add_suppression

THE RISK

Medium Risk

Why add_suppression needs a policy

The tool creates/modifies a suppression group by adding email addresses, which blocks future communications. This is a reversible write operation: addresses can be removed from suppression lists. While it affects business communication flow, it does not delete permanent data, execute code, or move money.

From the tool's definition add_suppression via POST /asm/groups/{group_id}/suppressions; description states 'Add recipients to a suppression group' and 'Future mail in this group will be blocked for these addresses.' This is a POST operation that modifies suppression list state.

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

POLICY

How to control add_suppression

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 add_suppression:

policy.json

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

add_suppression 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.

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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 add_suppression

What does the add_suppression tool do? +

Add recipients to a suppression group via POST /asm/groups/{group_id}/suppressions. Future mail in this group will be blocked for these addresses. 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 add_suppression? +

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

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

Can I rate-limit add_suppression? +

Yes. Add a rate_limit block to the add_suppression 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 add_suppression completely? +

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

add_suppression 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 →