lookup_bank_by_code

THE RISK

Low Risk

Why lookup_bank_by_code needs a policy

This tool performs a simple data lookup operation against a static registry of banks. It retrieves publicly available bank identification information (name/details associated with an ABM/SPEI code) with no side effects, no modifications to data, and no irreversible actions. The only risk is potential information disclosure, which is low given the data is public regulatory reference material.

From the tool's definition The tool name 'lookup_bank_by_code' and description 'Look up a participating bank by its ABM/SPEI code' indicate retrieval of bank reference data without modification or execution of operations.

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

POLICY

How to control lookup_bank_by_code

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 lookup_bank_by_code:

policy.json

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

lookup_bank_by_code 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 lookup_bank_by_code

What does the lookup_bank_by_code tool do? +

Look up a participating bank by its ABM/SPEI code (first 3 digits of CLABE). 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 lookup_bank_by_code? +

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

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

Can I rate-limit lookup_bank_by_code? +

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

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

lookup_bank_by_code 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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