send_facebook_message

THE RISK

Medium Risk

Why send_facebook_message needs a policy

This tool creates new data (a message) in Facebook Messenger, which is reversible (messages can be deleted). It does not execute arbitrary code, destroy data irreversibly, or move money. However, in the context of an AFIP (Argentine tax authority) server, sending unsolicited or fraudulent messages to taxpayers could cause reputational or operational harm, warranting medium severity.

From the tool's definition Tool name 'send_facebook_message' and description 'Send a Facebook Messenger message' indicate creation of a message (Write). The tool modifies state by creating a new message in an external system (Facebook Messenger).

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

POLICY

How to control send_facebook_message

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_facebook_message:

policy.json

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

send_facebook_message 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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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_facebook_message

What does the send_facebook_message tool do? +

Send a Facebook Messenger message. 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_facebook_message? +

Register the Mcp Afip MCP server in PolicyLayer and add a rule for send_facebook_message: 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_facebook_message? +

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

Can I rate-limit send_facebook_message? +

Yes. Add a rate_limit block to the send_facebook_message 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_facebook_message completely? +

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

send_facebook_message 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 →