list_messages
AI agents call list_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 retrieves message data from a personal WhatsApp account without modifying or deleting it. However, severity is high because the blast radius of an AI agent misusing message access is significant—it could expose sensitive personal communications, private conversations, and confidential information.
From the tool's definition The tool is `list_messages` on a WhatsApp MCP server that 'allows them to search messages and contacts, retrieve chat history' with sibling tools including `get_chat`, `get_message_context`, and `search_messages`.
Attacks that exploit this kind of access
list_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 list_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.
list_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 list_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 list_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.
list_messages is provided by the WhatsApp MCP Server MCP server (joshnaacsha/mcp-shipathon). 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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