send_message_with_list · PyWA MCP Server MCP: Risk & Policy

WHAT IT DOES

What send_message_with_list does on PyWA MCP Server

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

WHY IT NEEDS A POLICY

Why send_message_with_list needs a policy

This tool creates and sends WhatsApp messages with list interactions, which modifies state in the WhatsApp messaging system. It's reversible (messages can be deleted), so it's Write rather than Destructive. Severity is high because misuse could enable spam, phishing, or unauthorized mass messaging campaigns that impact many recipients, but no financial or data destruction occurs.

From the tool's definition Tool name 'send_message_with_list' combined with server description stating it 'Provides comprehensive WhatsApp Business API functionality' for 'sending messages' via PyWA library.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

send_message_with_list Rate-limited

send_message_with_list 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": {
    "send_message_with_list": {
      "limits": [
        {
          "counter": "send_message_with_list_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 PyWA MCP Server, so you can run agents against it safely.

FAQ

Questions about send_message_with_list

What does the send_message_with_list tool do? +

send_message_with_list. It is categorised as a Write tool in the PyWA 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 send_message_with_list? +

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

What risk level is send_message_with_list? +

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

Can I rate-limit send_message_with_list? +

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

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

send_message_with_list is provided by the PyWA MCP Server MCP server (jem-hr/pywa-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.