add_to_cart · Rohlik MCP: Risk & Policy

WHAT IT DOES

What add_to_cart does on Rohlik

AI agents use add_to_cart to create or update resources in Rohlik — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Rohlik environment.

PARAMETERS

Parameter	Type	Required	Description
`products`	array	Yes	Array of products to add to cart

Parameters from the server's own tool schema.

WHY IT NEEDS A POLICY

Why add_to_cart needs a policy

The tool modifies user cart data reversibly. While it doesn't execute arbitrary code or delete data permanently, it does alter the user's shopping state and could lead to unwanted purchases if misused by an agent. Severity is medium rather than high because: (1) changes are reversible before purchase, (2) no financial transaction occurs until checkout, and (3) the user retains control.

From the tool's definition Tool name 'add_to_cart' and description 'Add products to the shopping cart' directly indicate creation/modification of cart state. This is a reversible write operation—items can be removed from the cart before checkout.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_to_cart Rate-limited

add_to_cart stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "add_to_cart": {
      "limits": [
        {
          "counter": "add_to_cart_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Rohlik, so you can run agents against it safely.

FAQ

Questions about add_to_cart

What does the add_to_cart tool do? +

Add products to the shopping cart. It is categorised as a Write tool in the Rohlik MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

What parameters does add_to_cart accept? +

add_to_cart accepts 1 parameter: products. Required: products. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on add_to_cart? +

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

What risk level is add_to_cart? +

add_to_cart is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit add_to_cart? +

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

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

add_to_cart is provided by the Rohlik MCP server (@tomaspavlin/rohlik-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.