MCP Server

CommunicationSMS / Voice / WhatsAppMIT

Twilio MCP Server

by Community · twilio/twilio-node

Twilio MCP Server connects your AI coding assistant to Twilio, the leading cloud communication platform. Your agent can send SMS messages, make voice calls, send WhatsApp messages, manage phone numbers, and track message delivery status — all through lightweight MCP tool calls without leaving your IDE or writing Twilio SDK boilerplate.

Twilio powers communication for over 10 million developers and 300,000 businesses globally. With the MCP server, your agent gains access to this infrastructure for notification systems, alerting pipelines, customer communication workflows, and two-factor authentication — turning complex telecom integrations into simple conversational commands.

Tools Exposed

send SMS, call, WhatsApp...

<3min

Setup

API keys + phone number

Channels

SMS, Voice, WhatsApp

MIT

License

open source

Quick Install

claude mcp add twilio -- npx twilio-mcp-server

Key Features

SMS Messaging

Send and receive SMS messages to any phone number worldwide. Support for long messages (automatic segmentation), Unicode characters, and MMS with media attachments. The agent can send individual messages or batch notifications to multiple recipients.

Voice Calls

Initiate outbound voice calls with text-to-speech or recorded audio. Configure call routing, set timeouts, and handle voicemail detection. Useful for urgent alerts that need immediate attention beyond what a text message provides.

WhatsApp Integration

Send WhatsApp messages through the same API as SMS. Support for text, media, templates, and interactive messages. Use the Twilio WhatsApp sandbox for testing or connect a registered WhatsApp Business number for production messaging.

Delivery Tracking

Check the delivery status of sent messages in real time — queued, sent, delivered, failed, or undelivered. The agent can monitor delivery rates, retry failed messages, and report on communication pipeline health.

Phone Number Management

Search for available phone numbers by country, area code, or capabilities (SMS, voice, MMS). Purchase and configure numbers, set webhook URLs for incoming messages, and release numbers you no longer need.

Message History & Logs

Query sent and received message logs with filters for date range, direction, and status. The agent can generate communication reports, audit message volumes, and troubleshoot delivery issues by examining message metadata.

Execution Brief

Use this page as a rollout checklist, not just reference text.

Suggest update

Tool Mapping Lens

Organize Tools by Workflow Phase

Catalog-oriented pages work best when users can map discovery, evaluation, and rollout in a clear path instead of reading an undifferentiated list.

Define the job-to-be-done first
Group tools by stage
Prioritize by adoption friction

Actionable Utility Module

Skill Implementation Board

Use this board for Twilio MCP Server before rollout. Capture inputs, apply one decision rule, execute the checklist, and log outcome.

Input: Objective

Deliver one measurable improvement with twilio mcp server claude code sms voice whatsapp communication automation notifications

Input: Baseline Window

20-30 minutes

Input: Fallback Window

8-12 minutes

Decision Trigger	Action	Expected Output
Input: one workflow objective and release owner are defined	Run preview execution with fixed acceptance criteria.	Go or hold decision backed by repeatable evidence.
Input: output quality below baseline or retries increase	Limit scope, isolate root issue, and rerun controlled test.	One confirmed correction path before wider rollout.
Input: checks pass for two consecutive replay windows	Promote to broader traffic with fallback path active.	Stable rollout with low operational surprise.

Execution Steps

Record objective, owner, and stop condition.
Execute one controlled preview run.
Measure quality, latency, and correction burden.
Promote only when pass criteria are stable.

Output Template

tool=twilio mcp server claude code sms voice whatsapp communication automation notifications
objective=
preview_result=pass|fail
primary_metric=
next_step=rollout|patch|hold

Share execution feedback

What Is Twilio MCP Server?

Twilio MCP Server is a Model Context Protocol bridge that connects AI coding assistants to Twilio, the cloud communication platform trusted by millions of developers for SMS, voice, and WhatsApp messaging. It wraps the Twilio REST API into MCP tools that any compatible client — Claude Code, Cursor, Continue — can invoke directly from the development environment.

Communication features are essential to most modern applications but often require significant boilerplate — initializing the Twilio client, formatting phone numbers, handling errors, and managing delivery callbacks. Twilio MCP eliminates this friction by letting developers interact with the platform conversationally. Ask "send an SMS to +1-555-0123 saying the deploy succeeded" and the agent handles the rest.

The server supports the three primary Twilio channels: SMS for text messages with global coverage, voice for outbound calls with text-to-speech, and WhatsApp for rich messaging through the Business API. Each channel is exposed as a set of MCP tools with consistent parameters, making it easy to switch between channels or send the same notification across multiple channels.

Twilio MCP integrates naturally with the broader MCP ecosystem to build complete notification and communication workflows. Stripe MCP can trigger payment confirmation messages, Supabase MCP can store communication logs and user preferences, and Slack MCP handles internal team notifications while Twilio handles customer-facing messages. This separation keeps your communication architecture clean and maintainable.

How to Calculate Better Results with twilio mcp server claude code sms voice whatsapp communication automation notifications

Create a Twilio account at twilio.com and navigate to the Console Dashboard. Copy your Account SID and Auth Token from the dashboard — these authenticate all API requests. If you are using the free trial, you get a small credit balance for testing without entering payment information.

Get a Twilio phone number. In the Console, go to Phone Numbers and either use the number assigned during signup or buy a new one. Choose a number with SMS and voice capabilities in your target country. Set this number as your TWILIO_PHONE_NUMBER environment variable alongside TWILIO_ACCOUNT_SID and TWILIO_AUTH_TOKEN.

Register the MCP server with your AI client using the quick install command. The server reads your Twilio credentials at startup and initializes the Twilio SDK client. For WhatsApp testing, also join the Twilio WhatsApp sandbox by sending "join <sandbox-keyword>" to the Twilio WhatsApp number from your device.

Test the setup by asking your agent to send an SMS to your personal phone number with a test message. If you receive the message within a few seconds, the pipeline is working. Next, try checking the delivery status of the message and listing recent message logs to verify the full read and write path.

Treat this page as a decision map. Build a shortlist fast, then run a focused second pass for security, ownership, and operational fit.

When a team keeps one shared selection rubric, tool adoption speeds up because evaluators stop debating criteria every time a new option appears.

Worked Examples

Building a deployment notification system

Your team wants SMS alerts whenever a production deployment succeeds or fails, with different urgency levels
Ask the agent to create a notification function that takes a deployment status (success, failure, rollback) and a list of team phone numbers
For successful deployments, the agent sends an SMS with the version number, environment, and deployment time to the on-call engineer
For failures, the agent escalates by both sending an SMS and initiating a voice call to the on-call engineer with a text-to-speech alert
The agent queries message delivery status to confirm all notifications were received and logs any failed deliveries
A daily summary SMS is sent each morning showing the previous day's deployment count, success rate, and any unresolved incidents

Outcome: A multi-channel deployment alerting system that sends SMS for routine events, escalates to voice calls for failures, and provides daily summaries — all orchestrated by the agent through MCP tool calls.

Customer order notification pipeline

Your e-commerce application needs to send order confirmations, shipping updates, and delivery notifications via SMS and WhatsApp
Ask the agent to design a notification flow with three message templates: order confirmed, order shipped (with tracking link), and order delivered
The agent creates each template with dynamic placeholders for customer name, order number, and tracking URL
When an order event triggers, the agent checks the customer's preferred channel (SMS or WhatsApp) from Supabase MCP and sends the appropriate message
The agent monitors delivery status for each notification and retries failed messages once after a 30-second delay
At the end of each day, the agent generates a report showing total notifications sent, delivery success rate per channel, and any permanently failed messages

Outcome: A production-ready order notification pipeline supporting both SMS and WhatsApp channels with automatic retries and daily reporting, built entirely through conversational MCP interactions.

Frequently Asked Questions

What is the Twilio MCP Server?

Twilio MCP Server is a Model Context Protocol integration that connects AI coding assistants to the Twilio communication platform. It exposes messaging (SMS, WhatsApp), voice calling, phone number management, and delivery tracking as MCP tools. Your agent can send notifications, verify phone numbers, and check message status directly from Claude Code or any MCP-compatible client.

How do I set up Twilio MCP?

Sign up for a Twilio account and obtain your Account SID, Auth Token, and a phone number from the Twilio Console. Set these as environment variables (TWILIO_ACCOUNT_SID, TWILIO_AUTH_TOKEN, TWILIO_PHONE_NUMBER) and register the MCP server with your AI client. Twilio offers a free trial with credit for testing, so you can start without a paid plan.

Can Twilio MCP send WhatsApp messages?

Yes. Twilio supports WhatsApp messaging through the same API as SMS. The MCP server can send WhatsApp messages using the Twilio WhatsApp sandbox for testing or a registered WhatsApp Business number for production. You prefix the recipient number with "whatsapp:" to route through the WhatsApp channel instead of SMS.

What are common use cases for Twilio MCP?

Common use cases include sending deployment notifications to your team via SMS, triggering alert messages when monitoring detects issues, sending verification codes for two-factor authentication flows, notifying customers about order updates, and making automated voice calls for urgent alerts. It is especially useful for building notification systems into agent workflows.

How much does it cost to use Twilio MCP?

The MCP server itself is free and open source. Twilio charges per message and per minute for calls — typically around $0.0079 per SMS in the US, with international rates varying by country. Twilio offers a free trial with credit to get started. The MCP server does not add any markup to Twilio pricing.

Can I use Twilio MCP for two-factor authentication?

Yes. The agent can generate a random verification code, send it via SMS or WhatsApp using Twilio MCP, and then verify the code the user provides. For production 2FA, Twilio also offers the Verify API which handles code generation, delivery, and validation with built-in rate limiting and fraud detection.

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