What Is Twilio MCP Server?

Twilio MCP Server is an MCP integration maintained by Twilio Labs that exposes Twilio’s communication APIs — SMS, voice calls, number lookup, and messaging analytics — directly to Claude Code. It lets you issue natural language instructions that translate into authenticated Twilio API calls without leaving your development environment.

Quick Facts

FieldValue
Packagemcp-twilio
Installnpx mcp-twilio
Compatible withClaude Code
Statusactive
GitHubhttps://github.com/twilio-labs/mcp

What You Can Do With It

  • Send SMS: Compose and dispatch SMS messages to one or more recipients using your Twilio phone number directly from a Claude session.
  • Make and manage calls: Initiate outbound voice calls or query the status of existing calls through the Twilio Programmable Voice API.
  • Number lookup: Retrieve carrier and line-type metadata for a given phone number to validate or enrich contact data.
  • Messaging analytics: Query delivery status, error codes, and message history to audit outbound communications or debug failed sends.

How to Set It Up

Prerequisites: A Twilio account with an active Account SID, Auth Token, and at least one provisioned phone number.

1. Run the server

npx mcp-twilio
**2. Configure Claude Code**

Add the server to your Claude Code MCP configuration file (`.claude/mcp.json` or `claude_desktop_config.json` depending on your setup):

```json
{
  "mcpServers": {
    "twilio": {
      "command": "npx",
      "args": ["mcp-twilio"],
      "env": {
        "TWILIO_ACCOUNT_SID": "your_account_sid_here",
        "TWILIO_AUTH_TOKEN": "your_auth_token_here",
        "TWILIO_PHONE_NUMBER": "+1xxxxxxxxxx"
      }
    }
  }
}

Replace the placeholder values with your actual Twilio credentials. The TWILIO_PHONE_NUMBER should be in E.164 format.

3. Verify the connection

Restart Claude Code after saving the config. The Twilio server should appear in your active MCP servers list. You can confirm it’s reachable by asking Claude to list available Twilio tools.

Works Best With

Twilio MCP Server is documented as compatible with Claude Code. This makes it a practical fit for developer workflows where you need to test SMS delivery, debug call flows, or inspect messaging logs during active development — all without switching to the Twilio Console or writing ad hoc API scripts.

Known Limitations

  • Credentials required: The server will not start without valid TWILIO_ACCOUNT_SID and TWILIO_AUTH_TOKEN values. Store these in environment variables or a secrets manager — do not hardcode them in the config file.
  • Twilio API rate limits apply: All requests go through Twilio’s standard API, so rate limits, per-account quotas, and trial account restrictions (e.g., only sending to verified numbers) are enforced as normal.
  • Billing: Every SMS sent or call initiated via this server counts against your Twilio account balance. Be careful when testing in a session where Claude may interpret instructions broadly.
  • No built-in sandbox: There is no simulation mode — all operations hit live Twilio endpoints. Use Twilio’s test credentials if you need to run dry-run tests.
  • Scope: The server covers documented use cases (SMS, calls, lookup, analytics). Advanced Twilio products such as Conversations, Flex, or Verify are not listed as supported features.

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