list_suppressions

THE RISK

Low Risk

Why list_suppressions needs a policy

This is a straightforward query operation that retrieves data (suppressed email addresses) from an unsubscribe group without creating, modifying, deleting, or executing any actions. The GET method and read-only return of an email list confirm Read category with low severity, as exposure only permits viewing existing suppression data.

From the tool's definition Tool description explicitly states 'List all suppressed recipients' using a GET request, 'Returns an array of email strings'—a pure retrieval operation with no modification or side effects.

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

POLICY

How to control list_suppressions

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 list_suppressions:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "list_suppressions": {}
  }
}

list_suppressions is read-only, so it stays allowed — but 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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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
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FAQ

Questions about list_suppressions

What does the list_suppressions tool do? +

List all suppressed recipients for an unsubscribe group via GET /asm/groups/{group_id}/suppressions. Returns an array of email strings. It is categorised as a Read tool in the Mcp Afip MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_suppressions? +

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

list_suppressions is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit list_suppressions? +

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

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

list_suppressions 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.

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