create_income_from_payment

THE RISK

Medium Risk

Why create_income_from_payment needs a policy

This tool creates new financial transaction records in Wave Accounting. While the creation itself is reversible (Write rather than Destructive), it directly modifies the user's accounting data by adding income transactions.

From the tool's definition Tool description states it 'Create[s] an income transaction in Wave' - this is a create operation that modifies financial data in the accounting system.

Documented attack patterns abuse exactly the kind of access create_income_from_payment gives an agent:

POLICY

How to control create_income_from_payment

PolicyLayer is an MCP gateway — it sits between your AI agents and Wave Accounting MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for create_income_from_payment:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "create_income_from_payment": {
      "limits": [
        {
          "counter": "create_income_from_payment_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

create_income_from_payment 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.

Create a free account and register Wave Accounting MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

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EXPLORE

Related tools and policies

More Wave Accounting MCP Server tools

Write create_expense_from_receipt Create an expense in Wave from receipt data. Vendor is optional - expenses can be created Write set_business Set the active business for operations Read debug_accounts Debug tool: List ALL accounts with their types and subtypes to help diagnose account detec Read get_expense_accounts Get a list of expense accounts to help categorize receipts Read get_income_accounts Get a list of income accounts to help categorize income transactions Read list_businesses List all available Wave businesses with pagination Read search_customer Search for an existing customer in Wave Read search_vendor Search for an existing vendor in Wave (vendors must be created manually in Wave

All 9 Wave Accounting MCP Server tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about create_income_from_payment

What does the create_income_from_payment tool do? +

Create an income transaction in Wave from payment/receipt data. Customer is optional - income can be created without customer association and customers can be added later. It is categorised as a Write tool in the Wave Accounting 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_income_from_payment? +

Register the Wave Accounting MCP Server MCP server in PolicyLayer and add a rule for create_income_from_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 Wave Accounting MCP Server. Nothing to install.

What risk level is create_income_from_payment? +

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

Can I rate-limit create_income_from_payment? +

Yes. Add a rate_limit block to the create_income_from_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 create_income_from_payment completely? +

Set action: deny in the PolicyLayer policy for create_income_from_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 create_income_from_payment? +

create_income_from_payment is provided by the Wave Accounting MCP Server MCP server (vinnividivicci/wave_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Wave Accounting MCP Server tool call.

Start from Wave Accounting MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →