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How to integrate Zoho mail MCP with LangChain

Connect LangChain to Zoho mail MCP. Send a follow-up email to yesterday's meeting attendees, list unread emails from your manager, and more using natural language, with authentication handled for you.

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Zoho mail

Oauth2

Zoho Mail is a secure and ad-free email hosting platform with collaboration features. It helps businesses communicate efficiently while maintaining privacy and administrative control.

45 Tools

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Introduction

This guide walks you through connecting Zoho mail to LangChain using the Composio tool router. By the end, you'll have a working Zoho mail agent that can send and reply to emails, search messages, organize folders and labels, download attachments, and create tasks through natural language commands.

This guide will help you understand how to give your LangChain agent real control over a Zoho mail account through Composio's Zoho mail 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:

Get and set up your OpenAI and Composio API keys
Connect your Zoho mail project to Composio
Create a Tool Router MCP session for Zoho mail
Initialize an MCP client and retrieve Zoho mail tools
Build a LangChain agent that can interact with Zoho mail
Set up an interactive chat interface for testing

What is LangChain?

LangChain is a framework for developing applications powered by language models. It provides tools and abstractions for building agents that can reason, use tools, and maintain conversation context.

Key features include:

Agent Framework: Build agents that can use tools and make decisions
MCP Integration: Connect to external services through Model Context Protocol adapters
Memory Management: Maintain conversation history across interactions
Multi-Provider Support: Works with OpenAI, Anthropic, and other LLM providers

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

The Zoho mail MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Zoho mail account. It provides structured and secure access to your mailbox, so your agent can perform actions like searching emails, sending messages, managing folders, organizing conversations, and handling attachments on your behalf.

Smart email search and filtering: Ask your agent to find emails based on sender, subject, keywords, or date ranges for quick information retrieval.
Automated composing and sending: Let your agent draft and send new emails, reply to existing threads, or create message templates to streamline communication.
Folder and label organization: Have your agent organize your inbox by moving messages to folders, applying tags, or archiving threads for a clutter-free workspace.
Attachment management: Retrieve, download, or send attachments through your agent—making file sharing and access seamless within your email workflow.
Bulk message actions: Instruct your agent to mark emails as read or unread, star important messages, or clean up your inbox by deleting or archiving in bulk.

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 starting this tutorial, make sure you have:

Python 3.10 or higher installed on your system
A Composio account with an API key
An OpenAI API key
Basic familiarity with Python and async programming

Getting API Keys for OpenAI and Composio

OpenAI API Key

Go to the OpenAI dashboard and create an API key. You'll need credits to use the models, or you can connect to another model provider.
Keep the API key safe.

Composio API Key

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 @composio/langchain @langchain/core @langchain/openai @langchain/mcp-adapters dotenv

Install the required packages for LangChain with MCP support.

What's happening:

@composio/langchain provides Composio integration for LangChain
@langchain/mcp-adapters enables MCP client connections
@langchain/core is the core agent framework
dotenv/config loads environment variables

Set up environment variables

bash

COMPOSIO_API_KEY=your_composio_api_key_here
COMPOSIO_USER_ID=your_composio_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's API
COMPOSIO_USER_ID identifies the user for session management
OPENAI_API_KEY enables access to OpenAI's language models

Import dependencies

import { Composio } from '@composio/core';
import { LangchainProvider } from '@composio/langchain';
import { MultiServerMCPClient } from "@langchain/mcp-adapters";
import { createAgent } from "langchain";
import * as readline from 'readline';
import 'dotenv/config';

dotenv.config();

What's happening:

We're importing LangChain's MCP adapter and Composio SDK
The dotenv/config import loads environment variables from your .env file
This setup prepares the foundation for connecting LangChain with Zoho mail functionality through MCP

Initialize Composio client

const composioApiKey = process.env.COMPOSIO_API_KEY;
const userId = process.env.COMPOSIO_USER_ID;

if (!composioApiKey) throw new Error('COMPOSIO_API_KEY is not set');
if (!userId) throw new Error('COMPOSIO_USER_ID is not set');

async function main() {
    const composio = new Composio({
        apiKey: composioApiKey as string,
        provider: new LangchainProvider()
    });

What's happening:

We're loading the COMPOSIO_API_KEY from environment variables and validating it exists
Creating a Composio instance that will manage our connection to Zoho mail tools
Validating that COMPOSIO_USER_ID is also set before proceeding

Create a Tool Router session

const session = await composio.create(
    userId as string,
    {
        toolkits: ['zoho_mail']
    }
);

const url = session.mcp.url;

What's happening:

We're creating a Tool Router session that gives your agent access to Zoho mail tools
The create method takes the user ID and specifies which toolkits should be available
The returned session.mcp.url is the MCP server URL that your agent will use
This approach allows the agent to dynamically load and use Zoho mail tools as needed

Configure the agent with the MCP URL

const client = new MultiServerMCPClient({
    "zoho_mail-agent": {
        transport: "http",
        url: url,
        headers: {
            "x-api-key": process.env.COMPOSIO_API_KEY
        }
    }
});

const tools = await client.getTools();

const agent = createAgent({ model: "gpt-5", tools });

What's happening:

We're creating a MultiServerMCPClient that connects to our Zoho mail MCP server via HTTP
The client is configured with a name and the URL from our Tool Router session
getTools() retrieves all available Zoho mail tools that the agent can use
We're creating a LangChain agent using the GPT-5 model

Set up interactive chat interface

let conversationHistory: any[] = [];

console.log("Chat started! Type 'exit' or 'quit' to end the conversation.\n");
console.log("Ask any Zoho mail related question or task to the agent.\n");

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

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;
    }

    conversationHistory.push({ role: "user", content: trimmedInput });
    console.log("\nAgent is thinking...\n");

    const response = await agent.invoke({ messages: conversationHistory });
    conversationHistory = response.messages;

    const finalResponse = response.messages[response.messages.length - 1]?.content;
    console.log(`Agent: ${finalResponse}\n`);
        
        rl.prompt();
    });

    rl.on('close', () => {
        console.log('\n👋 Session ended.');
        process.exit(0);
    });

What's happening:

We initialize an empty conversationHistory list to maintain context across interactions
A readline interface is used to continuously accept user input from the command line
When a user types a message, it's added to the conversation history and sent to the agent
The agent processes the request using the invoke() method with the full conversation history
Users can type 'exit', 'quit', or 'bye' to end the chat session gracefully

Run the application

main().catch((err) => {
    console.error('Fatal error:', err);
    process.exit(1);
});

What's happening:

We call the main() function to start the application

Complete Code

Here's the complete code to get you started with Zoho mail and LangChain:

import { Composio } from '@composio/core';
import { LangchainProvider } from '@composio/langchain';
import { MultiServerMCPClient } from "@langchain/mcp-adapters";  
import { createAgent } from "langchain";
import * as readline from 'readline';
import 'dotenv/config';

const composioApiKey = process.env.COMPOSIO_API_KEY;
const userId = process.env.COMPOSIO_USER_ID;

if (!composioApiKey) throw new Error('COMPOSIO_API_KEY is not set');
if (!userId) throw new Error('COMPOSIO_USER_ID is not set');

async function main() {
    const composio = new Composio({
        apiKey: composioApiKey as string,
        provider: new LangchainProvider()
    });

    const session = await composio.create(
        userId as string,
        {
            toolkits: ['zoho_mail']
        }
    );

    const url = session.mcp.url;
    
    const client = new MultiServerMCPClient({
        "zoho_mail-agent": {
            transport: "http",
            url: url,
            headers: {
                "x-api-key": process.env.COMPOSIO_API_KEY
            }
        }
    });
    
    const tools = await client.getTools();
  
    const agent = createAgent({ model: "gpt-5", tools });
    
    let conversationHistory: any[] = [];
    
    console.log("Chat started! Type 'exit' or 'quit' to end the conversation.\n");
    console.log("Ask any Zoho mail related question or task to the agent.\n");
    
    const rl = readline.createInterface({
        input: process.stdin,
        output: process.stdout,
        prompt: 'You: '
    });

    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;
        }
        
        conversationHistory.push({ role: "user", content: trimmedInput });
        console.log("\nAgent is thinking...\n");
        
        const response = await agent.invoke({ messages: conversationHistory });
        conversationHistory = response.messages;
        
        const finalResponse = response.messages[response.messages.length - 1]?.content;
        console.log(`Agent: ${finalResponse}\n`);
        
        rl.prompt();
    });

    rl.on('close', () => {
        console.log('\nSession ended.');
        process.exit(0);
    });
}

main().catch((err) => {
    console.error('Fatal error:', err);
    process.exit(1);
});

Conclusion

You've successfully built a LangChain agent that can interact with Zoho mail through Composio's Tool Router.

Key features of this implementation:

Dynamic tool loading through Composio's Tool Router
Conversation history maintenance for context-aware responses
Async Python provides clean, efficient execution of agent workflows

You can extend this further by adding error handling, implementing specific business logic, or integrating additional Composio toolkits to create multi-app workflows.

TOOLS

Supported Tools

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

Create Signature

Create a signature, optionally assign it to users, and return it.

Get Signatures

List all connected-user signatures or retrieve one signature by ID.

List Zoho Mail Accounts

Retrieves all Zoho Mail accounts associated with the authenticated user.

Update Account Display Name

Update the display name of a Zoho Mail account owned by the user.

Delete Label

Delete a label and remove it from associated Zoho Mail messages.

Create Folder

Create a folder in a Zoho Mail account and return its folder record.

Delete Folder

Delete a folder from a Zoho Mail account.

Get Folder

Retrieve one Zoho Mail folder by account and folder ID.

List Folders

List every folder in a Zoho Mail account.

Update Folder

Rename or move a Zoho Mail folder, or enable or disable its IMAP visibility, and return its observed state from a follow-up read.

Delete Groups in Bulk

Delete multiple groups in a single API call.

Delete Group

Tool to delete a specific mail group by its zgid.

Get Organization Group

Retrieve one Zoho Mail organization group, including members and settings.

List Moderated Messages

List messages held for moderation in one Zoho Mail organization group.

Moderate Messages

Release held group messages for delivery or permanently reject them.

Create Label

Create a label in a Zoho Mail account and return its identifiers.

List Labels

List every label configured in a Zoho Mail account.

List Bookmarks

Tool to retrieve all personal bookmarks from a Zoho Mail account.

List Organization Accounts

List one offset-paginated page of accounts managed by a Zoho organization.

List Organization Domains

List mail domains configured for a Zoho Mail organization.

Manage Domain Addresses

Add or permanently remove domain aliases, catch-all delivery, and notification addresses.

Manage Domain DKIM

Add, verify, regenerate, default, or delete a domain DKIM selector.

Manage Domain Hosting

Set a primary domain or enable/disable mail hosting and subdomain stripping.

Create Email Draft

Tool to create and save an email draft in Zoho Mail without sending it.

Delete Email

Move one Zoho Mail email to trash or permanently delete it.

Download Attachment

Download one attachment from a Zoho Mail message as a file.

Get Attachment Info

Get normal and optional inline attachment metadata for one message.

Get Message Content

Tool to retrieve the full content/body of a specific Zoho Mail email.

Get Message Headers

Get one email's internet message headers without flattening repeated values.

Get Message Metadata

Retrieve one email's complete metadata record by account, folder, and message ID.

List Emails

Tool to retrieve a list of emails from a Zoho Mail account folder.

Reply to Email

Send or schedule a reply while preserving the original message thread.

Send Email

Send an email immediately or schedule it for later delivery.

Update Messages

Batch-update message or thread read, folder, flag, label, archive, or spam state.

Get Organization User Storage Details

Tool to retrieve storage details for a specific user in the organization.

Update Organization Spam Process Type

Tool to update organization spam processing type.

Update User Storage

Updates a user's storage allocation within a Zoho Mail organization.

Search Messages

Tool to search emails in a Zoho Mail account using Zoho's searchKey syntax.

Create Group Task

Create a task in a Zoho Mail group.

Create Personal Task

Create a personal task for the connected Zoho Mail user.

List Personal Tasks

List one offset-paginated page of personal tasks for the connected Zoho Mail user.

Update Group Task

Update one documented field on a task in a Zoho Mail group.

Update Group Settings

Tool to update group settings.

Update Organization Account

Enable or disable an external account, or update incoming, outgoing, IMAP, POP, or ActiveSync status for an organization-managed mailbox.

Verify Domain Records

Verify domain ownership, SPF, or MX DNS records for a Zoho Mail domain.

FRAMEWORKS

How to build Zoho mail MCP Agent with another framework

Claude Code

Use Zoho mail MCP with Claude Code

Cursor

Use Zoho mail MCP with Cursor

ChatGPT

Use Zoho mail MCP with ChatGPT

Claude Cowork

Use Zoho mail MCP with Claude Cowork

Antigravity

Use Zoho mail MCP with Antigravity

OpenAI Agents SDK

Use Zoho mail MCP with OpenAI Agents SDK

Claude Agent SDK

Use Zoho mail MCP with Claude Agent SDK

Codex

Use Zoho mail MCP with Codex

Grok Build

Use Zoho mail MCP with Grok Build

VS Code

Use Zoho mail MCP with VS Code

OpenCode

Use Zoho mail MCP with OpenCode

OpenClaw

Use Zoho mail MCP with OpenClaw

Hermes

Use Zoho mail MCP with Hermes

Atomic Agent

Use Zoho mail MCP with Atomic Agent

Pi

Use Zoho mail MCP with Pi

DeepSeek Harness

Use Zoho mail MCP with DeepSeek Harness

Google ADK

Use Zoho mail MCP with Google ADK

Vercel AI SDK

Use Zoho mail MCP with Vercel AI SDK

Mastra AI

Use Zoho mail MCP with Mastra AI

LlamaIndex

Use Zoho mail MCP with LlamaIndex

CrewAI

Use Zoho mail MCP with CrewAI

Pydantic AI

Use Zoho mail MCP with Pydantic AI

AutoGen

Use Zoho mail MCP with AutoGen

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.

Slack

Oauth2

Slack is a channel-based messaging platform for teams and organizations. It helps people collaborate in real time, share files, and connect all their tools in one place.

Gong

BasicOauth2

Gong is a platform for video meetings, call recording, and team collaboration. It helps teams capture conversations, analyze calls, and turn insights into action.

FAQ

Frequently asked questions

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

Yes, you can. LangChain 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 Zoho mail tools.

Yes, absolutely. You can configure which Zoho mail 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 Zoho mail data and credentials are handled as safely as possible.

Start with Zoho mail.It takes 30 seconds.

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

Start building

How to integrate Zoho mail MCP with LangChain

Connect Zoho mail without auth hassles

Introduction

Also integrate Zoho mail with

TL;DR

What is LangChain?

What is the Zoho mail 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 OpenAI and Composio

Install dependencies

Set up environment variables

Import dependencies

Initialize Composio client

Create a Tool Router session

Configure the agent with the MCP URL

Set up interactive chat interface

Run the application

Complete Code

Conclusion

Supported Tools

How to build Zoho mail MCP Agent with another framework

Claude Code

Cursor

ChatGPT

Claude Cowork

Antigravity

OpenAI Agents SDK

Claude Agent SDK

Codex

Grok Build

VS Code

OpenCode

OpenClaw

Hermes

Atomic Agent

Pi

DeepSeek Harness

Google ADK

Vercel AI SDK

Mastra AI

LlamaIndex

CrewAI

Pydantic AI

AutoGen

Explore Other Toolkits

Gmail

Outlook

Slack

Gong

Frequently asked questions

What are the differences in Tool Router MCP and Zoho mail MCP?+

Can I use Tool Router MCP with LangChain?+

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

How safe is my data with Composio Tool Router?+

Start with Zoho mail.It takes 30 seconds.