AI agents call get_phone_numbers to retrieve information from Oitvoip without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves phone number data associated with a domain in the NetSapiens VoIP platform. It performs a read-only operation with no side effects, no code execution, no data modification, and no destructive capabilities. The blast radius of misuse is minimal—an agent could retrieve phone numbers it shouldn't access, but cannot modify, delete, or execute actions with them.
From the tool's definition Tool name 'get_phone_numbers' and description 'Get phone numbers for a domain' indicate a retrieval operation with no modification or destructive action.
Attacks that exploit this kind of access
Get phone numbers for a domain. It is categorised as a Read tool in the Oitvoip MCP Server, which means it retrieves data without modifying state.
Register the Oitvoip MCP server in PolicyLayer and add a rule for get_phone_numbers: 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 Oitvoip. Nothing to install.
get_phone_numbers 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 get_phone_numbers 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 get_phone_numbers. 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.
get_phone_numbers is provided by the Oitvoip MCP server (oitapps/oitvoip-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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