AI agents call search_groups 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 appears to search or query groups within WhatsApp Web, returning matching results without modifying or deleting data. It fits the Read category (retrieves or queries data; no side effects). Severity is low because group metadata retrieval poses minimal risk even if misused by an AI agent—it exposes user's group associations but causes no destructive or financial harm.
From the tool's definition Tool name 'search_groups' follows the read-pattern established by sibling tools like 'search_contacts', 'get_chats', 'get_messages', and 'get_group_messages', all of which are retrieval operations.
Documented attack patterns abuse exactly the kind of access search_groups 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 search_groups:
{
"version": "1",
"default": "deny",
"tools": {
"search_groups": {}
}
}search_groups is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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search_groups. 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 search_groups: 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.
search_groups 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_groups 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_groups. 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_groups 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.
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13 WhatsApp Web MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.