create_cash_entry

THE RISK

Medium Risk

Why create_cash_entry needs a policy

This tool creates (writes) a new financial ledger entry in an ERP system, which is reversible through standard accounting procedures (reversal entries, corrections). While it affects financial records, it does not move actual money, commit financial obligations, or execute irreversible deletions. The impact is scoped to record creation in the accounting system, making it Write rather than Financial or Destructive.

From the tool's definition Tool name 'create_cash_entry' and description 'Create a bank account ledger entry (lançamento de conta corrente) in Omie ERP' indicate creation of financial records. The action modifies accounting data by adding a new ledger entry to a bank account.

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

POLICY

How to control create_cash_entry

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

policy.json

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

create_cash_entry 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 Mcp Afip — 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 →

Free to start. No card required.

EXPLORE

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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_cash_entry

What does the create_cash_entry tool do? +

Create a bank account ledger entry (lançamento de conta corrente) in Omie ERP. It is categorised as a Write tool in the Mcp Afip 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_cash_entry? +

Register the Mcp Afip MCP server in PolicyLayer and add a rule for create_cash_entry: 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 Mcp Afip. Nothing to install.

What risk level is create_cash_entry? +

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

Can I rate-limit create_cash_entry? +

Yes. Add a rate_limit block to the create_cash_entry 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_cash_entry completely? +

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

create_cash_entry is provided by the Mcp Afip MCP server (codespar/mcp-dev-latam). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Mcp Afip tool call.

Start from Mcp Afip, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →