send_audio · PyWA MCP Server MCP: Risk & Policy

WHAT IT DOES

What send_audio does on PyWA MCP Server

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

WHY IT NEEDS A POLICY

Why send_audio needs a policy

Sending audio messages is a Write operation: it creates and transmits data (audio content) to WhatsApp users, causing state changes in the messaging system. It is reversible (messages can be deleted) and has no permanent data destruction. Severity is medium because misuse could spam users or send unwanted audio content, but lacks the financial impact of payment tools or the irreversible nature of data deletion.

From the tool's definition Tool name 'send_audio' combined with server description stating it 'provides...functionality with...tools for sending messages, media' indicates the tool creates and transmits audio content through WhatsApp Business API.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

send_audio Rate-limited

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": {
    "send_audio": {
      "limits": [
        {
          "counter": "send_audio_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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

FAQ

Questions about send_audio

What does the send_audio tool do? +

Send an audio message. It is categorised as a Write tool in the PyWA 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 send_audio? +

Register the PyWA MCP Server MCP server in PolicyLayer and add a rule for 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 PyWA MCP Server. Nothing to install.

What risk level is send_audio? +

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

Can I rate-limit send_audio? +

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

Set action: deny in the PolicyLayer policy for 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 send_audio? +

send_audio is provided by the PyWA MCP Server MCP server (jem-hr/pywa-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.