wa_send_audio

Send an audio file or voice note to a WhatsApp contact or group. Set ptt=true for voice note (push-to-talk).

SERVERWA MCP SOURCEdelltrak/wamcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/delltrak-wamcp/wa-send-audio.md

WHAT IT DOES

What wa_send_audio does on WA MCP

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

RISK

Why wa_send_audio is rated Medium

This tool creates and transmits new audio messages, which is a reversible write action. While it modifies the state of a chat (adds messages), it does not delete, destroy, or execute arbitrary code.

From the tool's definition Tool description states it 'Send[s] an audio file or voice note to a WhatsApp contact or group', which is a write operation that creates/sends new data to recipients.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs wa_send_audio safely

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

wa_send_audio Rate-limited

wa_send_audio 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": {
    "wa_send_audio": {
      "limits": [
        {
          "counter": "wa_send_audio_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 WA MCP, apply this rule, and every wa_send_audio call is checked against it from then on.

FAQ

Questions about wa_send_audio

What does the wa_send_audio tool do? +

Send an audio file or voice note to a WhatsApp contact or group. Set ptt=true for voice note (push-to-talk). It is categorised as a Write tool in the WA MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on wa_send_audio? +

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

What risk level is wa_send_audio? +

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

Can I rate-limit wa_send_audio? +

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

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

wa_send_audio is provided by the WA MCP server (delltrak/wamcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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