Twilio WhatsApp FastMCP Server 💬

This project provides a simple FastMCP server that allows sending WhatsApp messages using the Twilio API.

Features

• 📲 Sends WhatsApp messages via Twilio.

• 🤖 Exposes a send_whatsapp tool for use with FastMCP clients (like AI models).

• 🔒 Loads configuration securely from a .env file.

• 🧪 Includes a basic test script (/home/rj/Code/mcp-generated/twilio_test.py) for direct Twilio API interaction.

Related MCP server: WhatsApp Web MCP

Setup

1. Get the Code: Clone this repository or download the source files into /home/rj/Code/mcp-generated/.

2. **Create a Virtual Environment (Recommended){ @@ -77,11 +77,11 @@

2. Running the Test Script

-The /home/rj/Code/mcp-generated/twilio_test.py script provides a way to directly test sending a message using your Twilio credentials without the FastMCP server. +The /home/rj/Code/mcp-generated/twilio_test.py script provides a way to directly test sending a message using your Twilio credentials without the FastMCP server. 🛠️

• Modify the script: Ensure the to= number in /home/rj/Code/mcp-generated/twilio_test.py is a WhatsApp number linked to your Twilio Sandbox (if using the Sandbox) or any valid WhatsApp number (if using a purchased Twilio number). The from_ number should typically be your Twilio Sandbox number (whatsapp:+14155238886) or your purchased Twilio WhatsApp number.

• Run the script:

python /home/rj/Code/mcp-generated/twilio_test.py

```
This will attempt to send a hardcoded message ("Is this working?") from the specified Twilio number to the specified recipient.

:** bash 🌱 cd /home/rj/Code/mcp-generated/ python -m venv venv source venv/bin/activate # On Windows use `venv\Scripts\activate`

3. Install Dependencies: The necessary dependencies are listed in /home/rj/Code/mcp-generated/whatsapp_server.py. You can install them using pip:

   pip install twilio python-dotenv pydantic-settings fastmcp

   Alternatively, if using the FastMCP framework features:

   fastmcp install /home/rj/Code/mcp-generated/whatsapp_server.py

4. Configure Environment Variables:

   • Sign up for a Twilio account if you don't have one.

   • Get your Account SID and Auth Token from the Twilio Console.

   • Set up the Twilio Sandbox for WhatsApp or configure a dedicated Twilio WhatsApp number.

   • Create a file named .env in the project root directory (/home/rj/Code/mcp-generated/).

   • Add your Twilio credentials and WhatsApp number to the .env file: 🔑

     # /home/rj/Code/mcp-generated/.env
     TWILIO_ACCOUNT_SID=ACxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
     TWILIO_AUTH_TOKEN=your_auth_token_here
     TWILIO_WHATSAPP_NUMBER=+14155238886 # Use your Twilio WhatsApp number (Sandbox or purchased)

   • Important: Replace the placeholder values with your actual credentials and number. Ensure the TWILIO_WHATSAPP_NUMBER starts with a + and includes the country code (E.164 format). The whatsapp_server.py script will automatically add the + if it's missing from the .env file. ❗

   • Trial Account Note: If you are using a Twilio trial account, the TWILIO_WHATSAPP_NUMBER will likely be the Twilio Sandbox number (+14155238886). You must enroll any recipient (to_number) phone numbers in your Twilio Sandbox via the Twilio console for messages to be delivered successfully. Sending to non-enrolled numbers requires upgrading your Twilio account.

Usage

1. Running the FastMCP Server

To make the send_whatsapp tool available for remote calls (e.g., from an AI model integrated with FastMCP):

python /home/rj/Code/mcp-generated/whatsapp_server.py

The server will start and print the Twilio number it's configured to use. It will listen for incoming requests (by default via stdio, but FastMCP supports other transports). A FastMCP client can then call the send_whatsapp tool with to_number (including the whatsapp: prefix, e.g., whatsapp:+15551234567) and message arguments.

Example Interaction (Conceptual):

A client (like an AI 🤖) might send a request like this (format depends on the transport):

{
  "tool_name": "send_whatsapp",
  "arguments": {
    "to_number": "whatsapp:+15551234567",
    "message": "Hello from the FastMCP server!"
  }
}

The server will process this, call the Twilio API, and return a confirmation or error message.

2. Running the Test Script

The /home/rj/Code/mcp-generated/twilio_test.py script provides a way to directly test sending a message using your Twilio credentials without the FastMCP server. 🛠️

• Modify the script: Ensure the to= number in /home/rj/Code/mcp-generated/twilio_test.py is a WhatsApp number linked to your Twilio Sandbox (if using the Sandbox) or any valid WhatsApp number (if using a purchased Twilio number). The from_ number should typically be your Twilio Sandbox number (whatsapp:+14155238886) or your purchased Twilio WhatsApp number.

• Run the script:

  python /home/rj/Code/mcp-generated/twilio_test.py

  This will attempt to send a hardcoded message ("Is this working?") from the specified Twilio number to the specified recipient.