AI agents call search_contacts to retrieve information from WhatsApp 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 from WhatsApp without modifying or deleting data. Contact data exposure carries medium severity due to privacy implications—an AI agent could extract personal contact lists, phone numbers, and associated metadata. However, it lacks the destructive or financial impact of higher categories. Confidence is slightly reduced (0.85 vs.
From the tool's definition Tool name 'search_contacts' indicates a search/query operation. Server description establishes the context: WhatsApp integration enabling AI agents to 'search messages, view contacts, retrieve chat history.' The sibling tools (get_chat, get_message_context,…
Documented attack patterns abuse exactly the kind of access search_contacts gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and WhatsApp MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for search_contacts:
{
"version": "1",
"default": "deny",
"tools": {
"search_contacts": {}
}
}search_contacts is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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search_contacts. It is categorised as a Read tool in the WhatsApp MCP Server MCP Server, which means it retrieves data without modifying state.
Register the WhatsApp MCP Server MCP server in PolicyLayer and add a rule for search_contacts: 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 WhatsApp MCP Server. Nothing to install.
search_contacts 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 search_contacts 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 search_contacts. 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.
search_contacts is provided by the WhatsApp MCP Server MCP server (jlucaso1/whatsapp-mcp-ts). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from WhatsApp MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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7 WhatsApp MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.