create_customer

Create a new customer record

SERVERStripe SOURCE@modelcontextprotocol/server-stripe

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade D, identity verified Pull the record →

This record as markdown: /tools/stripe/create-customer.md

WHAT IT DOES

What create_customer does on Stripe

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

RISK

Why create_customer is rated Medium

This tool creates a new customer record, which is a reversible write operation. While it does not directly move money or delete data, creating customer records in a payment processor can enable downstream financial transactions. The medium severity reflects that misuse could facilitate fraudulent accounts or spam, but the operation itself is not irreversible and does not immediately commit financial obligations.

From the tool's definition Tool name 'create_customer' and description 'Create a new customer record' — creates new data in Stripe's system.

Risk signalsCreates customer records in Stripe

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs create_customer safely

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

create_customer Rate-limited

create_customer 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": {
    "create_customer": {
      "limits": [
        {
          "counter": "create_customer_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about create_customer

What does the create_customer tool do? +

Create a new customer record. It is categorised as a Write tool in the Stripe MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_customer? +

Register the Stripe MCP server in PolicyLayer and add a rule for create_customer: 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 Stripe. Nothing to install.

What risk level is create_customer? +

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

Can I rate-limit create_customer? +

Yes. Add a rate_limit block to the create_customer 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_customer completely? +

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

create_customer is provided by the Stripe MCP server (@modelcontextprotocol/server-stripe). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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