AI agents call twilio_list_calls 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 | — | |
status | string | — | queued, ringing, in-progress, completed, failed, busy, no-answer |
page_size | number | — | |
auth_token | string | Yes | |
account_sid | string | Yes |
Parameters from the server's own tool schema.
The tool queries and retrieves call history data from a Twilio account without side effects. This is a Read operation. Severity is medium rather than low because call logs contain sensitive personal information (phone numbers, call duration, timestamps, identities) that could be exfiltrated if an AI agent gains unauthorized access to another user's Twilio account.
From the tool's definition Tool description states 'List outbound and inbound calls on a Twilio account' — this is a retrieval operation with no modification or deletion of data.
Attacks that exploit this kind of access
List outbound and inbound calls 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_calls accepts 6 parameters: to, from, status, 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_calls: 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_calls 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_calls 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_calls. 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_calls 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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