edit_installment_plan · Tunzaa MCP Server MCP: Risk & Policy

WHAT IT DOES

What edit_installment_plan does on Tunzaa MCP Server

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

WHY IT NEEDS A POLICY

Why edit_installment_plan needs a policy

This tool falls under Write rather than Financial because it modifies the structure/terms of an installment plan rather than directly moving money. However, it operates in a payment system context where modifications to installment plans have downstream financial implications.

From the tool's definition Tool description states 'Update an existing installment plan' and name contains 'edit_'. This modifies financial data (installment plans) reversibly. The server context confirms these are payment-related operations integrated with Tunzaa Payments.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

edit_installment_plan Rate-limited

edit_installment_plan 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": {
    "edit_installment_plan": {
      "limits": [
        {
          "counter": "edit_installment_plan_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Tunzaa MCP Server, so you can run agents against it safely.

FAQ

Questions about edit_installment_plan

What does the edit_installment_plan tool do? +

Update an existing installment plan. Use this to understand which fields are mutable via the Tunzaa API. It is categorised as a Write tool in the Tunzaa MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on edit_installment_plan? +

Register the Tunzaa MCP Server MCP server in PolicyLayer and add a rule for edit_installment_plan: 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 Tunzaa MCP Server. Nothing to install.

What risk level is edit_installment_plan? +

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

Can I rate-limit edit_installment_plan? +

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

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

edit_installment_plan is provided by the Tunzaa MCP Server MCP server (tunzaa/tunzaa_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.