company_check

THE RISK

Low Risk

Why company_check needs a policy

This is a Know-Your-Business (KYB) lookup tool that queries and retrieves corporate information from AFIP records. It performs validation and returns existing data about a company (corporate profile, shareholders/QSA, regulatory status, sanctions). There are no side effects, no data creation/modification, and no irreversible actions.

From the tool's definition Tool description states 'validate a CNPJ, return corporate profile, QSA, regularity, sanctions' — all read-only query operations. POST method is used for validation request submission, but returns data only; no modification, deletion, or state changes occur.

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

POLICY

How to control company_check

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 company_check:

policy.json

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

company_check 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 company_check

What does the company_check tool do? +

KYB — validate a CNPJ, return corporate profile, QSA, regularity, sanctions. POST /v1/checks/company. 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 company_check? +

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

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

Can I rate-limit company_check? +

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

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

company_check 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 →