mark_grocery_bought · CoupleHub MCP Server MCP

WHAT IT DOES

What mark_grocery_bought does on CoupleHub MCP Server

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

WHY IT NEEDS A POLICY

Why mark_grocery_bought needs a policy

This tool modifies data (grocery list item state) reversibly—marking an item as bought can be undone by unmarking it. It does not permanently delete data, execute code, move money, or create irreversible changes. The blast radius is minimal: worst case, grocery list state becomes temporarily inconsistent until corrected. Hence it is Write, not Destructive or higher.

From the tool's definition Tool name 'mark_grocery_bought' and description 'Mark grocery list rows as purchased' indicate state modification of grocery list items from unpurchased to purchased status.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

mark_grocery_bought Rate-limited

mark_grocery_bought 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": {
    "mark_grocery_bought": {
      "limits": [
        {
          "counter": "mark_grocery_bought_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 CoupleHub MCP Server, so you can run agents against it safely.

FAQ

Questions about mark_grocery_bought

What does the mark_grocery_bought tool do? +

Mark grocery list rows as purchased. It is categorised as a Write tool in the CoupleHub 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 mark_grocery_bought? +

Register the CoupleHub MCP Server MCP server in PolicyLayer and add a rule for mark_grocery_bought: 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 CoupleHub MCP Server. Nothing to install.

What risk level is mark_grocery_bought? +

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

Can I rate-limit mark_grocery_bought? +

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

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

mark_grocery_bought is provided by the CoupleHub MCP Server MCP server (uczesieweba/couplehub-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.