whatsapp_send_voice · WSAPI WhatsApp MCP Server MCP

WHAT IT DOES

What whatsapp_send_voice does on WSAPI WhatsApp MCP Server

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

WHY IT NEEDS A POLICY

Why whatsapp_send_voice needs a policy

This tool creates new voice messages and transmits them through WhatsApp, which is a reversible write operation. While not destructive (messages can be deleted), not financial, and not raw code execution, it does create and modify communication state.

From the tool's definition Tool description states 'Send a voice message (PTT)' — this creates and transmits new data (a voice message) to WhatsApp contacts or groups.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

whatsapp_send_voice Rate-limited

whatsapp_send_voice 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": {
    "whatsapp_send_voice": {
      "limits": [
        {
          "counter": "whatsapp_send_voice_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 WSAPI WhatsApp MCP Server, so you can run agents against it safely.

FAQ

Questions about whatsapp_send_voice

What does the whatsapp_send_voice tool do? +

Send a voice message (PTT). Provide either data (base64) or url. It is categorised as a Write tool in the WSAPI 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 whatsapp_send_voice? +

Register the WSAPI WhatsApp MCP Server MCP server in PolicyLayer and add a rule for whatsapp_send_voice: 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 WSAPI WhatsApp MCP Server. Nothing to install.

What risk level is whatsapp_send_voice? +

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

Can I rate-limit whatsapp_send_voice? +

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

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

whatsapp_send_voice is provided by the WSAPI WhatsApp MCP Server MCP server (wsapi-chat/wsapi-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.