modify_subscription · HelloFresh MCP Server MCP

WHAT IT DOES

What modify_subscription does on HelloFresh MCP Server

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

WHY IT NEEDS A POLICY

Why modify_subscription needs a policy

This tool creates or modifies subscription settings reversibly (Write category), making it more severe than Read operations. However, it falls short of Destructive (no data deletion) or Financial (no direct payment movement). The severity is medium because misuse could alter a user's subscription commitments, affecting delivery schedules and costs, but changes are typically reversible through the same interface.

From the tool's definition Tool description states it enables 'Change your HelloFresh subscription plan size (meals per week or servings per meal) or delivery frequency' — this modifies subscription parameters that are reversible but affect billing and service delivery.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

modify_subscription Rate-limited

modify_subscription 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": {
    "modify_subscription": {
      "limits": [
        {
          "counter": "modify_subscription_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches HelloFresh MCP Server, so you can run agents against it safely.

FAQ

Questions about modify_subscription

What does the modify_subscription tool do? +

Change your HelloFresh subscription plan size (meals per week or servings per meal) or delivery frequency. It is categorised as a Write tool in the HelloFresh 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 modify_subscription? +

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

What risk level is modify_subscription? +

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

Can I rate-limit modify_subscription? +

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

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

modify_subscription is provided by the HelloFresh MCP Server MCP server (markswendsen-code/mcp-hellofresh). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.