transfer_product

THE RISK

Critical Risk

transfer_product moves real money, and an autonomous agent will call it with the same confidence it calls a search tool. A misread instruction or an injected prompt is all it takes to drain an account or blow a budget.

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

HOW TO CONTROL TRANSFER_PRODUCT

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "transfer_product": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

Any call to transfer_product is blocked until a human approves it. The rest of the server keeps working.

Create a free account and register MCP Grocy API — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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Free to start. No card required.

EXPLORE

More MCP Grocy API tools

Financial charge_battery Track charging of a battery in your Grocy instance. Destructive remove_shopping_list_item Remove an item from your shopping list. Write add_missing_products_to_shopping_list Add all missing products for a recipe to your shopping list. Write add_recipe_products_to_shopping_list Add not fulfilled products of a recipe to the shopping list. Write add_recipe_to_meal_plan Add a recipe to the meal plan. Write add_shopping_list_item Add an item to your shopping list. Write complete_task Mark a task as completed in your Grocy instance. Write create_recipe Create a new recipe in your Grocy instance.

All 37 MCP Grocy API tools →

Financial tools on other servers

Atv build_deposit_tx Bitcoin MCP Server pay_invoice AbraFlexi bank_transaction_create Hilanet MCP decrease_coworker_salary

Go deeper

Critical-risk tools in MCP Grocy API → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
How to Add Spending Controls to Any MCP Agent →
Rate Limiting MCP Tool Calls: A Practical Guide →

FAQ

What does the transfer_product tool do? +

Transfer a product from one location to another in your Grocy instance. It is categorised as a Financial tool in the MCP Grocy API MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on transfer_product? +

Register the MCP Grocy API MCP server in PolicyLayer and add a rule for transfer_product: 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 Grocy API. Nothing to install.

What risk level is transfer_product? +

transfer_product is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit transfer_product? +

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

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

transfer_product is provided by the MCP Grocy API MCP server (saya6k/mcp-grocy-api). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MCP Grocy API tool call.

Deterministic rules across all 37 MCP Grocy API tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

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// WHAT TRANSFER_PRODUCT ON MCP GROCY API DOES

// THE RISK

// HOW TO CONTROL TRANSFER_PRODUCT

// EXPLORE