update_payment · Sanka MCP Server MCP: Risk & Policy

WHAT IT DOES

What update_payment does on Sanka MCP Server

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

WHY IT NEEDS A POLICY

Why update_payment needs a policy

Updating a payment modifies financial transaction data, which falls squarely in the Financial category. Misuse could alter payment amounts, statuses, or recipients, with potentially critical financial consequences.

From the tool's definition "Update an existing payment in Sanka" — directly modifies financial payment records

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_payment Approval-gated

Any call to update_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": {
    "update_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 Sanka MCP Server, so you can run agents against it safely.

FAQ

Questions about update_payment

What does the update_payment tool do? +

Update an existing payment in Sanka. It is categorised as a Financial tool in the Sanka MCP Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on update_payment? +

Register the Sanka MCP Server MCP server in PolicyLayer and add a rule for update_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 Sanka MCP Server. Nothing to install.

What risk level is update_payment? +

update_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 update_payment? +

Yes. Add a rate_limit block to the update_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 update_payment completely? +

Set action: deny in the PolicyLayer policy for update_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 update_payment? +

update_payment is provided by the Sanka MCP Server MCP server (sankahq/sanka-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.