Twilio MCP Server

A Model Context Protocol (MCP) server that enables Claude and other AI assistants to send SMS and MMS messages using Twilio.

Demo

Features

• Send SMS messages 📱
• Pre-built prompts for common messaging scenarios 📝
• Secure handling of Twilio credentials 🔒

Requirements

• Node.js >= 18
  • If you need to update Node.js, we recommend using nvm (Node Version Manager):

    nvm install 18.14.2
    nvm alias default 18.14.2
    

  • If you encounter any errors in Claude Desktop, try running the following command in your terminal to verify the installation:

    npx -y @yiyang.1i/sms-mcp-server
    

Configuration

The server requires three environment variables:

• ACCOUNT_SID: Your Twilio account SID
• AUTH_TOKEN: Your Twilio auth token
• FROM_NUMBER: Your Twilio phone number (in E.164 format, e.g., +11234567890)

Claude Desktop Configuration

To use this server with Claude Desktop, add the following to your configuration file:

macOS: ~/Library/Application Support/Claude/claude_desktop_config.json

Windows: %APPDATA%Claudeclaude_desktop_config.json

{
  "mcpServers": {
    "twilio": {
      "command": "npx",
      "args": [
        "-y",
        "@yiyang.1i/sms-mcp-server"
      ],
      "env": {
        "ACCOUNT_SID": "your_account_sid",
        "AUTH_TOKEN": "your_auth_token",
        "FROM_NUMBER": "your_twilio_number"
      }
    }
  }
}

After that, restart Claude Desktop to reload the configuration. If connected, you should see Twilio under the 🔨 menu.

Example Interactions with Claude

Here are some natural ways to interact with the server through Claude:

1. Simple SMS:

Send a text message to the number +11234567890 saying "Don't forget about dinner tonight!"

2. Creative SMS:

Write a haiku about autumn and send it to my number +11234567890

Important Notes

1. Phone Number Format: All phone numbers must be in E.164 format (e.g., +11234567890)
2. Rate Limits: Be aware of your Twilio account’s rate limits and pricing
3. Security: Keep your Twilio credentials secure and never commit them to version control

Troubleshooting

Common error messages and solutions:

1. “Phone number must be in E.164 format”

   • Make sure the phone number starts with “+” and the country code

2. “Invalid credentials”

   • Double-check your ACCOUNT_SID and AUTH_TOKEN. You can copy them from the Twilio Console

Contributing

Contributions are welcome! Please read our contributing guidelines before submitting pull requests.

License

This project is licensed under the MIT License - see the LICENSE file for details.

Security

Please do not include any sensitive information (like phone numbers or Twilio credentials) in GitHub issues or pull requests.