AI agents call twilio_list_messages to retrieve information from UnClick without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
to | string | — | |
from | string | — | |
date_sent | string | — | Filter by date (YYYY-MM-DD) |
page_size | number | — | |
auth_token | string | Yes | |
account_sid | string | Yes |
Parameters from the server's own tool schema.
This tool retrieves and queries message history from a Twilio account without modifying or deleting data. It is a Read operation. Severity is elevated to medium because SMS messages commonly contain sensitive information (OTPs, payment confirmations, personal data) that could be exfiltrated if an agent gains unauthorized access to this tool or the account credentials.
From the tool's definition Tool name contains 'list' and description states 'List SMS messages sent or received' — a retrieval operation with no modification or deletion. However, SMS messages may contain sensitive personal or financial information.
Attacks that exploit this kind of access
List SMS messages sent or received on a Twilio account. It is categorised as a Read tool in the UnClick MCP Server, which means it retrieves data without modifying state.
twilio_list_messages accepts 6 parameters: to, from, date_sent, page_size, auth_token, account_sid. Required: auth_token, account_sid. The full parameter table on this page comes from the server's own tool schema.
Register the UnClick MCP server in PolicyLayer and add a rule for twilio_list_messages: 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 UnClick. Nothing to install.
twilio_list_messages is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the twilio_list_messages 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.
Set action: deny in the PolicyLayer policy for twilio_list_messages. 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.
twilio_list_messages is provided by the UnClick MCP server (@unclick/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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