Create a sales receipt (paid-on-the-spot sale — combines invoice + payment). CustomerRef and Line items required.
AI agents use create_sales_receipt to create or update resources in Mcp Afip — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mcp Afip environment.
This tool creates financial records (sales receipt combining invoice and payment) in the Argentine tax authority's electronic invoicing system. While it creates/writes data rather than destroying it, the high severity reflects that misuse could generate fraudulent tax records, unauthorized sales entries, or financial obligations.
From the tool's definition Tool creates a sales receipt which combines invoice and payment generation. Description states 'Create a sales receipt' with required CustomerRef and Line items, indicating irreversible financial record creation in an official tax authority system.
Documented attack patterns abuse exactly the kind of access create_sales_receipt gives an agent:
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_sales_receipt:
{
"version": "1",
"default": "deny",
"tools": {
"create_sales_receipt": {
"limits": [
{
"counter": "create_sales_receipt_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_sales_receipt 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.
Free to start. No card required.
Create a sales receipt (paid-on-the-spot sale — combines invoice + payment). CustomerRef and Line items required. 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.
Register the Mcp Afip MCP server in PolicyLayer and add a rule for create_sales_receipt: 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.
create_sales_receipt is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the create_sales_receipt 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.
Set action: deny in the PolicyLayer policy for create_sales_receipt. 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.
create_sales_receipt 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.
Start from Mcp Afip, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
1300 Mcp Afip tools catalogued and risk-classified — across an index of 43,000+ MCP servers.