add_shopping_item · Pantrist MCP: Risk & Policy

WHAT IT DOES

What add_shopping_item does on Pantrist

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

WHY IT NEEDS A POLICY

Why add_shopping_item needs a policy

This tool creates or adds data to the shopping list without deleting or executing arbitrary operations. The modification is reversible (items can be removed with delete_shopping_item). The blast radius of misuse is minimal — an attacker could add unwanted items to a shopping list, causing minor inconvenience but no financial loss, data destruction, or external command execution.

From the tool's definition Tool name is 'add_shopping_item' and description states 'Add an item to the shopping list' — this creates a new entry in the shopping list, which is a reversible modification of data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_shopping_item Rate-limited

add_shopping_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": {
    "add_shopping_item": {
      "limits": [
        {
          "counter": "add_shopping_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 Pantrist, so you can run agents against it safely.

FAQ

Questions about add_shopping_item

What does the add_shopping_item tool do? +

Add an item to the shopping list by name. The API matches. It is categorised as a Write tool in the Pantrist 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_shopping_item? +

Register the Pantrist MCP server in PolicyLayer and add a rule for add_shopping_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 Pantrist. Nothing to install.

What risk level is add_shopping_item? +

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

Can I rate-limit add_shopping_item? +

Yes. Add a rate_limit block to the add_shopping_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 add_shopping_item completely? +

Set action: deny in the PolicyLayer policy for add_shopping_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 add_shopping_item? +

add_shopping_item is provided by the Pantrist MCP server (pantrist-dev/pantrist-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.