get_variant

THE RISK

Low Risk

Why get_variant needs a policy

This tool retrieves product variant information (price, SKU, barcode, inventory quantity, option values) by ID without creating, modifying, deleting, or executing any operations. It is a straightforward read operation with minimal security risk.

From the tool's definition Tool name 'get_variant' and description 'Get a single product variant by ID. Returns price...inventory quantity, and option values.' indicates data retrieval with no modification or side effects.

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

POLICY

How to control get_variant

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 get_variant:

policy.json

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

get_variant 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.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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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 get_variant

What does the get_variant tool do? +

Get a single product variant by ID. Returns price (VND, float with 4 decimals), SKU, barcode, inventory quantity, and option values. 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 get_variant? +

Register the Sapo MCP server in PolicyLayer and add a rule for get_variant: 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 get_variant? +

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

Can I rate-limit get_variant? +

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

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

get_variant 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.

CHECK YOUR STACK →