validate_cnpj

IDCloud: validate a Brazilian CNPJ with Receita Federal. Returns company status (ATIVA, BAIXADA, SUSPENSA, INAPTA), legal name, trade name, partners (QSA), address, and primary CNAE.

ServerMcp Afip
CategoryRead

How to control validate_cnpj ↓

WHAT IT DOES

What validate_cnpj does on Mcp Afip

AI agents call validate_cnpj to retrieve information from Mcp Afip without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

THE RISK

Low Risk

Why validate_cnpj needs a policy

This tool retrieves and validates public business registration information from a Brazilian tax authority database. It performs a read-only lookup operation with no side effects—it does not create, modify, delete data, execute code, or trigger financial transactions. The response is informational only.

From the tool's definition Tool description states it 'validate[s]' and 'Returns' data (company status, legal name, trade name, partners, address, CNAE).

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

POLICY

How to control validate_cnpj

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 validate_cnpj:

policy.json

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

validate_cnpj 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 →

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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 validate_cnpj

What does the validate_cnpj tool do? +

IDCloud: validate a Brazilian CNPJ with Receita Federal. Returns company status (ATIVA, BAIXADA, SUSPENSA, INAPTA), legal name, trade name, partners (QSA), address, and primary CNAE. 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 validate_cnpj? +

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

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

Can I rate-limit validate_cnpj? +

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

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

validate_cnpj 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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1300 Mcp Afip tools catalogued and risk-classified — across an index of 43,000+ MCP servers.