create_refund

Process a refund for a Stripe charge

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-refund.md

WHAT IT DOES

What create_refund does on Ncp

AI agents use create_refund 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_refund is rated Critical

This tool directly commits a financial obligation by issuing refunds through Stripe, which moves money. Financial tools are the most severe category per the classification hierarchy. A misused refund could result in unintended money transfers, customer refunds issued fraudulently, or financial loss.

From the tool's definition Tool name 'create_refund' and description 'Process a refund for a Stripe charge' explicitly indicates money movement via a payment processor.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs create_refund 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_refund, this is the rule to start with:

create_refund Approval-gated

Any call to create_refund 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_refund": {
      "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_refund call is checked against it from then on.

FAQ

Questions about create_refund

What does the create_refund tool do? +

Process a refund for a Stripe charge. 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_refund? +

Register the Ncp MCP server in PolicyLayer and add a rule for create_refund: 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_refund? +

create_refund 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_refund? +

Yes. Add a rate_limit block to the create_refund 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_refund completely? +

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

create_refund 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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