixmax MCP with OpenClaw

Hermes

Use Mixmax MCP with Hermes

CLI

Use Mixmax MCP with CLI

Google ADK

Use Mixmax MCP with Google ADK

LangChain

Use Mixmax MCP with LangChain

Vercel AI SDK

Use Mixmax MCP with Vercel AI SDK

Mastra AI

Use Mixmax MCP with Mastra AI

LlamaIndex

Use Mixmax MCP with LlamaIndex

CrewAI

Use Mixmax MCP with CrewAI

MORE TOOLKITS

Explore Other Toolkits

Toolkit marketplace

Gmail

Oauth2

Gmail is Google's email service with powerful spam protection, search, and G Suite integration. It keeps your inbox organized and makes communication fast and reliable.

Outlook

Oauth2S2s Oauth2

Outlook is Microsoft's email and calendaring platform for unified communications and scheduling. It helps users stay organized with powerful email, contacts, and calendar management.

Google Sheets

Oauth2

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

Oauth2Api Key

Notion is a collaborative workspace for notes, docs, wikis, and tasks. It streamlines team knowledge, project tracking, and workflow customization in one place.

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. Claude Agent 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.

Start with Mixmax.It takes 30 seconds.

Managed auth, hosted MCP servers, and every Mixmax tool your agent needs.Free to start.

Start building

Customer stories

Teams ship real agents on Composio

GET STARTED FOR FREE BOOK A DEMO

Karan skipped his own birthday party to fix our critical issue. It was 10pm and he diverted his Waymo to help us instead. This really sets the bar — it shows the commitment you need when users rely on your software.

Harsha Gaddipati

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.

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.

Nirman Dave

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.

Ryan Yu

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.

Tomisin Jenrola

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.

Jerome Leclanche

Co-Founder, Ingram Technologies

How to integrate Mixmax MCP with Claude Agent SDK

Connect Mixmax without auth hassles

Introduction

Also integrate Mixmax with

TL;DR

What is Claude Agent SDK?

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

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

What is Composio SDK?

How the Composio SDK works

Step-by-step Guide

Prerequisites

Getting API Keys for Claude/Anthropic and Composio

Install dependencies

Set up environment variables

Import dependencies

Create a Composio instance and Tool Router session

Configure Claude Agent with MCP

Create client and start chat loop

Run the application

Complete Code

Conclusion

Supported Tools

How to build Mixmax MCP Agent with another framework

OpenAI Agents SDK

Claude Code

Claude Cowork

Codex

OpenClaw

Hermes

CLI

Google ADK

LangChain

Vercel AI SDK

Mastra AI

LlamaIndex

CrewAI

Explore Other Toolkits

Gmail

Outlook

Google Sheets

Notion

Frequently asked questions

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

Can I use Tool Router MCP with Claude Agent SDK?+

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

How safe is my data with Composio Tool Router?+

Start with Mixmax.It takes 30 seconds.

Teams ship real agents on Composio