create_subscription

Create a recurring subscription

SERVERNcp SOURCE@portel/ncp

Critical RISK CLASS

Category Financial

Parameters 00 required

Recommended Approval-gatedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-portel-dev-ncp/create-subscription.md

WHAT IT DOES

What create_subscription does on Ncp

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

RISK

Why create_subscription is rated Critical

Creating a recurring subscription involves financial commitments that repeat over time (e.g., monthly/annual billing). This is a Financial category action as it establishes ongoing monetary obligations. The blast radius is critical because misuse could result in repeated, ongoing financial charges that may be difficult to reverse.

From the tool's definition "Create a recurring subscription" — directly commits to a recurring financial obligation

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs create_subscription safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Ncp, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For create_subscription, this is the rule to start with:

create_subscription Approval-gated

Any call to create_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": {
    "create_subscription": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

GATE THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Ncp, apply this rule, and every create_subscription call is checked against it from then on.

FAQ

Questions about create_subscription

What does the create_subscription tool do? +

Create a recurring subscription. It is categorised as a Financial tool in the Ncp MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on create_subscription? +

Register the Ncp MCP server in PolicyLayer and add a rule for create_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 Ncp. Nothing to install.

What risk level is create_subscription? +

create_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 create_subscription? +

Yes. Add a rate_limit block to the create_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 create_subscription completely? +

Set action: deny in the PolicyLayer policy for create_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 create_subscription? +

create_subscription is provided by the Ncp MCP server (@portel/ncp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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