query_payment_conditions

THE RISK

Low Risk

Why query_payment_conditions needs a policy

This tool queries and retrieves payment condition options (installment plans, offers) for a given amount and optional customer identifier. It has no side effects — it does not create, modify, delete, or execute any transaction. The agent uses the results to make a decision, but the query itself merely returns available options. This is classic Read category behavior: retrieval of data for decision support.

From the tool's definition Tool description explicitly states "Query available installment/payment conditions" — a retrieval operation with the verb "query" indicating data lookup.

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

POLICY

How to control query_payment_conditions

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_payment_conditions:

policy.json

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

query_payment_conditions is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

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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 query_payment_conditions

What does the query_payment_conditions tool do? +

Query available installment/payment conditions for a given amount and (optionally) shopper CPF. Use before rendering checkout so the agent can pick the best offer. 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_payment_conditions? +

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

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

Can I rate-limit query_payment_conditions? +

Yes. Add a rate_limit block to the query_payment_conditions 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_payment_conditions completely? +

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

query_payment_conditions 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.

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