send_sticker · PyWA MCP Server MCP: Risk & Policy

WHAT IT DOES

What send_sticker does on PyWA MCP Server

AI agents use send_sticker 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_sticker needs a policy

The tool sends a sticker (media content) to WhatsApp users, which is a write operation that creates/transmits data. While the description is empty, the naming pattern and server context (18 tools for sending messages/media) strongly indicate this creates new outbound communications.

From the tool's definition Tool named 'send_sticker' on WhatsApp Business API server; sibling tools include send_audio, send_image, send_document, send_location which are all message transmission tools.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

send_sticker Rate-limited

send_sticker 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_sticker": {
      "limits": [
        {
          "counter": "send_sticker_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 PyWA MCP Server, so you can run agents against it safely.

FAQ

Questions about send_sticker

What does the send_sticker tool do? +

send_sticker. 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_sticker? +

Register the PyWA MCP Server MCP server in PolicyLayer and add a rule for send_sticker: 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_sticker? +

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

Can I rate-limit send_sticker? +

Yes. Add a rate_limit block to the send_sticker 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_sticker completely? +

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

send_sticker 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.