lookup_pix_dict

THE RISK

Low Risk

Why lookup_pix_dict needs a policy

This tool performs a lookup/resolution operation—querying the DICT (Diretório de Identificadores de Contas Transversais) system to retrieve publicly resolvable account holder and bank information associated with a Pix key. It has no side effects, does not create, modify, delete, or execute operations, and does not move money. It is a pure data retrieval function.

From the tool's definition Tool name 'lookup_pix_dict' and description 'resolves a Pix key to account holder + bank info' indicate a read-only query operation that retrieves and returns existing data without modification.

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

POLICY

How to control lookup_pix_dict

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_pix_dict:

policy.json

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

lookup_pix_dict 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_pix_dict

What does the lookup_pix_dict tool do? +

Lookup a Pix DICT key — resolves a Pix key to account holder + bank info. 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_pix_dict? +

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

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

Can I rate-limit lookup_pix_dict? +

Yes. Add a rate_limit block to the lookup_pix_dict 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_pix_dict completely? +

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

lookup_pix_dict 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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