get_payment_methods_by_site

THE RISK

Low Risk

Why get_payment_methods_by_site needs a policy

This tool queries and returns a list of available payment methods for a specified Mercado Pago site. It performs a read-only operation that retrieves existing configuration data without creating, modifying, deleting, or executing any transactions. The blast radius of misuse is minimal — an attacker could only enumerate payment options, which are typically public information.

From the tool's definition Tool name is 'get_payment_methods_by_site' and description states 'List available payment methods' — a retrieval operation with no modification or side effects.

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

POLICY

How to control get_payment_methods_by_site

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 get_payment_methods_by_site:

policy.json

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

get_payment_methods_by_site 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

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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 →
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FAQ

Questions about get_payment_methods_by_site

What does the get_payment_methods_by_site tool do? +

List available payment methods for a specific Mercado Pago site (MLB=Brazil, MLA=Argentina, MLM=Mexico, MLC=Chile, MCO=Colombia, MPE=Peru, MLU=Uruguay). 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 get_payment_methods_by_site? +

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

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

Can I rate-limit get_payment_methods_by_site? +

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

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

get_payment_methods_by_site 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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