List all phone numbers registered under the WhatsApp Business Account, including display name, quality rating, and verification status.
AI agents call list_phone_numbers to retrieve information from Mcp Ap2 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 from a WhatsApp Business Account. It performs a read-only operation that retrieves or lists data without creating, modifying, deleting, executing code, or involving financial transactions. The blast radius of misuse is limited to exposure of phone number metadata associated with the account, which constitutes a low severity information disclosure risk.
From the tool's definition Tool name is 'list_phone_numbers' and description states it 'List[s] all phone numbers' — a retrieval operation with no modification of data. Returns metadata (display name, quality rating, verification status) without side effects.
Documented attack patterns abuse exactly the kind of access list_phone_numbers gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Ap2, and nothing reaches the server without passing your rules. This is the rule we recommend for list_phone_numbers:
{
"version": "1",
"default": "deny",
"tools": {
"list_phone_numbers": {}
}
}list_phone_numbers is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all phone numbers registered under the WhatsApp Business Account, including display name, quality rating, and verification status. It is categorised as a Read tool in the Mcp Ap2 MCP Server, which means it retrieves data without modifying state.
Register the Mcp Ap2 MCP server in PolicyLayer and add a rule for list_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 Mcp Ap2. Nothing to install.
list_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 list_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 list_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.
list_phone_numbers is provided by the Mcp Ap2 MCP server (@codespar/mcp-ap2). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Mcp Ap2, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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1300 Mcp Ap2 tools catalogued and risk-classified — across an index of 43,000+ MCP servers.