add_to_cart

THE RISK

Medium Risk

Why add_to_cart needs a policy

This tool creates or modifies data (adding items to a cart) in a reversible manner. While the action itself is not destructive—items can be removed—it does commit the user to cart state changes and could lead to unintended purchases if an AI agent misuses it without proper safeguards.

From the tool's definition The tool is described as 'Add a product to Amazon cart', which creates/modifies shopping cart data. The server uses 'browser automation' to interact with Amazon accounts.

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

POLICY

How to control add_to_cart

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

policy.json

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

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.

Create a free account and register Amazon Cart MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Amazon Cart MCP Server tools

Write add_to_wholefoods_cart Add a grocery product to the Whole Foods / Amazon Fresh cart. Use this instead of add_to_c Write save_session (Optional) Manually trigger session save. Sessions are automatically saved periodically, a Read check_login Check if logged into Amazon Read search_amazon Search for products on Amazon Read search_wholefoods Search for grocery products on Whole Foods Market via Amazon. Results are scoped to items Read view_cart View current Amazon cart contents Read view_wholefoods_cart View the current Whole Foods / Amazon Fresh grocery cart contents and subtotal.

All 8 Amazon Cart MCP Server tools →

Write tools on other servers

M-Team MCP Server download_torrent YouTube MCP Server generate_video_title Android Forensics ADB MCP Server combine_reports 0xarchive web3_signup

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about add_to_cart

What does the add_to_cart tool do? +

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

How do I enforce a policy on add_to_cart? +

Register the Amazon Cart MCP Server 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 Amazon Cart MCP Server. 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 Amazon Cart MCP Server MCP server (madebydia/amazon-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Amazon Cart MCP Server tool call.

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

CHECK YOUR STACK →