Twilio
APIs for SMS, RCS, voice and email, plus phone number lookup and identity verification.
Updated Sep 27, 2026
Overview
Twilio provides APIs to send SMS, MMS and WhatsApp messages, place voice
calls, look up phone numbers and verify users with one-time codes. The
twilio CLI reaches every Twilio REST API through twilio api:... commands.
It reads credentials from TWILIO_ACCOUNT_SID, TWILIO_API_KEY (an API key
SID) and TWILIO_API_SECRET, or from a profile that twilio login saves.
Twilio also documents apt, Scoop, Docker and npm installs of the CLI.
The REST APIs behind those commands live on several hosts, such as
https://api.twilio.com for messages and calls, https://verify.twilio.com
and https://lookups.twilio.com, and take HTTP Basic auth with an API key SID
as the username and its secret as the password; each tool names its REST call.
Twilio's hosted MCP server at https://mcp.twilio.com/docs searches Twilio's
API specs and docs but does not make calls.
Workflows
Workflows that use Twilio's tools.
Tools
What agents can reach at Twilio.
Check a verification codeChecks the code a user entered against their pending verification and returns its status, approved when the code is right.
- Look up a phone number
Validates a phone number and returns it in E.164 and national formats, plus line type, caller name or other data you request.
- Make a phone call
Places an outbound call from a Twilio number to a phone number, SIP address or client and runs the TwiML you give it when the call connects.
- Send a message
Sends an SMS, MMS or WhatsApp message from a Twilio sender to one recipient and returns the new Message resource.
- Send a verification code
Starts verifying a phone number or email address by sending a one-time code over SMS, WhatsApp, a voice call or email.