sms_send

A write tool on the Twilio SMS MCP server.

SERVERTwilio SMS MCP Server SOURCE0x-professor/twilio-mcp-server

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/0x-professor-twilio-mcp-server/sms-send.md

WHAT IT DOES

What sms_send does on Twilio SMS MCP Server

AI agents use sms_send to create or update resources in Twilio SMS MCP Server, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Twilio SMS MCP Server environment.

RISK

Why sms_send is rated Medium

The tool name 'sms_send' strongly implies it sends SMS/MMS messages via Twilio. Sending messages is a Write operation (creates outbound messages) with high severity because a misused AI agent could send bulk unsolicited messages to arbitrary recipients, causing reputational, legal, and financial harm.

From the tool's definition Tool name 'sms_send' on a server described as enabling agents to 'send, receive, schedule, and manage SMS and MMS messages using the Twilio Programmable Messaging API'

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs sms_send safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Twilio SMS MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For sms_send, this is the rule to start with:

sms_send Rate-limited

sms_send stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "sms_send": {
      "limits": [
        {
          "counter": "sms_send_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Twilio SMS MCP Server, apply this rule, and every sms_send call is checked against it from then on.

FAQ

Questions about sms_send

What does the sms_send tool do? +

sms_send is a write tool on the Twilio SMS MCP Server MCP server. It is categorised as a Write tool in the Twilio SMS MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on sms_send? +

Register the Twilio SMS MCP Server MCP server in PolicyLayer and add a rule for sms_send: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Twilio SMS MCP Server. Nothing to install.

What risk level is sms_send? +

sms_send is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit sms_send? +

Yes. Add a rate_limit block to the sms_send rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block sms_send completely? +

Set action: deny in the PolicyLayer policy for sms_send. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides sms_send? +

sms_send is provided by the Twilio SMS MCP Server MCP server (0x-professor/twilio-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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