twilio-mcp

Simple MCP server for sending SMS via Twilio. Pure TypeScript, no build step.

Why this exists: The official Twilio MCP has a bug that causes invalid tool schemas, making it unusable with Claude. This is a minimal alternative that just works.

Usage

npx tsx src/index.ts --account-sid <sid> --auth-token <token> --messaging-service-sid <sid> [--default-to <number>]

Arguments

• --account-sid - Twilio Account SID (required)
• --auth-token - Twilio Auth Token (required)
• --messaging-service-sid - Twilio Messaging Service SID (required)
• --default-to - Default recipient phone number (optional)

Claude Code Configuration

Add to ~/.claude/settings.json:

{
  "mcpServers": {
    "twilio": {
      "command": "npx",
      "args": [
        "tsx",
        "/path/to/twilio-mcp/src/index.ts",
        "--account-sid", "YOUR_ACCOUNT_SID",
        "--auth-token", "YOUR_AUTH_TOKEN",
        "--messaging-service-sid", "YOUR_MESSAGING_SERVICE_SID",
        "--default-to", "+1987654321"
      ]
    }
  }
}

Tools

send_text

Send an SMS message.

Parameters:

• to (optional if --default-to is set) - Recipient phone number in E.164 format
• message (required) - The text message to send