sms_list_inbox

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-list-inbox.md

WHAT IT DOES

What sms_list_inbox does on Twilio SMS MCP Server

AI agents call sms_list_inbox 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_list_inbox is rated Low

The tool retrieves or lists SMS/MMS messages from an inbox without modifying or deleting them, placing it in the Read category. Severity is medium because inbox contents may contain sensitive personal or business information (phone numbers, message contents, metadata), and unauthorized access or exfiltration via an AI agent could impact privacy.

From the tool's definition Tool name 'sms_list_inbox' indicates retrieval of messages from an inbox; server description mentions 'real-time inbox monitoring' as a Read operation. No description provided for the specific tool.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs sms_list_inbox 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_list_inbox, this is the rule to start with:

sms_list_inbox Allowed

sms_list_inbox 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_list_inbox": {}
  }
}

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_list_inbox call is checked against it from then on.

FAQ

Questions about sms_list_inbox

What does the sms_list_inbox tool do? +

sms_list_inbox 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_list_inbox? +

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

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

Can I rate-limit sms_list_inbox? +

Yes. Add a rate_limit block to the sms_list_inbox 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_list_inbox completely? +

Set action: deny in the PolicyLayer policy for sms_list_inbox. 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_list_inbox? +

sms_list_inbox 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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