sms_lookup_number

A read tool on the Twilio SMS MCP server.

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

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

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

WHAT IT DOES

What sms_lookup_number does on Twilio SMS MCP Server

AI agents call sms_lookup_number to retrieve information from Twilio SMS MCP Server without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why sms_lookup_number is rated Low

Based on naming convention and server context, this tool likely performs a phone number lookup or validation—a read-only query with no data modification or execution side effects. The empty description reduces confidence slightly, but the consistent pattern of read tools on this Twilio SMS server and the lookup verb (not send, delete, execute, or modify) strongly suggest a Read category.

From the tool's definition Tool name 'sms_lookup_number' suggests querying phone number information. No description provided, but the sibling tools on this server (sms_get_message, sms_list_inbox, sms_list_sent, sms_get_conversation) are all read operations, establishing a pattern of…

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs sms_lookup_number 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_lookup_number, this is the rule to start with:

sms_lookup_number Allowed

sms_lookup_number is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "sms_lookup_number": {}
  }
}

ALLOW ONLY 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_lookup_number call is checked against it from then on.

FAQ

Questions about sms_lookup_number

What does the sms_lookup_number tool do? +

sms_lookup_number is a read tool on the Twilio SMS MCP Server MCP server. It is categorised as a Read tool in the Twilio SMS MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on sms_lookup_number? +

Register the Twilio SMS MCP Server MCP server in PolicyLayer and add a rule for sms_lookup_number: 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_lookup_number? +

sms_lookup_number is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit sms_lookup_number? +

Yes. Add a rate_limit block to the sms_lookup_number 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_lookup_number completely? +

Set action: deny in the PolicyLayer policy for sms_lookup_number. 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_lookup_number? +

sms_lookup_number 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.

KEEP EXPLORING

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