Gets details of a specific phone number
AI agents call get_phone_number to retrieve information from Vapi MCP Server 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 existing phone number information without modifying, deleting, or executing any operations. It is a straightforward read operation that has minimal blast radius if misused by an AI agent.
From the tool's definition Tool name 'get_phone_number' and description 'Gets details of a specific phone number' indicate a retrieval operation with no side effects.
Attacks that exploit this kind of access
Gets details of a specific phone number. It is categorised as a Read tool in the Vapi MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Vapi MCP Server MCP server in PolicyLayer and add a rule for get_phone_number: 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 Vapi MCP Server. Nothing to install.
get_phone_number 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_number 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_number. 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_number is provided by the Vapi MCP Server MCP server (kuchikirenji/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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