wa_group_join

Join a WhatsApp group using an invite code or link.

SERVERWA MCP SOURCEdelltrak/wamcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/delltrak-wamcp/wa-group-join.md

WHAT IT DOES

What wa_group_join does on WA MCP

AI agents use wa_group_join to create or update resources in WA MCP, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your WA MCP environment.

RISK

Why wa_group_join is rated Medium

This tool modifies data (group membership list) by adding the connected account to a group, which is a Write-category action. It does not read-only, execute external code, delete data irreversibly, or involve financial transactions.

From the tool's definition Tool performs 'Join a WhatsApp group' action that modifies agent's group memberships and potentially alters group metadata (adding a new participant). This is a state-changing operation that creates a new association but is reversible (can leave the group).

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs wa_group_join safely

PolicyLayer is an MCP gateway: it sits between your AI agents and WA MCP, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For wa_group_join, this is the rule to start with:

wa_group_join Rate-limited

wa_group_join stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "wa_group_join": {
      "limits": [
        {
          "counter": "wa_group_join_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect WA MCP, apply this rule, and every wa_group_join call is checked against it from then on.

FAQ

Questions about wa_group_join

What does the wa_group_join tool do? +

Join a WhatsApp group using an invite code or link. It is categorised as a Write tool in the WA MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on wa_group_join? +

Register the WA MCP server in PolicyLayer and add a rule for wa_group_join: 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 WA MCP. Nothing to install.

What risk level is wa_group_join? +

wa_group_join is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit wa_group_join? +

Yes. Add a rate_limit block to the wa_group_join 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 wa_group_join completely? +

Set action: deny in the PolicyLayer policy for wa_group_join. 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 wa_group_join? +

wa_group_join is provided by the WA MCP server (delltrak/wamcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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