// MCP TOOL REFERENCE

TWILIO TOOLS

36 tools from the Twilio MCP Server, categorised by risk level.

// ALL 36 TWILIO TOOLS

READ 21 tools

Read check_verification Check a verification code Read get_account Get Twilio account details Read get_call Get details of a specific voice call Read get_flow Get details of a Studio flow Read get_incoming_phone_number Get details of a specific phone number Read get_message Get details of a specific SMS/MMS message Read list_accounts List Twilio accounts Read list_calls List voice calls with optional filters Read list_conversations List conversations Read list_environments List environments for a service Read list_executions List executions of a Studio flow Read list_flows List Studio flows Read list_functions List functions in a serverless service Read list_incoming_phone_numbers List phone numbers on the account Read list_messages List SMS/MMS messages with filters Read list_services List serverless services Read list_task_queues List task queues in a workspace Read list_verification_services List verification services Read list_workers List workers in a workspace Read list_workspaces List TaskRouter workspaces Read lookup_phone_number Look up information about a phone number

WRITE 9 tools

Write add_conversation_participant Add a participant to a conversation Write create_conversation Create a new conversation Write create_function Create a serverless function on Twilio Write create_service Create a serverless service Write create_task Create a task in a TaskRouter workspace Write create_verification_service Create a verification service Write send_conversation_message Send a message in a conversation Write update_call Modify an in-progress voice call Write update_incoming_phone_number Update phone number configuration

EXECUTE 2 tools

Execute create_deployment Deploy serverless functions to Twilio Execute create_execution Trigger a Studio flow execution

FINANCIAL 4 tools

Financial create_call Initiate a voice call via Twilio Financial create_incoming_phone_number Purchase a phone number on Twilio Financial create_verification Start a verification via SMS, call, or email Financial send_message Send an SMS or MMS message via Twilio

// RUNNING THIS SERVER

The managed route: connect Twilio through the PolicyLayer gateway — every tool call above is checked against your policy before it runs, with a full audit log.

DIRECT INSTALL (UNMANAGED) npx -y @twilio-labs/mcp

// FAQ

How many tools does the Twilio MCP server have? +

The Twilio MCP server exposes 36 tools across 4 categories: Read, Write, Execute, Financial.

How do I enforce policies on Twilio tools? +

Route the Twilio server through the PolicyLayer gateway. Define allow, deny, or approval rules per tool in the dashboard — they are enforced on every call before it reaches the server.

What risk categories do Twilio tools fall into? +

Twilio tools are categorised as Read (21), Write (9), Execute (2), Financial (4). Each category has a recommended default policy.

Let agents act without letting them run wild.

Route your MCP servers through PolicyLayer and every tool call is checked against your policy before it runs — allow, deny, or require approval. Per-identity grants. Full audit log. Live in minutes.

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