send_template_message · Wati MCP: Risk & Policy

WHAT IT DOES

What send_template_message does on Wati

AI agents use send_template_message 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_message needs a policy

Sending template messages is a Write operation—it creates new message records and modifies conversation state in WATI's system, but is reversible (messages can be deleted/retracted). It has medium severity because widespread misuse could spam contacts or disrupt communications, but lacks the financial impact of a payment tool or irreversibility of deletion.

From the tool's definition Tool name 'send_template_message' and sibling tools like 'send_message_to_opened_session' and 'send_template_messages' indicate this sends WhatsApp messages. The server description states it enables 'send messages'.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

send_template_message Rate-limited

send_template_message 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_message": {
      "limits": [
        {
          "counter": "send_template_message_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 Wati, so you can run agents against it safely.

FAQ

Questions about send_template_message

What does the send_template_message tool do? +

send_template_message. 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_message? +

Register the Wati MCP server in PolicyLayer and add a rule for send_template_message: 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_message? +

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

Can I rate-limit send_template_message? +

Yes. Add a rate_limit block to the send_template_message 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_message completely? +

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

send_template_message 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.