add_participants · Evolution API WhatsApp MCP Server MCP

WHAT IT DOES

What add_participants does on Evolution API WhatsApp MCP Server

AI agents use add_participants to create or update resources in Evolution API WhatsApp MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Evolution API WhatsApp MCP Server environment.

WHY IT NEEDS A POLICY

Why add_participants needs a policy

This is classified as Write rather than Execute because it modifies group membership data without executing arbitrary code or commands. The severity is high because unauthorized group membership changes could enable spam distribution, harassment campaigns, or unauthorized access to group conversations affecting multiple recipients.

From the tool's definition The tool 'add_participants' performs a group modification action by adding participants to a WhatsApp group. The description explicitly states it adds participants, which is a reversible data modification operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_participants Rate-limited

add_participants 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": {
    "add_participants": {
      "limits": [
        {
          "counter": "add_participants_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Evolution API WhatsApp MCP Server, so you can run agents against it safely.

FAQ

Questions about add_participants

What does the add_participants tool do? +

Add participants to a group. It is categorised as a Write tool in the Evolution API WhatsApp MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on add_participants? +

Register the Evolution API WhatsApp MCP Server MCP server in PolicyLayer and add a rule for add_participants: 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 Evolution API WhatsApp MCP Server. Nothing to install.

What risk level is add_participants? +

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

Can I rate-limit add_participants? +

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

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

add_participants is provided by the Evolution API WhatsApp MCP Server MCP server (luiso2/mcp-evolution-api). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.