Add products to Selver.ee guest cart by SKU. Creates a new cart if none exists. Server-side only - if a browser is open on selver.ee/cart, you must ALSO dispatch cart/addItem via chrome-devtools-mcp to keep the browser in sync (see README).
AI agents use add_to_cart to create or update resources in Selver — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Selver environment.
The tool modifies cart state by adding products, which is a Write operation. Severity is medium because misuse could result in unwanted items added to a cart (reversible via remove_from_cart), creating potential for user confusion or fraudulent cart manipulation, but does not directly process payment or destroy data.
From the tool's definition Tool description states 'Add products to Selver.ee guest cart' and 'Creates a new cart if none exists', which are reversible creation/modification operations on cart data.
Documented attack patterns abuse exactly the kind of access add_to_cart gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Selver, and nothing reaches the server without passing your rules. This is the rule we recommend for add_to_cart:
{
"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.
Free to start. No card required.
Add products to Selver.ee guest cart by SKU. Creates a new cart if none exists. Server-side only - if a browser is open on selver.ee/cart, you must ALSO dispatch cart/addItem via chrome-devtools-mcp to keep the browser in sync (see README). It is categorised as a Write tool in the Selver MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Selver 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 Selver. Nothing to install.
add_to_cart is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
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.
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.
add_to_cart is provided by the Selver MCP server (martparve/selver-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Selver, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
4 Selver tools catalogued and risk-classified — across an index of 43,000+ MCP servers.