send_template_messages · Wati MCP: Risk & Policy

WHAT IT DOES

What send_template_messages does on Wati

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

WHY IT NEEDS A POLICY

Why send_template_messages needs a policy

This tool creates and sends WhatsApp messages to contacts—a reversible action that modifies state (message records, contact communication history) but does not delete data or execute arbitrary code. It falls under Write category. Severity is medium because misuse could spam contacts, damage reputation, or incur messaging costs, but it's not destructive or financial in nature (the server doesn't handle payments).

From the tool's definition Tool name 'send_template_messages' indicates it sends messages via WhatsApp Business API. The sibling tool 'send_template_message' and context of 'send_message_to_opened_session' confirm this is a messaging/communication action.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

send_template_messages Rate-limited

send_template_messages 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_template_messages": {
      "limits": [
        {
          "counter": "send_template_messages_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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Instant setup, no code required.

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

FAQ

Questions about send_template_messages

What does the send_template_messages tool do? +

send_template_messages. It is categorised as a Write tool in the Wati 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_template_messages? +

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

What risk level is send_template_messages? +

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

Can I rate-limit send_template_messages? +

Yes. Add a rate_limit block to the send_template_messages 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_template_messages completely? +

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

send_template_messages is provided by the Wati MCP server (jairajmehra/wati_whatsapp_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.