prijs_alert

THE RISK

Medium Risk

Why prijs_alert needs a policy

This tool creates a new price alert configuration in the system, which is a reversible data modification. It stores user preferences for price notifications but does not execute transactions, delete data irreversibly, or run arbitrary code. The blast radius is minimal—misuse would only result in unwanted price notifications for the user, with no financial impact or data loss.

From the tool's definition Tool name 'prijs_alert' (price alert) and description 'Stel een prijsalert in' (Set up a price alert) and 'Krijg melding wanneer product onder bepaalde prijs komt' (Get notification when product goes below certain price) indicates the tool creates or modifies…

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

POLICY

How to control prijs_alert

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

policy.json

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

prijs_alert 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 NL Supermarkt 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 NL Supermarkt MCP Server tools

Execute plan_winkelroute Optimaliseer route langs meerdere winkels voor je boodschappenlijst. Write bewaar_boodschappenlijst Bewaar een boodschappenlijst om later te hergebruiken. Write optimaliseer_boodschappenlijst Optimaliseer boodschappenlijst voor supermarkten en drogisten. Write plan_boodschappen Plan boodschappen met weekmenu en gedetailleerde boodschappenlijst. Write set_budget Stel een weekbudget in voor boodschappen. Read budget_check Check of boodschappenlijst binnen budget past. Suggereert goedkopere alternatieven. Read check_alerts Check alle actieve prijsalerts en toon welke producten nu een goede deal zijn. Read bekijk_aanbiedingen Bekijk folder aanbiedingen van supermarkten EN drogisterijen. Categorieën: haarverzorging

All 20 NL Supermarkt MCP Server tools →

Write tools on other servers

M-Team MCP Server download_torrent YouTube MCP Server generate_video_title Android Forensics ADB MCP Server combine_reports 0xarchive web3_signup

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 prijs_alert

What does the prijs_alert tool do? +

Stel een prijsalert in. Krijg melding wanneer product onder bepaalde prijs komt of in aanbieding is. It is categorised as a Write tool in the NL Supermarkt 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 prijs_alert? +

Register the NL Supermarkt MCP Server MCP server in PolicyLayer and add a rule for prijs_alert: 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 NL Supermarkt MCP Server. Nothing to install.

What risk level is prijs_alert? +

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

Can I rate-limit prijs_alert? +

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

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

prijs_alert is provided by the NL Supermarkt MCP Server MCP server (samvox1/nl-supermarkt-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every NL Supermarkt MCP Server tool call.

Start from NL Supermarkt 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 →