How to integrate Whatsapp MCP with Pydantic AI

Connect Pydantic AI to Whatsapp MCP. Send contact card to new lead, get business profile details for support, and more using natural language, with authentication handled for you.

Get started for free Get a demo

Oauth2Api Key

WhatsApp is a business messaging platform for secure, automated customer communication. It streamlines chat workflows and customer outreach using the WhatsApp Business API.

58 Tools1 Triggers

Managed auth

Connect Whatsapp without auth hassles

We manage OAuth, API keys, token refresh, and scopes — you just build.

Book a call

Explore the MCP Gateway

Introduction

This guide walks you through connecting Whatsapp to Pydantic AI using the Composio tool router. By the end, you'll have a working Whatsapp agent that can send contact card to new lead, get business profile details for support, list all approved message templates through natural language commands.

This guide will help you understand how to give your Pydantic AI agent real control over a Whatsapp account through Composio's Whatsapp 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:

How to set up your Composio API key and User ID
How to create a Composio Tool Router session for Whatsapp
How to attach an MCP Server to a Pydantic AI agent
How to stream responses and maintain chat history
How to build a simple REPL-style chat interface to test your Whatsapp workflows

What is Pydantic AI?

Pydantic AI is a Python framework for building AI agents with strong typing and validation. It leverages Pydantic's data validation capabilities to create robust, type-safe AI applications.

Key features include:

Type Safety: Built on Pydantic for automatic data validation
MCP Support: Native support for Model Context Protocol servers
Streaming: Built-in support for streaming responses
Async First: Designed for async/await patterns

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

The WhatsApp MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your WhatsApp account. It provides structured and secure access to your WhatsApp Business account settings, profiles, templates, flows, and phone configuration, so your agent can manage business details, register phone numbers, maintain templates, update flows, and review account settings on your behalf.

Business profile management: Have your agent update your business description, contact information, and other WhatsApp Business profile settings.
Phone number administration: Direct your agent to register or deregister a WhatsApp Business phone number and set its two-step verification PIN.
Message template management: Let the agent browse the template library and create or update templates for your WhatsApp Business account.
Flow and commerce configuration: Instruct your agent to review Flow assets, update Flow configurations, and check commerce settings for your business phone number.
Account oversight and access: Have your agent review owned or shared business accounts, inspect compliance and encryption details, manage assigned user access, and subscribe your application to account notifications.

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:

Python 3.9 or higher
A Composio account with an active 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

bash

pip install composio pydantic-ai python-dotenv

Install the required libraries.

What's happening:

composio connects your agent to external SaaS tools like Whatsapp
pydantic-ai lets you create structured AI agents with tool support
python-dotenv loads your environment variables securely from a .env file

Set up environment variables

bash

COMPOSIO_API_KEY=your_composio_api_key_here
USER_ID=your_user_id_here
OPENAI_API_KEY=your_openai_api_key

Create a .env file in your project root.

What's happening:

COMPOSIO_API_KEY authenticates your agent to Composio's API
USER_ID associates your session with your account for secure tool access
OPENAI_API_KEY to access OpenAI LLMs

Import dependencies

python

import asyncio
import os
from dotenv import load_dotenv
from composio import Composio
from pydantic_ai import Agent
from pydantic_ai.mcp import MCPServerStreamableHTTP

load_dotenv()

What's happening:

We load environment variables and import required modules
Composio manages connections to Whatsapp
MCPServerStreamableHTTP connects to the Whatsapp MCP server endpoint
Agent from Pydantic AI lets you define and run the AI assistant

Create a Tool Router Session

python

async def main():
    api_key = os.getenv("COMPOSIO_API_KEY")
    user_id = os.getenv("USER_ID")
    if not api_key or not user_id:
        raise RuntimeError("Set COMPOSIO_API_KEY and USER_ID in your environment")

    # Create a Composio Tool Router session for Whatsapp
    composio = Composio(api_key=api_key)
    session = composio.create(
        user_id=user_id,
        toolkits=["whatsapp"],
    )
    url = session.mcp.url
    if not url:
        raise ValueError("Composio session did not return an MCP URL")

What's happening:

We're creating a Tool Router session that gives your agent access to Whatsapp 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

Initialize the Pydantic AI Agent

python

# Attach the MCP server to a Pydantic AI Agent
whatsapp_mcp = MCPServerStreamableHTTP(url, headers={"x-api-key": COMPOSIO_API_KEY})
agent = Agent(
    "openai:gpt-5",
    toolsets=[whatsapp_mcp],
    instructions=(
        "You are a Whatsapp assistant. Use Whatsapp tools to help users "
        "with their requests. Ask clarifying questions when needed."
    ),
)

What's happening:

The MCP client connects to the Whatsapp endpoint
The agent uses GPT-5 to interpret user commands and perform Whatsapp operations
The instructions field defines the agent's role and behavior

Build the chat interface

python

# Simple REPL with message history
history = []
print("Chat started! Type 'exit' or 'quit' to end.\n")
print("Try asking the agent to help you with Whatsapp.\n")

while True:
    user_input = input("You: ").strip()
    if user_input.lower() in {"exit", "quit", "bye"}:
        print("\nGoodbye!")
        break
    if not user_input:
        continue

    print("\nAgent is thinking...\n", flush=True)

    async with agent.run_stream(user_input, message_history=history) as stream_result:
        collected_text = ""
        async for chunk in stream_result.stream_output():
            text_piece = None
            if isinstance(chunk, str):
                text_piece = chunk
            elif hasattr(chunk, "delta") and isinstance(chunk.delta, str):
                text_piece = chunk.delta
            elif hasattr(chunk, "text"):
                text_piece = chunk.text
            if text_piece:
                collected_text += text_piece
        result = stream_result

    print(f"Agent: {collected_text}\n")
    history = result.all_messages()

What's happening:

The agent reads input from the terminal and streams its response
Whatsapp API calls happen automatically under the hood
The model keeps conversation history to maintain context across turns

Run the application

python

if __name__ == "__main__":
    asyncio.run(main())

What's happening:

The asyncio loop launches the agent and keeps it running until you exit

Complete Code

Here's the complete code to get you started with Whatsapp and Pydantic AI:

python

import asyncio
import os
from dotenv import load_dotenv
from composio import Composio
from pydantic_ai import Agent
from pydantic_ai.mcp import MCPServerStreamableHTTP

load_dotenv()

async def main():
    api_key = os.getenv("COMPOSIO_API_KEY")
    user_id = os.getenv("USER_ID")
    if not api_key or not user_id:
        raise RuntimeError("Set COMPOSIO_API_KEY and USER_ID in your environment")

    # Create a Composio Tool Router session for Whatsapp
    composio = Composio(api_key=api_key)
    session = composio.create(
        user_id=user_id,
        toolkits=["whatsapp"],
    )
    url = session.mcp.url
    if not url:
        raise ValueError("Composio session did not return an MCP URL")

    # Attach the MCP server to a Pydantic AI Agent
    whatsapp_mcp = MCPServerStreamableHTTP(url, headers={"x-api-key": COMPOSIO_API_KEY})
    agent = Agent(
        "openai:gpt-5",
        toolsets=[whatsapp_mcp],
        instructions=(
            "You are a Whatsapp assistant. Use Whatsapp tools to help users "
            "with their requests. Ask clarifying questions when needed."
        ),
    )

    # Simple REPL with message history
    history = []
    print("Chat started! Type 'exit' or 'quit' to end.\n")
    print("Try asking the agent to help you with Whatsapp.\n")

    while True:
        user_input = input("You: ").strip()
        if user_input.lower() in {"exit", "quit", "bye"}:
            print("\nGoodbye!")
            break
        if not user_input:
            continue

        print("\nAgent is thinking...\n", flush=True)

        async with agent.run_stream(user_input, message_history=history) as stream_result:
            collected_text = ""
            async for chunk in stream_result.stream_output():
                text_piece = None
                if isinstance(chunk, str):
                    text_piece = chunk
                elif hasattr(chunk, "delta") and isinstance(chunk.delta, str):
                    text_piece = chunk.delta
                elif hasattr(chunk, "text"):
                    text_piece = chunk.text
                if text_piece:
                    collected_text += text_piece
            result = stream_result

        print(f"Agent: {collected_text}\n")
        history = result.all_messages()

if __name__ == "__main__":
    asyncio.run(main())

Conclusion

You've built a Pydantic AI agent that can interact with Whatsapp through Composio's Tool Router. With this setup, your agent can perform real Whatsapp actions through natural language. You can extend this further by:

Adding other toolkits like Gmail, HubSpot, or Salesforce
Building a web-based chat interface around this agent
Using multiple MCP endpoints to enable cross-app workflows (for example, Gmail + Whatsapp for workflow automation)

This architecture makes your AI agent "agent-native", able to securely use APIs in a unified, composable way without custom integrations.

TOOLS & TRIGGERS

Supported Tools and Triggers

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

Block WhatsApp Users

Block one or more WhatsApp users to prevent them from sending messages to your business phone number.

Configure WhatsApp Conversational Automation

Configure conversational automation settings for a WhatsApp Business phone number.

Create WhatsApp Flow

Create a new WhatsApp Flow for the WhatsApp Business Account.

Create WhatsApp Max Price Agreement

Create a max price agreement for WhatsApp marketing messages pricing.

Create message template

Create a new message template for the WhatsApp Business Account.

Create QR Code

Create a new QR code with a prefilled message for a WhatsApp Business phone number.

Create upload session for WhatsApp

Create a resumable upload session for large file uploads to WhatsApp.

Delete WhatsApp Media

Delete a WhatsApp media file previously uploaded via the Media API.

Delete message template

Delete a message template from the WhatsApp Business Account by name.

Delete QR Code

Delete a specific QR code from a WhatsApp Business phone number.

Deregister WhatsApp Business Phone Number

Deregister a WhatsApp Business phone number from the Cloud API.

Get WhatsApp Business Account Activities

Retrieve activity history for a WhatsApp Business Account.

Get WhatsApp Business Account Details

Retrieve comprehensive details about a WhatsApp Business Account (WABA).

Get WhatsApp Business Compliance Info

Retrieve comprehensive business compliance information for a WhatsApp Business phone number.

Get Business Encryption

Retrieve the WhatsApp Business public key and its signature verification status.

Get business profile

Get the business profile information for a WhatsApp Business phone number.

Get client WhatsApp Business Accounts

Retrieve WhatsApp Business Accounts shared with or managed by a business portfolio.

Get WhatsApp Commerce Settings

Get commerce settings for a WhatsApp Business phone number.

Get Flow Assets

List assets associated with a WhatsApp Flow.

Get Join Requests

Get all pending join requests for a WhatsApp group.

Get media info

Get metadata and download URL for uploaded WhatsApp media.

Get WhatsApp Message History

Retrieve message history for a WhatsApp Business phone number.

Get message templates

Get all message templates for the WhatsApp Business Account.

Get owned WhatsApp Business Accounts

Retrieve WhatsApp Business Accounts owned by a business portfolio.

Get phone number

Retrieve detailed information about a specific WhatsApp Business phone number.

Get phone numbers

Retrieve all phone numbers registered to your WhatsApp Business Account.

Get WhatsApp Schedules

Retrieve campaign schedules associated with a WhatsApp Business Account.

Get WhatsApp Cloud API Settings

Get Cloud API settings for a WhatsApp Business phone number.

Get Subscribed Apps

Get all applications currently subscribed to webhooks for a WhatsApp Business Account.

Get message template library

Browse the pre-built message template library for WhatsApp Business Account.

Get template status

Get the status and details of a specific message template.

List WhatsApp Flows

List all WhatsApp Flows associated with the WhatsApp Business Account.

List WhatsApp Groups

List all WhatsApp groups associated with a business phone number.

List qr codes

Get a list of all QR codes for a WhatsApp Business phone number.

List WhatsApp Solutions

Retrieve a paginated list of Multi-Partner Solutions for a WhatsApp Business Account.

Publish WhatsApp Flow

Publish a WhatsApp Flow to make it available for use.

Remove Assigned User from WhatsApp Business Account

Remove a user's access from the WhatsApp Business Account.

Send contacts

Send contacts WhatsApp number.

Send interactive buttons

Send an interactive button message with up to 3 reply buttons to a WhatsApp user.

Send interactive list

Send an interactive list message to a WhatsApp number.

Send location

Send a location message with coordinates, name, and address to a WhatsApp user.

Send media

Send a media message to a WhatsApp number.

Send media by

Send media using a media ID from previously uploaded media.

Send message

Send a text message to a WhatsApp user.

Send template message

Send a template message to a WhatsApp number.

Set WhatsApp Two-Step Verification PIN

Set or reset the two-step verification PIN for a WhatsApp Business phone number.

Subscribe to WABA Webhooks

Subscribe your application to receive webhook notifications for a WhatsApp Business Account (WABA).

Unsubscribe from WABA Webhooks

Unsubscribe your application from webhook events for a WhatsApp Business Account (WABA).

Update WhatsApp Flow Metadata

Update metadata for a WhatsApp Flow including its name, categories, and endpoint URI.

Update WhatsApp Business Profile

Update WhatsApp Business Profile information including business details, contact information, and profile settings.

Update WhatsApp commerce settings

Set or update commerce settings for a WhatsApp Business phone number.

Update Flow JSON

Update the Flow JSON configuration for a WhatsApp Flow.

Update WhatsApp Cloud API Settings

Update Cloud API settings for a WhatsApp Business phone number.

Upload media

Upload media files (images, videos, audio, documents, stickers) to WhatsApp servers.

Upsert message template

Create or update a message template for the WhatsApp Business Account.

Verify Phone Number OTP Code

Verify the OTP code for a pre-verified phone number.

Who Am I

Return the identity (name) of the connected WhatsApp (Meta) account.

FRAMEWORKS

How to build Whatsapp MCP Agent with another framework

Claude Code

Use Whatsapp MCP with Claude Code

Cursor

Use Whatsapp MCP with Cursor

ChatGPT

Use Whatsapp MCP with ChatGPT

Claude Cowork

Use Whatsapp MCP with Claude Cowork

Antigravity

Use Whatsapp MCP with Antigravity

OpenAI Agents SDK

Use Whatsapp MCP with OpenAI Agents SDK

Claude Agent SDK

Use Whatsapp MCP with Claude Agent SDK

Grok Bot

Use Whatsapp MCP with Grok Bot

Muse

Use Whatsapp MCP with Muse

Codex

Use Whatsapp MCP with Codex

Kimi Code

Use Whatsapp MCP with Kimi Code

Grok Build

Use Whatsapp MCP with Grok Build

VS Code

Use Whatsapp MCP with VS Code

OpenCode

Use Whatsapp MCP with OpenCode

OpenClaw

Use Whatsapp MCP with OpenClaw

Hermes

Use Whatsapp MCP with Hermes

Atomic Agent

Use Whatsapp MCP with Atomic Agent

Pi

Use Whatsapp MCP with Pi

DeepSeek Harness

Use Whatsapp MCP with DeepSeek Harness

CLI

Use Whatsapp MCP with CLI

Google ADK

Use Whatsapp MCP with Google ADK

LangChain

Use Whatsapp MCP with LangChain

Vercel AI SDK

Use Whatsapp MCP with Vercel AI SDK

Mastra AI

Use Whatsapp MCP with Mastra AI

LlamaIndex

Use Whatsapp MCP with LlamaIndex

CrewAI

Use Whatsapp MCP with CrewAI

AutoGen

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

Yes, you can. Pydantic AI fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right Whatsapp tools.

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

Start with Whatsapp.It takes 30 seconds.

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

Start building

How to integrate Whatsapp MCP with Pydantic AI

Connect Whatsapp without auth hassles

Introduction

Also integrate Whatsapp with

TL;DR

What is Pydantic AI?

What is the Whatsapp 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

Create a Tool Router Session

Initialize the Pydantic AI Agent

Build the chat interface

Run the application

Complete Code

Conclusion

Supported Tools and Triggers

How to build Whatsapp MCP Agent with another framework

Claude Code

Cursor

ChatGPT

Claude Cowork

Antigravity

OpenAI Agents SDK

Claude Agent SDK

Grok Bot

Muse

Codex

Kimi Code

Grok Build

VS Code

OpenCode

OpenClaw

Hermes

Atomic Agent

Pi

DeepSeek Harness

CLI

Google ADK

LangChain

Vercel AI SDK

Mastra AI

LlamaIndex

CrewAI

AutoGen

Explore Other Toolkits

Gmail

Outlook

Slack

Gong

Frequently asked questions

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

Can I use Tool Router MCP with Pydantic AI?+

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

How safe is my data with Composio Tool Router?+

Start with Whatsapp.It takes 30 seconds.