send_rcs

THE RISK

Medium Risk

Why send_rcs needs a policy

Sending an RCS message creates/transmits new data (the message itself) but does not delete, modify existing records, execute code, trigger financial transactions, or cause irreversible changes. It is a reversible write operation that sends communication.

From the tool's definition Tool name 'send_rcs' and description 'Send an RCS (Rich Communication Services) message' indicate creation and transmission of communication data.

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

POLICY

How to control send_rcs

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_rcs:

policy.json

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

send_rcs 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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All 1300 Mcp Afip tools →

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_rcs

What does the send_rcs tool do? +

Send an RCS (Rich Communication Services) 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_rcs? +

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

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

Can I rate-limit send_rcs? +

Yes. Add a rate_limit block to the send_rcs 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_rcs completely? +

Set action: deny in the PolicyLayer policy for send_rcs. 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_rcs? +

send_rcs 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 →