list_product_variants

THE RISK

Low Risk

Why list_product_variants needs a policy

This tool retrieves or queries product variant information without creating, modifying, deleting, or executing any operations. It is a straightforward data retrieval operation with no side effects, fitting the Read category. Severity is low because exposure of this data carries minimal risk in the context of an e-invoicing and tax authority system.

From the tool's definition Tool name 'list_product_variants' and description 'List variants of a product' indicate a retrieval operation with no modification or execution of external processes.

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

POLICY

How to control list_product_variants

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_product_variants:

policy.json

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

list_product_variants is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

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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_product_variants

What does the list_product_variants tool do? +

List variants of a product. 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_product_variants? +

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

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

Can I rate-limit list_product_variants? +

Yes. Add a rate_limit block to the list_product_variants 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_product_variants completely? +

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

list_product_variants 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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