AI agents call get_group_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 or queries existing group messages without modifying, deleting, or executing external operations. It is a read-only operation. Severity is medium rather than low because unauthorized access to group messages could expose private communications, potentially including sensitive personal or business information. The tool operates on WhatsApp data which often contains private conversations.
From the tool's definition Tool name 'get_group_messages' indicates retrieval of message data from groups. The sibling tools include other Read operations like 'get_chats', 'get_messages', and 'search_contacts', establishing a pattern of data retrieval within this server.
Documented attack patterns abuse exactly the kind of access get_group_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_group_messages:
{
"version": "1",
"default": "deny",
"tools": {
"get_group_messages": {}
}
}get_group_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_group_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_group_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_group_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_group_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_group_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_group_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.