send_media · WhatsApp MCP Stream MCP: Risk & Policy

WHAT IT DOES

What send_media does on WhatsApp MCP Stream

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

WHY IT NEEDS A POLICY

Why send_media needs a policy

This tool creates and sends new messages with media attachments to WhatsApp contacts or groups. While reversible in principle (messages can be deleted), the primary action is writing/creating new data (outbound messages) with moderate blast radius: an agent could spam contacts, send malicious files, or impersonate the user to damage relationships or reputation.

From the tool's definition Tool name 'send_media' and description 'Send media (image, video, document, audio) via WhatsApp' indicate creation and transmission of outbound messages through a messaging platform.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

send_media Rate-limited

send_media 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_media": {
      "limits": [
        {
          "counter": "send_media_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 WhatsApp MCP Stream, so you can run agents against it safely.

FAQ

Questions about send_media

What does the send_media tool do? +

Send media (image, video, document, audio) via WhatsApp. It is categorised as a Write tool in the WhatsApp MCP Stream 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_media? +

Register the WhatsApp MCP Stream MCP server in PolicyLayer and add a rule for send_media: 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 WhatsApp MCP Stream. Nothing to install.

What risk level is send_media? +

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

Can I rate-limit send_media? +

Yes. Add a rate_limit block to the send_media 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_media completely? +

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

send_media is provided by the WhatsApp MCP Stream MCP server (loglux/whatsapp-mcp-stream). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.