How to integrate Mixmax MCP with LlamaIndex

GET STARTED FOR FREE
Framework Integration Gradient
Mixmax Logo
LlamaIndex Logo
divider

Introduction

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.

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.

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 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

pip install composio-llamaindex llama-index llama-index-llms-openai llama-index-tools-mcp python-dotenv

Create a new Python project and install the necessary dependencies:

  • composio-llamaindex: Composio's LlamaIndex integration
  • llama-index: Core LlamaIndex framework
  • llama-index-llms-openai: OpenAI LLM integration
  • llama-index-tools-mcp: MCP client for LlamaIndex
  • python-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 asyncio
import os
import dotenv

from composio import Composio
from composio_llamaindex import LlamaIndexProvider
from llama_index.core.agent.workflow import ReActAgent
from llama_index.core.workflow import Context
from llama_index.llms.openai import OpenAI
from llama_index.tools.mcp import BasicMCPClient, McpToolSpec

dotenv.load_dotenv()

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

Key imports:

  • asyncio: For async/await support
  • Composio: Main client for Composio services
  • LlamaIndexProvider: Adapts Composio tools for LlamaIndex
  • ReActAgent: LlamaIndex's reasoning and action agent
  • BasicMCPClient: Connects to MCP endpoints
  • McpToolSpec: Converts MCP tools to LlamaIndex format

Load environment variables and initialize Composio

OPENAI_API_KEY = os.getenv("OPENAI_API_KEY")
COMPOSIO_API_KEY = os.getenv("COMPOSIO_API_KEY")
COMPOSIO_USER_ID = os.getenv("COMPOSIO_USER_ID")

if not OPENAI_API_KEY:
    raise ValueError("OPENAI_API_KEY is not set in the environment")
if not COMPOSIO_API_KEY:
    raise ValueError("COMPOSIO_API_KEY is not set in the environment")
if not COMPOSIO_USER_ID:
    raise ValueError("COMPOSIO_USER_ID is not set in the environment")

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 def build_agent() -> ReActAgent:
    composio_client = Composio(
        api_key=COMPOSIO_API_KEY,
        provider=LlamaIndexProvider(),
    )

    session = composio_client.create(
        user_id=COMPOSIO_USER_ID,
        toolkits=["mixmax"],
    )

    mcp_url = session.mcp.url
    print(f"Composio MCP URL: {mcp_url}")

    mcp_client = BasicMCPClient(mcp_url, headers={"x-api-key": COMPOSIO_API_KEY})
    mcp_tool_spec = McpToolSpec(client=mcp_client)
    tools = await mcp_tool_spec.to_tool_list_async()

    llm = OpenAI(model="gpt-5")

    description = "An agent that uses Composio Tool Router MCP tools to perform Mixmax actions."
    system_prompt = """
    You are a helpful assistant connected to Composio Tool Router.
    Use the available tools to answer user queries and perform Mixmax actions.
    """
    return ReActAgent(tools=tools, llm=llm, description=description, system_prompt=system_prompt, verbose=True)

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 def chat_loop(agent: ReActAgent) -> None:
    ctx = Context(agent)
    print("Type 'quit', 'exit', or Ctrl+C to stop.")

    while True:
        try:
            user_input = input("\nYou: ").strip()
        except (KeyboardInterrupt, EOFError):
            print("\nBye!")
            break

        if not user_input or user_input.lower() in {"quit", "exit"}:
            print("Bye!")
            break

        try:
            print("Agent: ", end="", flush=True)
            handler = agent.run(user_input, ctx=ctx)

            async for event in handler.stream_events():
                # Stream token-by-token from LLM responses
                if hasattr(event, "delta") and event.delta:
                    print(event.delta, end="", flush=True)
                # Show tool calls as they happen
                elif hasattr(event, "tool_name"):
                    print(f"\n[Using tool: {event.tool_name}]", flush=True)

            # Get final response
            response = await handler
            print()  # Newline after streaming
        except KeyboardInterrupt:
            print("\n[Interrupted]")
            continue
        except Exception as e:
            print(f"\nError: {e}")

What's happening here:

  • We're creating a direct terminal interface to chat with your Mixmax database
  • The LLM's responses are streamed to the CLI for faster interaction.
  • The agent uses context to maintain conversation history
  • You can type 'quit' or 'exit' to stop the chat loop gracefully
  • Agent responses and any errors are displayed in a clear, readable format

Define the main entry point

async def main() -> None:
    agent = await build_agent()
    await chat_loop(agent)

if __name__ == "__main__":
    # Handle Ctrl+C gracefully
    signal.signal(signal.SIGINT, lambda s, f: (print("\nBye!"), exit(0)))
    try:
        asyncio.run(main())
    except KeyboardInterrupt:
        print("\nBye!")

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 asyncio
import os
import signal
import dotenv

from composio import Composio
from composio_llamaindex import LlamaIndexProvider
from llama_index.core.agent.workflow import ReActAgent
from llama_index.core.workflow import Context
from llama_index.llms.openai import OpenAI
from llama_index.tools.mcp import BasicMCPClient, McpToolSpec

dotenv.load_dotenv()

OPENAI_API_KEY = os.getenv("OPENAI_API_KEY")
COMPOSIO_API_KEY = os.getenv("COMPOSIO_API_KEY")
COMPOSIO_USER_ID = os.getenv("COMPOSIO_USER_ID")

if not OPENAI_API_KEY:
    raise ValueError("OPENAI_API_KEY is not set")
if not COMPOSIO_API_KEY:
    raise ValueError("COMPOSIO_API_KEY is not set")
if not COMPOSIO_USER_ID:
    raise ValueError("COMPOSIO_USER_ID is not set")

async def build_agent() -> ReActAgent:
    composio_client = Composio(
        api_key=COMPOSIO_API_KEY,
        provider=LlamaIndexProvider(),
    )

    session = composio_client.create(
        user_id=COMPOSIO_USER_ID,
        toolkits=["mixmax"],
    )

    mcp_url = session.mcp.url
    print(f"Composio MCP URL: {mcp_url}")

    mcp_client = BasicMCPClient(mcp_url, headers={"x-api-key": COMPOSIO_API_KEY})
    mcp_tool_spec = McpToolSpec(client=mcp_client)
    tools = await mcp_tool_spec.to_tool_list_async()

    llm = OpenAI(model="gpt-5")
    description = "An agent that uses Composio Tool Router MCP tools to perform Mixmax actions."
    system_prompt = """
    You are a helpful assistant connected to Composio Tool Router.
    Use the available tools to answer user queries and perform Mixmax actions.
    """
    return ReActAgent(
        tools=tools,
        llm=llm,
        description=description,
        system_prompt=system_prompt,
        verbose=True,
    );

async def chat_loop(agent: ReActAgent) -> None:
    ctx = Context(agent)
    print("Type 'quit', 'exit', or Ctrl+C to stop.")

    while True:
        try:
            user_input = input("\nYou: ").strip()
        except (KeyboardInterrupt, EOFError):
            print("\nBye!")
            break

        if not user_input or user_input.lower() in {"quit", "exit"}:
            print("Bye!")
            break

        try:
            print("Agent: ", end="", flush=True)
            handler = agent.run(user_input, ctx=ctx)

            async for event in handler.stream_events():
                # Stream token-by-token from LLM responses
                if hasattr(event, "delta") and event.delta:
                    print(event.delta, end="", flush=True)
                # Show tool calls as they happen
                elif hasattr(event, "tool_name"):
                    print(f"\n[Using tool: {event.tool_name}]", flush=True)

            # Get final response
            response = await handler
            print()  # Newline after streaming
        except KeyboardInterrupt:
            print("\n[Interrupted]")
            continue
        except Exception as e:
            print(f"\nError: {e}")

async def main() -> None:
    agent = await build_agent()
    await chat_loop(agent)

if __name__ == "__main__":
    # Handle Ctrl+C gracefully
    signal.signal(signal.SIGINT, lambda s, f: (print("\nBye!"), exit(0)))
    try:
        asyncio.run(main())
    except KeyboardInterrupt:
        print("\nBye!")

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.

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

Mastra AI

Mastra AI

Use Mixmax MCP with Mastra AI

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 LlamaIndex?

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.

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.

Used by agents from

Context
Letta
glean
HubSpot
Agent.ai
Altera
DataStax
Entelligence
Rolai
Context
Letta
glean
HubSpot
Agent.ai
Altera
DataStax
Entelligence
Rolai
Context
Letta
glean
HubSpot
Agent.ai
Altera
DataStax
Entelligence
Rolai

Never worry about agent reliability

We handle tool reliability, observability, and security so you never have to second-guess an agent action.

Book a call↗Get started for free