list_variants_for_product

THE RISK

Low Risk

Why list_variants_for_product needs a policy

This tool queries and retrieves product variant data (SKUs, prices, inventory quantities) without creating, modifying, deleting, or executing any operations. It is a pure data retrieval function typical of catalog queries in e-commerce systems.

From the tool's definition Tool description explicitly states 'List all variants' and 'Returns paginated results', indicating a retrieval operation with no side effects. No modification, deletion, or execution is mentioned.

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

POLICY

How to control list_variants_for_product

PolicyLayer is an MCP gateway — it sits between your AI agents and Sapo, and nothing reaches the server without passing your rules. This is the rule we recommend for list_variants_for_product:

policy.json

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

list_variants_for_product 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 Sapo — 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.
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_variants_for_product

What does the list_variants_for_product tool do? +

List all variants for a product (SKUs, prices in VND, inventory quantities). Returns paginated results via since_id cursor. It is categorised as a Read tool in the Sapo MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_variants_for_product? +

Register the Sapo MCP server in PolicyLayer and add a rule for list_variants_for_product: 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 Sapo. Nothing to install.

What risk level is list_variants_for_product? +

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

Can I rate-limit list_variants_for_product? +

Yes. Add a rate_limit block to the list_variants_for_product 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_variants_for_product completely? +

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

list_variants_for_product is provided by the Sapo MCP server (nguyennguyenit/sapo-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Sapo tool call.

Start from Sapo, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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