create_installment · Tunzaa MCP Server MCP: Risk & Policy

WHAT IT DOES

What create_installment does on Tunzaa MCP Server

AI agents use create_installment 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 create_installment needs a policy

The tool creates a new installment plan, which is a Write operation (creating data). While it involves financial payment structures, it appears to generate/configure payment plan objects rather than directly moving money or committing financial obligations.

From the tool's definition 'Create a new installment plan' - creates a new financial object/record for installment-based payments

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_installment Rate-limited

create_installment 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": {
    "create_installment": {
      "limits": [
        {
          "counter": "create_installment_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 create_installment

What does the create_installment tool do? +

Create a new installment plan. Use this to understand the complex object structure required for installment-based payments. 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 create_installment? +

Register the Tunzaa MCP Server MCP server in PolicyLayer and add a rule for create_installment: 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 create_installment? +

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

Can I rate-limit create_installment? +

Yes. Add a rate_limit block to the create_installment 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_installment completely? +

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

create_installment 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.