Use this when the user provides a specific phone number and wants to know who it belongs to:
AI agents call find_contact_by_phone to retrieve information from 3CX MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves contact information associated with a phone number. It performs a read-only lookup operation similar to searching or fetching data from the 3CX phone system directory. There is no indication of data creation, modification, deletion, code execution, or financial impact.
From the tool's definition Tool name 'find_contact_by_phone' and description 'Use this when the user provides a specific phone number and wants to know who it belongs to' indicate lookup/query functionality with no data modification or side effects.
Attacks that exploit this kind of access
Use this when the user provides a specific phone number and wants to know who it belongs to:. It is categorised as a Read tool in the 3CX MCP Server MCP Server, which means it retrieves data without modifying state.
Register the 3CX MCP Server MCP server in PolicyLayer and add a rule for find_contact_by_phone: 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 3CX MCP Server. Nothing to install.
find_contact_by_phone 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 find_contact_by_phone 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 find_contact_by_phone. 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.
find_contact_by_phone is provided by the 3CX MCP Server MCP server (ssig-it/3cx-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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