settle_payment · Expense MCP: Risk & Policy

WHAT IT DOES

What settle_payment does on Expense

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

WHY IT NEEDS A POLICY

Why settle_payment needs a policy

This tool records financial settlements between members, which constitutes committing a financial transaction or obligation. Misuse could result in incorrect financial records, disputed settlements, or fraudulent payment recordings. It falls under Financial as it directly handles monetary transfers/settlements between parties.

From the tool's definition settle_payment — 'Record a settlement payment between two members'

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

settle_payment Approval-gated

Any call to settle_payment 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": {
    "settle_payment": {
      "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 Expense, so you can run agents against it safely.

FAQ

Questions about settle_payment

What does the settle_payment tool do? +

Record a settlement payment between two members. It is categorised as a Financial tool in the Expense MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on settle_payment? +

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

What risk level is settle_payment? +

settle_payment 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 settle_payment? +

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

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

settle_payment is provided by the Expense MCP server (shivamprasad1001/expense-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.