query_installments

THE RISK

Low Risk

Why query_installments needs a policy

This tool retrieves and displays installment plan details (interest rates, maximum installments, per-installment amounts) for informational purposes. It has no side effects: it does not create subscriptions, execute payments, charge cards, or alter financial records.

From the tool's definition Tool description states 'Query the installment plans' — retrieves information about available installment options without modifying data or committing financial transactions.

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

POLICY

How to control query_installments

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 query_installments:

policy.json

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

query_installments 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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Free to start. No card required.

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 query_installments

What does the query_installments tool do? +

Query the installment plans Getnet offers for a given amount + card brand (with/without interest, max installments, per-installment amount). 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 query_installments? +

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

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

Can I rate-limit query_installments? +

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

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

query_installments 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 →