lookup_dict_key

THE RISK

Low Risk

Why lookup_dict_key needs a policy

This is a lookup/query operation that retrieves data from DICT (the Brazilian direct identification registry) without side effects. It matches the Read category definition: retrieves or queries data with no side effects. The blast radius is low as it only returns publicly or semi-publicly available owner information tied to identifiers.

From the tool's definition Tool performs 'Resolve a DICT key...to the owner' which retrieves ownership information associated with identifiers (CPF, CNPJ, email, phone, EVP). No modification, deletion, or execution of external operations occurs.

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

POLICY

How to control lookup_dict_key

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_dict_key:

policy.json

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

lookup_dict_key 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_dict_key

What does the lookup_dict_key tool do? +

Resolve a DICT key (CPF, CNPJ, email, phone, EVP) to the owner. 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_dict_key? +

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

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

Can I rate-limit lookup_dict_key? +

Yes. Add a rate_limit block to the lookup_dict_key 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_dict_key completely? +

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

lookup_dict_key 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.

CHECK YOUR STACK →