AI agents call get_messages to retrieve information from WhatsApp Web MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves WhatsApp messages without side effects. While the tool description is empty, the name and context of sibling read operations strongly indicate a query function. Confidence is slightly reduced due to missing description, but the naming convention and tool ecosystem make Read classification highly probable.
From the tool's definition Tool name 'get_messages' indicates data retrieval with no modification capability. Sibling tools include 'get_chats', 'get_group_messages', 'get_group_by_id', and 'search_contacts'—all Read operations.
Documented attack patterns abuse exactly the kind of access get_messages gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and WhatsApp Web MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for get_messages:
{
"version": "1",
"default": "deny",
"tools": {
"get_messages": {}
}
}get_messages is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
get_messages. It is categorised as a Read tool in the WhatsApp Web MCP MCP Server, which means it retrieves data without modifying state.
Register the WhatsApp Web MCP server in PolicyLayer and add a rule for get_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 Web MCP. Nothing to install.
get_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 get_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 get_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.
get_messages is provided by the WhatsApp Web MCP server (pnizer/wweb-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 13 WhatsApp Web MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
13 WhatsApp Web MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.