get_corretora

THE RISK

Low Risk

Why get_corretora needs a policy

This tool performs a straightforward query of publicly registered brokerage information using a CNPJ identifier. It only retrieves data with no ability to modify, delete, or execute actions. The data queried (CVM-registered brokerages) is public regulatory information. Even if misused by an AI agent, the worst outcome is disclosure of publicly available information, resulting in minimal risk.

From the tool's definition 'Look up a single CVM-registered brokerage by CNPJ' — retrieves public registry data without modification or side effects

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

POLICY

How to control get_corretora

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 get_corretora:

policy.json

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

get_corretora 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.

CAP THIS TOOL →

Free to start. No card required.

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 get_corretora

What does the get_corretora tool do? +

Look up a single CVM-registered brokerage by CNPJ. 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 get_corretora? +

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

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

Can I rate-limit get_corretora? +

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

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

get_corretora 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 →