partial_debit

THE RISK

Critical Risk

Why partial_debit needs a policy

This tool directly initiates a financial charge against a customer's payment card, moving money and committing financial obligations. Misuse by an AI agent could result in unauthorized charges to customer cards, making it Financial category with critical severity.

From the tool's definition "Charge a partial amount from a previously authorized card"

Documented attack patterns abuse exactly the kind of access partial_debit gives an agent:

POLICY

How to control partial_debit

PolicyLayer is an MCP gateway — it sits between your AI agents and Paystack, and nothing reaches the server without passing your rules. This is the rule we recommend for partial_debit:

policy.json

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

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

Create a free account and register Paystack — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

GATE THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

Critical-risk tools in Paystack → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Human-in-the-loop → When a tool call should wait for a person — and when policy can decide alone.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
How to Add Spending Controls to Any MCP Agent →
Rate Limiting MCP Tool Calls: A Practical Guide →

FAQ

Questions about partial_debit

What does the partial_debit tool do? +

Charge a partial amount from a previously authorized card. It is categorised as a Financial tool in the Paystack MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on partial_debit? +

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

What risk level is partial_debit? +

partial_debit 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 partial_debit? +

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

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

partial_debit is provided by the Paystack MCP server (kohasummons/paystack-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Paystack tool call.

Start from Paystack, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →