create_prepost

THE RISK

Medium Risk

Why create_prepost needs a policy

This tool creates a new pre-posting order, which is a reversible write operation that establishes a shipping record in the AFIP system. While it modifies data, it does not delete, execute arbitrary code, or move money—making it Write rather than a higher category.

From the tool's definition Tool name 'create_prepost' and description 'Create a pre-posting order for shipping' indicate creation of a new shipping order record. The verb 'create' explicitly signals data modification.

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

POLICY

How to control create_prepost

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_prepost:

policy.json

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

create_prepost 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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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_prepost

What does the create_prepost tool do? +

Create a pre-posting order for shipping. 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_prepost? +

Register the Mcp Afip MCP server in PolicyLayer and add a rule for create_prepost: 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_prepost? +

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

Can I rate-limit create_prepost? +

Yes. Add a rate_limit block to the create_prepost 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_prepost completely? +

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

create_prepost 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 →