How to integrate Mixmax MCP with LlamaIndex

This guide walks you through connecting Mixmax to LlamaIndex 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 LlamaIndex 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 will help you understand how to give your LlamaIndex 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 Agent SDK Claude Code Claude Cowork Codex OpenClaw Hermes CLI Google ADK LangChain Vercel AI SDK Mastra AI CrewAI

TL;DR

Here's what you'll learn:

Set your OpenAI and Composio API keys
Install LlamaIndex and Composio packages
Create a Composio Tool Router session for Mixmax
Connect LlamaIndex to the Mixmax MCP server
Build a Mixmax-powered agent using LlamaIndex
Interact with Mixmax through natural language

What is LlamaIndex?

LlamaIndex is a data framework for building LLM applications. It provides tools for connecting LLMs to external data sources and services through agents and tools.

Key features include:

ReAct Agent: Reasoning and acting pattern for tool-using agents
MCP Tools: Native support for Model Context Protocol
Context Management: Maintain conversation context across interactions
Async Support: Built for async/await patterns

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 step10 STEPS

Prerequisites

Before you begin, make sure you have:

Python 3.8/Node 16 or higher installed
A Composio account with the API key
An OpenAI API key
A Mixmax account and project
Basic familiarity with async Python/Typescript

Getting API Keys for OpenAI, Composio, and Mixmax

OpenAI API key (OPENAI_API_KEY)

Go to the OpenAI dashboard
Create an API key if you don't have one
Assign it to OPENAI_API_KEY in .env

Composio API key and user ID

Log into the Composio dashboard
Copy your API key from Settings
- Use this as COMPOSIO_API_KEY
Pick a stable user identifier (email or ID)
- Use this as COMPOSIO_USER_ID

Installing dependencies

npm install @composio/llamaindex @llamaindex/openai @llamaindex/tools @llamaindex/workflow dotenv

Create a new Typescript project and install the necessary dependencies:

@composio/llamaindex: Composio's LlamaIndex integration
@llamaindex/openai: OpenAI LLM integration
@llamaindex/tools: MCP client for LlamaIndex
@llamaindex/workflow: Workflow framework for LlamaIndex
dotenv: Environment variable management

Set environment variables

bash

OPENAI_API_KEY=your-openai-api-key
COMPOSIO_API_KEY=your-composio-api-key
COMPOSIO_USER_ID=your-user-id

Create a .env file in your project root:

These credentials will be used to:

Authenticate with OpenAI's GPT-5 model
Connect to Composio's Tool Router
Identify your Composio user session for Mixmax access

Import modules

import "dotenv/config";
import readline from "node:readline/promises";
import { stdin as input, stdout as output } from "node:process";

import { Composio } from "@composio/core";

import { mcp } from "@llamaindex/tools";
import { agent as createAgent } from "@llamaindex/workflow";
import { openai } from "@llamaindex/openai";

dotenv.config();

Create a new file called mixmax_llamaindex_agent.ts and import the required modules:

Key imports:

dotenv.config loads .env at runtime
readline gives us a simple CLI chat loop
Composio is the main Composio SDK client
mcp connects to an MCP endpoint
createAgent builds a LlamaIndex agent
openai configures the LLM backend

Load environment variables and initialize Composio

const OPENAI_API_KEY = process.env.OPENAI_API_KEY;
const COMPOSIO_API_KEY = process.env.COMPOSIO_API_KEY;
const COMPOSIO_USER_ID = process.env.COMPOSIO_USER_ID;

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

What's happening:

This ensures missing credentials cause early, clear errors before the agent attempts to initialise.

Create a Tool Router session and build the agent function

async function buildAgent() {

  console.log(`Initializing Composio client...${COMPOSIO_USER_ID!}...`);
  console.log(`COMPOSIO_USER_ID: ${COMPOSIO_USER_ID!}...`);

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

  const session = await composio.create(
    COMPOSIO_USER_ID!,
    {
      toolkits: ["mixmax"],
    },
  );

  const mcpUrl = session.mcp.url;
  console.log(`Composio Tool Router MCP URL: ${mcpUrl}`);

  const server = mcp({
    url: mcpUrl,
    clientName: "composio_tool_router_with_llamaindex",
    requestInit: {
      headers: {
        "x-api-key": COMPOSIO_API_KEY!,
      },
    },
    // verbose: true,
  });

  const tools = await server.tools();

  const llm = openai({ apiKey: OPENAI_API_KEY, model: "gpt-5" });

  const agent = createAgent({
    name: "composio_tool_router_with_llamaindex",
        description : "An agent that uses Composio Tool Router MCP tools to perform actions.",
    systemPrompt:
      "You are a helpful assistant connected to Composio Tool Router."+
"Use the available tools to answer user queries and perform Mixmax actions." ,
    llm,
    tools,
  });

  return agent;
}

What's happening here:

We create a Composio client using your API key and configure it with the LlamaIndex provider
We then create a tool router MCP session for your user, specifying the toolkits we want to use (in this case, mixmax)
The session returns an MCP HTTP endpoint URL that acts as a gateway to all your configured tools
LlamaIndex will connect to this endpoint to dynamically discover and use the available Mixmax tools.
The MCP tools are mapped to LlamaIndex-compatible tools and plug them into the Agent.

Create an interactive chat loop

async function chatLoop(agent: ReturnType<typeof createAgent>) {
  const rl = readline.createInterface({ input, output });

  console.log("Type 'quit' or 'exit' to stop.");

  while (true) {
    let userInput: string;

    try {
      userInput = (await rl.question("\nYou: ")).trim();
    } catch {
      console.log("\nAgent: Bye!");
      break;
    }

    if (!userInput) {
      continue;
    }

    const lower = userInput.toLowerCase();
    if (lower === "quit" || lower === "exit") {
      console.log("Agent: Bye!");
      break;
    }

    try {
      process.stdout.write("Agent: ");

      const stream = agent.runStream(userInput);
      let finalResult: any = null;

      for await (const event of stream) {
        // The event.data contains the streamed content
        const data: any = event.data;

        // Check for streaming delta content
        if (data?.delta) {
          process.stdout.write(data.delta);
        }

        // Store final result for fallback
        if (data?.result || data?.message) {
          finalResult = data;
        }
      }

      // If no streaming happened, show the final result
      if (finalResult) {
        const answer =
          finalResult.result ??
          finalResult.message?.content ??
          finalResult.message ??
          "";
        if (answer && typeof answer === "string" && !answer.includes("[object")) {
          process.stdout.write(answer);
        }
      }

      console.log(); // New line after streaming completes
    } catch (err: any) {
      console.error("\nAgent error:", err?.message ?? err);
    }
  }

  rl.close();
}

What's happening:

We're creating a direct terminal interface to chat with Mixmax
The LLM's responses are streamed to the CLI for faster interaction.
The agent uses context to maintain conversation history
The agent processes the request, selects appropriate Mixmax tools, and returns a result
We extract the answer from the result data structure and display it to the user
You can type 'quit' or 'exit' to stop the chat loop gracefully
Agent responses and any errors are streamed in a clear, readable format

Define the main entry point

async function main() {
  try {
    const agent = await buildAgent();
    await chatLoop(agent);
  } catch (err) {
    console.error("Failed to start agent:", err);
    process.exit(1);
  }
}

main();

What's happening here:

We're orchestrating the entire application flow
The agent gets built with proper error handling
Then we kick off the interactive chat loop so you can start talking to Mixmax

Run the agent

npx ts-node llamaindex-agent.ts

When prompted, authenticate and authorise your agent with Mixmax, then start asking questions.

Complete Code

Here's the complete code to get you started with Mixmax and LlamaIndex:

import "dotenv/config";
import readline from "node:readline/promises";
import { stdin as input, stdout as output } from "node:process";

import { Composio } from "@composio/core";
import { LlamaindexProvider } from "@composio/llamaindex";

import { mcp } from "@llamaindex/tools";
import { agent as createAgent } from "@llamaindex/workflow";
import { openai } from "@llamaindex/openai";

dotenv.config();

const OPENAI_API_KEY = process.env.OPENAI_API_KEY;
const COMPOSIO_API_KEY = process.env.COMPOSIO_API_KEY;
const COMPOSIO_USER_ID = process.env.COMPOSIO_USER_ID;

if (!OPENAI_API_KEY) {
    throw new Error("OPENAI_API_KEY is not set in the environment");
  }
if (!COMPOSIO_API_KEY) {
    throw new Error("COMPOSIO_API_KEY is not set in the environment");
  }
if (!COMPOSIO_USER_ID) {
    throw new Error("COMPOSIO_USER_ID is not set in the environment");
  }

async function buildAgent() {

  console.log(`Initializing Composio client...${COMPOSIO_USER_ID!}...`);
  console.log(`COMPOSIO_USER_ID: ${COMPOSIO_USER_ID!}...`);

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

  const session = await composio.create(
    COMPOSIO_USER_ID!,
    {
      toolkits: ["mixmax"],
    },
  );

  const mcpUrl = session.mcp.url;
  console.log(`Composio Tool Router MCP URL: ${mcpUrl}`);

  const server = mcp({
    url: mcpUrl,
    clientName: "composio_tool_router_with_llamaindex",
    requestInit: {
      headers: {
        "x-api-key": COMPOSIO_API_KEY!,
      },
    },
    // verbose: true,
  });

  const tools = await server.tools();

  const llm = openai({ apiKey: OPENAI_API_KEY, model: "gpt-5" });

  const agent = createAgent({
    name: "composio_tool_router_with_llamaindex",
    description:
      "An agent that uses Composio Tool Router MCP tools to perform actions.",
    systemPrompt:
      "You are a helpful assistant connected to Composio Tool Router."+
"Use the available tools to answer user queries and perform Mixmax actions." ,
    llm,
    tools,
  });

  return agent;
}

async function chatLoop(agent: ReturnType<typeof createAgent>) {
  const rl = readline.createInterface({ input, output });

  console.log("Type 'quit' or 'exit' to stop.");

  while (true) {
    let userInput: string;

    try {
      userInput = (await rl.question("\nYou: ")).trim();
    } catch {
      console.log("\nAgent: Bye!");
      break;
    }

    if (!userInput) {
      continue;
    }

    const lower = userInput.toLowerCase();
    if (lower === "quit" || lower === "exit") {
      console.log("Agent: Bye!");
      break;
    }

    try {
      process.stdout.write("Agent: ");

      const stream = agent.runStream(userInput);
      let finalResult: any = null;

      for await (const event of stream) {
        // The event.data contains the streamed content
        const data: any = event.data;

        // Check for streaming delta content
        if (data?.delta) {
          process.stdout.write(data.delta);
        }

        // Store final result for fallback
        if (data?.result || data?.message) {
          finalResult = data;
        }
      }

      // If no streaming happened, show the final result
      if (finalResult) {
        const answer =
          finalResult.result ??
          finalResult.message?.content ??
          finalResult.message ??
          "";
        if (answer && typeof answer === "string" && !answer.includes("[object")) {
          process.stdout.write(answer);
        }
      }

      console.log(); // New line after streaming completes
    } catch (err: any) {
      console.error("\nAgent error:", err?.message ?? err);
    }
  }

  rl.close();
}

async function main() {
  try {
    const agent = await buildAgent();
    await chatLoop(agent);
  } catch (err: any) {
    console.error("Failed to start agent:", err?.message ?? err);
    process.exit(1);
  }
}

main();

Conclusion

You've successfully connected Mixmax to LlamaIndex through Composio's Tool Router MCP layer. Key takeaways:

Tool Router dynamically exposes Mixmax tools through an MCP endpoint
LlamaIndex's ReActAgent handles reasoning and orchestration; Composio handles integrations
The agent becomes more capable without increasing prompt size
Async Python provides clean, efficient execution of agent workflows

You can easily extend this to other toolkits like Gmail, Notion, Stripe, GitHub, and more by adding them to the toolkits parameter.

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 Agent SDK

Use Mixmax MCP with Claude Agent 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

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. LlamaIndex 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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