cancel_subscription · Systemeio MCP: Risk & Policy

WHAT IT DOES

What cancel_subscription does on Systemeio

AI agents use cancel_subscription to commit financial operations through Systemeio — usually the final step of a payment, billing, or trading workflow. A call moves real money.

WHY IT NEEDS A POLICY

Why cancel_subscription needs a policy

Cancelling a payment subscription directly affects financial obligations and revenue streams. It terminates a recurring financial commitment, making it a Financial category action.

From the tool's definition Cancel a payment subscription. The subscription will end at the end of the current billing cycle.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

cancel_subscription Approval-gated

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

View as policy code

policy.json

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

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

FAQ

Questions about cancel_subscription

What does the cancel_subscription tool do? +

Cancel a payment subscription. The subscription will end at the end of the current billing cycle. It is categorised as a Financial tool in the Systemeio MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on cancel_subscription? +

Register the Systemeio MCP server in PolicyLayer and add a rule for cancel_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 Systemeio. Nothing to install.

What risk level is cancel_subscription? +

cancel_subscription 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 cancel_subscription? +

Yes. Add a rate_limit block to the cancel_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 cancel_subscription completely? +

Set action: deny in the PolicyLayer policy for cancel_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 cancel_subscription? +

cancel_subscription is provided by the Systemeio MCP server (snzeeee/mcp-server-systemeio). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.