customize_item · Mcp Starbucks MCP: Risk & Policy

WHAT IT DOES

What customize_item does on Mcp Starbucks

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

WHY IT NEEDS A POLICY

Why customize_item needs a policy

This tool constructs a customized item configuration in preparation for adding to a cart. It creates/modifies an order item reversibly (before checkout), making it a Write operation. It does not itself place an order or move money, but it is a precursor step in a financial workflow. Severity is medium because misuse could lead to unwanted items being added to cart, though it doesn't finalize any purchase on its own.

From the tool's definition 'Build a customized drink or food order. Specify the item and your customization choices. Call add_to_cart afterwards to add it to your cart.'

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

customize_item Rate-limited

customize_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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "customize_item": {
      "limits": [
        {
          "counter": "customize_item_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 Mcp Starbucks, so you can run agents against it safely.

FAQ

Questions about customize_item

What does the customize_item tool do? +

Build a customized drink or food order. Specify the item and your customization choices. Call add_to_cart afterwards to add it to your cart. It is categorised as a Write tool in the Mcp Starbucks MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on customize_item? +

Register the Mcp Starbucks MCP server in PolicyLayer and add a rule for customize_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 Mcp Starbucks. Nothing to install.

What risk level is customize_item? +

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

Can I rate-limit customize_item? +

Yes. Add a rate_limit block to the customize_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 customize_item completely? +

Set action: deny in the PolicyLayer policy for customize_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 customize_item? +

customize_item is provided by the Mcp Starbucks MCP server (markswendsen-code/mcp-starbucks). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.