Changes the quantity of a product already in the cart (partial name match supported).
AI agents use update_item_quantity to create or update resources in Frisco MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Frisco MCP environment.
The tool modifies cart contents by adjusting quantities, which is a reversible state change. It does not execute external code, delete data irreversibly, or move money. While it operates in a shopping context, the actual operation is data modification (write).
From the tool's definition Tool description states it 'Changes the quantity of a product already in the cart', which modifies cart state reversibly. This is a write operation comparable to sibling tools like 'add_items_to_cart' and 'remove_item_from_cart'.
Documented attack patterns abuse exactly the kind of access update_item_quantity gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Frisco MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for update_item_quantity:
{
"version": "1",
"default": "deny",
"tools": {
"update_item_quantity": {
"limits": [
{
"counter": "update_item_quantity_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}update_item_quantity 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.
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Changes the quantity of a product already in the cart (partial name match supported). It is categorised as a Write tool in the Frisco MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Frisco MCP server in PolicyLayer and add a rule for update_item_quantity: 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 Frisco MCP. Nothing to install.
update_item_quantity 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 update_item_quantity 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 update_item_quantity. 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.
update_item_quantity is provided by the Frisco MCP server (mkidawa/frisco-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Frisco MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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15 Frisco MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.