AI agents call search_messages 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 searches/queries message data with no indication of modification or deletion. However, severity is medium rather than low because (1) WhatsApp messages often contain sensitive personal, financial, or authentication-related information; (2) an AI agent with unrestricted search access could exfiltrate private conversations; (3) the tool operates on a personal account with access to all user contacts and…
From the tool's definition Tool name 'search_messages' indicates retrieval/query operation. Server description states it 'retrieve[s] chat history' and 'search messages'.
Documented attack patterns abuse exactly the kind of access search_messages 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_messages:
{
"version": "1",
"default": "deny",
"tools": {
"search_messages": {}
}
}search_messages is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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search_messages. 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_messages: 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_messages 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_messages 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_messages. 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_messages 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.