waha_get_group_join_info

THE RISK

Low Risk

Why waha_get_group_join_info needs a policy

This tool retrieves group metadata from a WhatsApp invite link without performing any action that modifies state, sends messages, joins groups, or affects data. It is a pure read operation with minimal security impact—the information being queried is already publicly accessible via the invite link itself.

From the tool's definition Tool name 'waha_get_group_join_info' and description 'Get group information from invite link without joining' indicate data retrieval only. The word 'Get' and 'without joining' confirm no side effects or state changes.

Documented attack patterns abuse exactly the kind of access waha_get_group_join_info gives an agent:

POLICY

How to control waha_get_group_join_info

PolicyLayer is an MCP gateway — it sits between your AI agents and WAHA MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for waha_get_group_join_info:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "waha_get_group_join_info": {}
  }
}

waha_get_group_join_info is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register WAHA MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

Related tools and policies

More WAHA MCP Server tools

Destructive waha_clear_chat_messages Clear all messages from a chat. WARNING: This is a destructive operation that cannot be un Destructive waha_delete_chat Delete a chat completely. WARNING: This is a destructive operation that cannot be undone. Destructive waha_delete_group_picture Remove group profile picture. Destructive waha_delete_message Delete a specific message from a chat. This is a destructive operation and cannot be undon Destructive waha_remove_group_participants Remove member(s) from a group. Requires admin privileges. Destructive waha_leave_group Leave a group. Execute waha_revoke_group_invite_code Revoke current invite link and generate a new one. Requires admin privileges. Write waha_demote_group_admin Remove admin privileges from participant(s). Requires admin privileges.

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about waha_get_group_join_info

What does the waha_get_group_join_info tool do? +

Get group information from invite link without joining. It is categorised as a Read tool in the WAHA MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on waha_get_group_join_info? +

Register the WAHA MCP Server MCP server in PolicyLayer and add a rule for waha_get_group_join_info: 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 WAHA MCP Server. Nothing to install.

What risk level is waha_get_group_join_info? +

waha_get_group_join_info is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit waha_get_group_join_info? +

Yes. Add a rate_limit block to the waha_get_group_join_info 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.

How do I block waha_get_group_join_info completely? +

Set action: deny in the PolicyLayer policy for waha_get_group_join_info. 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.

What MCP server provides waha_get_group_join_info? +

waha_get_group_join_info is provided by the WAHA MCP Server MCP server (seejux/waha-whatsapp-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every WAHA MCP Server tool call.

Start from WAHA 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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