create_adhoc · PayFast MCP: Risk & Policy

WHAT IT DOES

What create_adhoc does on PayFast MCP

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

WHY IT NEEDS A POLICY

Why create_adhoc needs a policy

This tool charges a tokenized payment card, directly initiating a financial transaction that moves money. It falls squarely in the Financial category as it commits a financial obligation/payment against a stored card token. Misuse could result in unauthorized charges to customer cards, making it critical severity.

From the tool's definition Charge tokenized card (ad-hoc)

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_adhoc Approval-gated

Any call to create_adhoc 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_adhoc": {
      "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 PayFast MCP, so you can run agents against it safely.

FAQ

Questions about create_adhoc

What does the create_adhoc tool do? +

Charge tokenized card (ad-hoc). It is categorised as a Financial tool in the PayFast MCP MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on create_adhoc? +

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

What risk level is create_adhoc? +

create_adhoc 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_adhoc? +

Yes. Add a rate_limit block to the create_adhoc 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_adhoc completely? +

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

create_adhoc is provided by the PayFast MCP server (theyahia/payfast-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.