send_whatsapp_message

Send a WhatsApp message from one of the brand’s registered numbers to a customer. TWO KINDS, and which one is legal depends on time: pass

SERVERHermoso SOURCEhttps://app.hermoso.ai/mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade D, identity unverified Pull the record →

This record as markdown: /tools/hermoso/send-whatsapp-message.md

WHAT IT DOES

What send_whatsapp_message does on Hermoso

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

RISK

Why send_whatsapp_message is rated Medium

An AI agent can call send_whatsapp_message faster than any human can review: one bad instruction and it creates or modifies resources in Hermoso by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs send_whatsapp_message safely

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

send_whatsapp_message Rate-limited

send_whatsapp_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_whatsapp_message": {
      "limits": [
        {
          "counter": "send_whatsapp_message_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 Hermoso, apply this rule, and every send_whatsapp_message call is checked against it from then on.

FAQ

Questions about send_whatsapp_message

What does the send_whatsapp_message tool do? +

Send a WhatsApp message from one of the brand’s registered numbers to a customer. TWO KINDS, and which one is legal depends on time: pass. It is categorised as a Write tool in the Hermoso 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_whatsapp_message? +

Register the Hermoso MCP server in PolicyLayer and add a rule for send_whatsapp_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 Hermoso. Nothing to install.

What risk level is send_whatsapp_message? +

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

Can I rate-limit send_whatsapp_message? +

Yes. Add a rate_limit block to the send_whatsapp_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_whatsapp_message completely? +

Set action: deny in the PolicyLayer policy for send_whatsapp_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_whatsapp_message? +

send_whatsapp_message is provided by the Hermoso MCP server (https://app.hermoso.ai/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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