twilio-mcp

Dedalus MCP server for Twilio communications. It exposes SMS/MMS sending, message listing, message lookup, outbound calls, incoming phone number listing, and phone number lookup.

Tools

• send_sms - Send an SMS or MMS.

• list_messages - List account messages with optional filters.

• get_message - Fetch one message by Message SID.

• make_call - Start an outbound voice call.

• list_phone_numbers - List incoming phone numbers on the account.

• lookup_phone_number - Lookup a phone number with Twilio Lookup v2.

Related MCP server: Fonoster MCP Server

Safety Notes

Twilio write tools can cost money and contact real users.

• send_sms sends a real SMS/MMS and may incur messaging charges.

• make_call starts a real phone call and may incur voice charges.

• lookup_phone_number may incur Lookup charges depending on requested fields.

Confirm phone numbers, message bodies, call URLs, and user intent before using write tools. Do not run src/_client.py against production phone numbers unless you intentionally want to send a test SMS and place a test call.

Never commit Twilio Account SIDs with auth tokens, message bodies, phone number lists, call logs, or Lookup results containing personal data.

Authentication

Twilio REST uses HTTP Basic auth where username is TWILIO_ACCOUNT_SID and password is TWILIO_AUTH_TOKEN. Current dedalus_mcp.Connection accepts one secret value for header injection, so this server uses:

Authorization: Basic <base64(TWILIO_ACCOUNT_SID:TWILIO_AUTH_TOKEN)>

Connection details:

• Connection names: twilio_rest for api.twilio.com and twilio_lookup for lookups.twilio.com

• Secret key: TWILIO_BASIC_AUTH

• Header format: Basic {api_key}

• Base URLs: https://api.twilio.com, https://lookups.twilio.com

Required variables:

TWILIO_ACCOUNT_SID=ACxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
TWILIO_BASIC_AUTH=<base64 of ACCOUNT_SID:AUTH_TOKEN>
DEDALUS_AS_URL=https://as.dedaluslabs.ai

For local convenience, src/twilio_tools.py and src/_client.py can derive TWILIO_BASIC_AUTH when both TWILIO_ACCOUNT_SID and TWILIO_AUTH_TOKEN are present. Prefer storing only TWILIO_BASIC_AUTH as the DAuth credential in production.

Run Locally

uv run python src/main.py

In another terminal:

MCP_SERVER_URL=http://127.0.0.1:8080/mcp uv run python src/_client.py

Set TWILIO_TEST_FROM, TWILIO_TEST_TO, TWILIO_TEST_MESSAGE_SID, and TWILIO_TEST_CALL_URL to safe test resources. The client intentionally calls paid/user-contacting tools.

Deploy

Publish as dedalus-labs/twilio-mcp, configure TWILIO_BASIC_AUTH as a required DAuth credential and TWILIO_ACCOUNT_SID as an environment variable or required config, deploy, then run:

DEDALUS_MCP_SERVER_ONLY=1 DEDALUS_MCP_SERVER=dedalus-labs/twilio-mcp uv run python src/_client.py