send_button_list

THE RISK

Medium Risk

Why send_button_list needs a policy

This tool creates and transmits a new message object to WhatsApp, which is a reversible write operation. While messaging is typically low-risk in isolation, the AFIP context (Argentine tax authority) suggests these may be official tax communications sent to citizens or businesses.

From the tool's definition Tool name 'send_button_list' and description 'Send a button list message via WhatsApp' indicate creation of outbound messages.

Documented attack patterns abuse exactly the kind of access send_button_list gives an agent:

POLICY

How to control send_button_list

PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Afip, and nothing reaches the server without passing your rules. This is the rule we recommend for send_button_list:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "send_button_list": {
      "limits": [
        {
          "counter": "send_button_list_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

send_button_list 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.

Create a free account and register Mcp Afip — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about send_button_list

What does the send_button_list tool do? +

Send a button list message via WhatsApp. It is categorised as a Write tool in the Mcp Afip 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_button_list? +

Register the Mcp Afip MCP server in PolicyLayer and add a rule for send_button_list: 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 Mcp Afip. Nothing to install.

What risk level is send_button_list? +

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

Can I rate-limit send_button_list? +

Yes. Add a rate_limit block to the send_button_list 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_button_list completely? +

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

send_button_list is provided by the Mcp Afip MCP server (codespar/mcp-dev-latam). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Mcp Afip tool call.

Start from Mcp Afip, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →