create_item

THE RISK

Medium Risk

Why create_item needs a policy

This tool creates a new item (product/service) in QuickBooks Online, which is a reversible write operation. It modifies the accounting system's data but does not execute arbitrary code, delete data, or move money. The medium severity reflects that misuse could pollute the chart of accounts or inventory, but the change can be undone by deleting the item.

From the tool's definition Tool name is 'create_item' and description states 'Create an item in QuickBooks Online.' The verb 'create' indicates data creation/modification without deletion.

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

POLICY

How to control create_item

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

policy.json

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

create_item 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 QuickBooks Online 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 QuickBooks Online MCP Server tools

Financial create_bill_payment Create a bill payment in QuickBooks Online. Links a payment to one or more bills. Financial create_purchase Create a purchase (expense/check/credit card charge) in QuickBooks Online. Destructive delete_account Delete (make inactive) a chart-of-accounts entry in QuickBooks Online. Destructive delete_bill Delete a bill in QuickBooks Online. Destructive delete_bill_payment Delete a bill payment in QuickBooks Online. Destructive delete_customer Delete (make inactive) a customer in QuickBooks Online. Destructive delete_employee Delete (make inactive) an employee in QuickBooks Online. Destructive delete_estimate Delete an estimate in QuickBooks Online.

All 55 QuickBooks Online MCP Server tools →

Write tools on other servers

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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 create_item

What does the create_item tool do? +

Create an item in QuickBooks Online. It is categorised as a Write tool in the QuickBooks Online 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 create_item? +

Register the QuickBooks Online MCP Server MCP server in PolicyLayer and add a rule for create_item: 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 QuickBooks Online MCP Server. Nothing to install.

What risk level is create_item? +

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

Can I rate-limit create_item? +

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

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

create_item is provided by the QuickBooks Online MCP Server MCP server (librechat-ai/quickbooks-online-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every QuickBooks Online MCP Server tool call.

Start from QuickBooks Online 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 →