list_receipts

THE RISK

Low Risk

Why list_receipts needs a policy

This tool queries and retrieves receipt data from the AFIP system. 'List' operations are fundamentally read-only with no side effects—they do not create, modify, delete, or execute external actions. The blast radius of misuse is minimal since the tool only exposes existing data that the authenticated user has access to retrieve.

From the tool's definition Tool name 'list_receipts' and description 'List receipts (recibos)' indicate a retrieval operation with no modification or deletion.

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

POLICY

How to control list_receipts

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 list_receipts:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "list_receipts": {}
  }
}

list_receipts is read-only, so it stays allowed — but 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.

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EXPLORE

Related tools and policies

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about list_receipts

What does the list_receipts tool do? +

List receipts (recibos). It is categorised as a Read tool in the Mcp Afip MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_receipts? +

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

list_receipts is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit list_receipts? +

Yes. Add a rate_limit block to the list_receipts 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 list_receipts completely? +

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

list_receipts 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 →