list_merchants

THE RISK

Low Risk

Why list_merchants needs a policy

This tool queries and returns data about merchant accounts accessible to the caller. The verb 'list' and the lack of any modification, deletion, or execution language confirms this is a read-only operation. The severity is low because it retrieves data without altering state, though exposure could reveal merchant account information depending on access controls.

From the tool's definition Tool name 'list_merchants' and description 'List merchant accounts visible to the API credential' indicate a retrieval operation with no side effects.

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

POLICY

How to control list_merchants

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_merchants:

policy.json

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

list_merchants 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 →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about list_merchants

What does the list_merchants tool do? +

List merchant accounts visible to the API credential (Management API v3). 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_merchants? +

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

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

Can I rate-limit list_merchants? +

Yes. Add a rate_limit block to the list_merchants 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_merchants completely? +

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

list_merchants 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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