Twilio Messaging MCP Server

An MCP server for sending SMS messages via Twilio API. This server provides tools, resources, and prompts for interacting with the Twilio Messaging API.

Features

• Send SMS messages via Twilio
• Get status callbacks from Twilio with enhanced handling via @deshartman/mcp-status-callback
• Integrates with Claude AI via the Model Context Protocol (MCP)
• Executable via npx for easy usage without installation

Prerequisites

• Node.js >= 18.0.0
• Twilio account with:
  • Account SID
  • API Key and Secret
  • Twilio phone number
• ngrok account with:
  • Auth token
  • Custom domain (optional)

Installation

npm install @deshartman/twilio-messaging-mcp-server

Or run directly with npx:

npx @deshartman/twilio-messaging-mcp-server <accountSid> <apiKey> <apiSecret> <number>

NPX Usage

The package can be executed directly using npx without installation:

# Run with required parameters
npx @deshartman/twilio-messaging-mcp-server <accountSid> <apiKey> <apiSecret> <number>

# With environment variables for ngrok
env NGROK_AUTH_TOKEN=your_token NGROK_CUSTOM_DOMAIN=your_domain.ngrok.dev npx @deshartman/twilio-messaging-mcp-server <accountSid> <apiKey> <apiSecret> <number>

This is possible because the package includes the “bin” field in package.json, making it executable via npx.

Environment Variables

• NGROK_AUTH_TOKEN: Your ngrok authentication token (required for callback handling)
• NGROK_CUSTOM_DOMAIN: Your custom ngrok domain (optional)

Usage

Running the Server

You can run the server using the provided script with a .env file:

# Create a .env file with your credentials
# See .env.example for the required format

# Run the server (no arguments needed)
./run-server.sh

The .env file should contain:

ACCOUNT_SID=YOUR_ACCOUNT_SID
API_KEY=YOUR_API_KEY
API_SECRET=YOUR_API_SECRET
TWILIO_NUMBER=YOUR_TWILIO_PHONE_NUMBER
NGROK_AUTH_TOKEN=YOUR_NGROK_AUTH_TOKEN
NGROK_CUSTOM_DOMAIN=your-domain.ngrok.dev

This approach improves security by keeping credentials out of command history and simplifies the execution process.

Directly with Node.js

env NGROK_AUTH_TOKEN=your_ngrok_auth_token NGROK_CUSTOM_DOMAIN=your_domain.ngrok.dev node build/index.js <accountSid> <apiKey> <apiSecret> <number>

MCP Integration

This server provides the following MCP capabilities:

Tools

• send-sms: Send an SMS message via Twilio with server readiness validation

Resources

• twilio://statuscallback: Get the last raw status callback data from Twilio with enhanced error handling

Prompts

• SendSMS: Prompt for sending an SMS using Twilio Messaging MCP Server

Troubleshooting

ngrok Tunnel Issues

If you encounter an error like:

failed to start tunnel: The endpoint 'https://your-domain.ngrok.dev' is already online.

You have a few options:

1. Stop your existing endpoint first
2. Use a different domain name
3. Start both endpoints with --pooling-enabled to load balance between them

ENOTEMPTY Error

If you encounter an npm error like:

npm ERR! code ENOTEMPTY
npm ERR! syscall rename

Try running the server directly with Node.js instead of using npx.

License

MIT