lookup_pix_dict

THE RISK

Low Risk

Why lookup_pix_dict needs a policy

This tool performs a lookup/query operation on a Pix DICT (Diretório de Identificadores de Contas Transacionáveis) registry. It retrieves account holder and banking information based on a Pix key input, but does not modify, execute, delete, or commit any financial transactions. The data retrieved may be sensitive (account holder info, bank details), but the tool itself is purely informational and read-only.

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 retrieval operation that queries payment system registry 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 Ap2, 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 Ap2 — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

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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 Ap2 MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on lookup_pix_dict? +

Register the Mcp Ap2 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 Ap2. 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 Ap2 MCP server (@codespar/mcp-ap2). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Mcp Ap2 tool call.

Start from Mcp Ap2, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →