# Twilio MCP Server
A Model Context Protocol (MCP) server for Twilio that enables AI-powered SMS messaging with intelligent conversation management.
## Features
- **Send SMS** - Send text messages via Twilio with automatic conversation threading
- **Receive SMS** - Process inbound messages via webhooks with automatic storage
- **Conversation Management** - Track and manage multi-turn SMS conversations
- **Message Status** - Check delivery status of sent messages
- **Thread Association** - Automatically link messages to conversation threads
- **MMS Support** - Send and receive multimedia messages (optional)
## Installation
```bash
# Clone the repository
git clone <repository-url>
cd twilio-mcp
# Install dependencies
npm install
# Build the project
npm run build
```
## Configuration
1. Copy the environment template:
```bash
cp .env.example .env
```
2. Fill in your Twilio credentials in `.env`:
```bash
# Get these from https://console.twilio.com
TWILIO_ACCOUNT_SID=ACxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
TWILIO_AUTH_TOKEN=your_auth_token_here
TWILIO_PHONE_NUMBER=+1234567890
# Webhook configuration
WEBHOOK_PORT=3000
WEBHOOK_BASE_URL=https://your-domain.com
# Database path
DATABASE_PATH=./data/twilio.db
```
## Setting Up Webhooks
For the server to receive inbound SMS, you need to configure Twilio webhooks:
### Development (Using ngrok)
1. Install ngrok: https://ngrok.com/download
2. Start the webhook server:
```bash
npm run dev
```
3. In another terminal, start ngrok:
```bash
ngrok http 3000
```
4. Copy the HTTPS URL from ngrok (e.g., `https://abc123.ngrok.io`)
5. Configure Twilio webhook:
- Go to https://console.twilio.com/us1/develop/phone-numbers/manage/incoming
- Select your phone number
- Under "Messaging Configuration":
- Webhook URL: `https://abc123.ngrok.io/webhooks/twilio/sms`
- HTTP Method: POST
- Under "Status Callback URL":
- URL: `https://abc123.ngrok.io/webhooks/twilio/status`
- Save
### Production
Deploy the webhook server to a production environment with HTTPS and configure the Twilio webhook URLs accordingly.
## Usage with Claude Code
Add this server to your Claude Code MCP configuration:
```json
{
"mcpServers": {
"twilio": {
"command": "node",
"args": ["/path/to/twilio-mcp/dist/index.js"],
"env": {
"TWILIO_ACCOUNT_SID": "ACxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
"TWILIO_AUTH_TOKEN": "your_auth_token",
"TWILIO_PHONE_NUMBER": "+1234567890",
"WEBHOOK_PORT": "3000",
"WEBHOOK_BASE_URL": "https://your-webhook-url.com",
"DATABASE_PATH": "./data/twilio.db"
}
}
}
}
```
## MCP Tools
### send_sms
Send an SMS message via Twilio.
**Parameters:**
- `to` (required): Recipient phone number in E.164 format (+1234567890)
- `message` (required): SMS content (1-1600 characters)
- `from` (optional): Sender phone number (uses default if not provided)
- `conversationId` (optional): UUID of existing conversation
**Example:**
```typescript
{
"to": "+1234567890",
"message": "Hello from Twilio MCP!"
}
```
**Response:**
```json
{
"messageSid": "SMxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
"status": "queued",
"to": "+1234567890",
"from": "+1987654321",
"conversationId": "550e8400-e29b-41d4-a716-446655440000",
"timestamp": "2025-01-15T10:30:00.000Z"
}
```
### get_inbound_messages
Query received SMS/MMS messages from storage.
**Parameters:**
- `from` (optional): Filter by sender phone number
- `to` (optional): Filter by recipient phone number
- `conversationId` (optional): Filter by conversation UUID
- `since` (optional): ISO 8601 timestamp to filter messages after this date
- `limit` (optional): Maximum messages to return (default: 50)
**Example:**
```typescript
{
"from": "+1234567890",
"limit": 10
}
```
### create_conversation
Initialize a new conversation thread.
**Parameters:**
- `participants` (required): Array of phone numbers in E.164 format (min 2)
- `metadata` (optional): Custom metadata object
**Example:**
```typescript
{
"participants": ["+1234567890", "+1987654321"],
"metadata": {
"campaign": "support",
"priority": "high"
}
}
```
### get_conversation_thread
Retrieve full conversation history with all messages.
**Parameters:**
- `conversationId` (required): UUID of the conversation
- `includeContext` (optional): Include AI context summary (default: false)
**Example:**
```typescript
{
"conversationId": "550e8400-e29b-41d4-a716-446655440000",
"includeContext": true
}
```
### get_message_status
Check the delivery status of a sent message.
**Parameters:**
- `messageSid` (required): Twilio message SID
**Example:**
```typescript
{
"messageSid": "SMxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
}
```
**Response:**
```json
{
"messageSid": "SMxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
"status": "delivered",
"timestamp": "2025-01-15T10:31:00.000Z",
"to": "+1234567890",
"from": "+1987654321"
}
```
## Conversation Threading
The server automatically creates and manages conversation threads:
1. **Outbound Messages**: When sending an SMS:
- If `conversationId` is provided, the message is linked to that conversation
- If not provided, the server finds an existing conversation by participant pair
- If no conversation exists and `AUTO_CREATE_CONVERSATIONS=true`, a new one is created
2. **Inbound Messages**: When receiving an SMS via webhook:
- The server matches by participant pair (from/to numbers)
- If no conversation exists and `AUTO_CREATE_CONVERSATIONS=true`, a new one is created
- Messages are automatically stored and linked to the conversation
3. **Participant Matching**: Conversations are identified by normalized participant pairs:
- `[+1234567890, +1987654321]` matches the same conversation regardless of direction
## Architecture
```
twilio-mcp/
├── src/
│ ├── index.ts # MCP server entry point
│ ├── server.ts # MCP server with tool registry
│ ├── webhook-server.ts # Express server for webhooks
│ ├── config/
│ │ └── env.ts # Environment configuration
│ ├── services/
│ │ └── twilio-client.ts # Twilio SDK wrapper
│ ├── storage/
│ │ ├── conversation-store.ts # Conversation persistence
│ │ └── message-store.ts # Message persistence
│ ├── tools/
│ │ ├── send-sms.ts
│ │ ├── get-inbound-messages.ts
│ │ ├── create-conversation.ts
│ │ ├── get-conversation-thread.ts
│ │ └── get-message-status.ts
│ └── types/
│ └── models.ts # TypeScript type definitions
└── data/ # SQLite database storage
```
## Development
```bash
# Run in development mode
npm run dev
# Build TypeScript
npm run build
# Run tests
npm test
# Run tests in watch mode
npm run test:watch
# Run tests with coverage report
npm run test:coverage
# Type check
npm run lint
```
## Testing
The project includes a comprehensive test suite using Jest with TypeScript support.
### Test Structure
```
tests/
├── setup.ts # Test environment setup
├── config/
│ └── env.test.ts # Environment configuration validation tests
├── services/
│ └── twilio-client.test.ts # Twilio client service tests
├── storage/
│ ├── conversation-store.test.ts # Conversation persistence tests
│ └── message-store.test.ts # Message persistence tests
├── tools/
│ ├── send-sms.test.ts # SMS sending schema validation
│ ├── create-conversation.test.ts # Conversation creation tests
│ ├── get-conversation-thread.test.ts
│ ├── get-inbound-messages.test.ts
│ └── get-message-status.test.ts
└── webhook-server.test.ts # Webhook endpoint tests
```
### What's Tested
- **Schema Validation**: All MCP tool input schemas are tested for valid/invalid inputs
- **Storage Operations**: SQLite conversation and message stores (CRUD operations)
- **Webhook Handlers**: Inbound SMS and status callback endpoints with signature validation
- **Environment Config**: All environment variable validation rules
- **Twilio Client**: Client instantiation and method signatures
### Running Tests
```bash
# Run all tests
npm test
# Watch mode for development
npm run test:watch
# Generate coverage report
npm run test:coverage
```
### Test Environment
Tests use an in-memory SQLite database and mock environment variables configured in `tests/setup.ts`.
## Security
- **No Hardcoded Secrets**: All credentials are stored in environment variables
- **Webhook Validation**: All Twilio webhooks are validated using signature verification
- **Input Validation**: All tool inputs are validated using Zod schemas
- **HTTPS Required**: Webhook endpoints must use HTTPS in production
## Database
The server uses SQLite for storing conversations and messages:
- **Conversations**: Thread metadata, participants, timestamps
- **Messages**: SMS/MMS content, delivery status, media URLs
Database file location: `./data/twilio.db` (configurable via `DATABASE_PATH`)
## Environment Variables
| Variable | Required | Default | Description |
|----------|----------|---------|-------------|
| `TWILIO_ACCOUNT_SID` | Yes | - | Twilio Account SID (starts with AC) |
| `TWILIO_AUTH_TOKEN` | Yes | - | Twilio Auth Token |
| `TWILIO_PHONE_NUMBER` | Yes | - | Your Twilio phone number (E.164 format) |
| `WEBHOOK_PORT` | No | 3000 | Port for webhook server |
| `WEBHOOK_BASE_URL` | Yes | - | Public HTTPS URL for webhooks |
| `DATABASE_PATH` | No | ./data/twilio.db | SQLite database file path |
| `LOG_LEVEL` | No | info | Logging level (debug, info, warn, error) |
| `AUTO_CREATE_CONVERSATIONS` | No | true | Auto-create conversations for new threads |
| `ENABLE_AI_CONTEXT` | No | true | Enable AI context generation |
| `ENABLE_MMS` | No | true | Enable MMS support |
## License
MIT
## Support
For issues and questions:
- Twilio Documentation: https://www.twilio.com/docs
- MCP Documentation: https://modelcontextprotocol.io
