list_lists

THE RISK

Low Risk

Why list_lists needs a policy

This tool retrieves metadata about marketing campaign contact lists without modifying, deleting, or executing any operations. It performs a straightforward query operation that returns information about existing lists. The pagination support further confirms this is a data retrieval utility. No financial transactions, code execution, or destructive actions are involved.

From the tool's definition Tool description explicitly states 'List all Marketing Campaigns contact lists via GET' and 'Returns list UUIDs, names, and contact_count.' The GET HTTP method and 'List' operation confirm read-only retrieval with no side effects.

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

POLICY

How to control list_lists

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_lists:

policy.json

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

list_lists 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.

CAP 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.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about list_lists

What does the list_lists tool do? +

List all Marketing Campaigns contact lists via GET /marketing/lists. Returns list UUIDs, names, and contact_count. Supports pagination. 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_lists? +

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

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

Can I rate-limit list_lists? +

Yes. Add a rate_limit block to the list_lists 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_lists completely? +

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

list_lists 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 →