Get information about a company given a CNPJ.
AI agents call get_cnpj to retrieve information from BrasilAPI MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
CNPJ | string | — | The CNPJ to query |
Parameters from the server's own tool schema.
This tool queries company information based on a CNPJ (Brazilian business registration number). It is a read-only operation that retrieves data from a public database without creating, modifying, deleting, or executing any actions. The operation has no side effects and poses minimal security risk in typical use.
From the tool's definition Tool name 'get_cnpj' and description 'Get information about a company' indicate retrieval of data without modification or side effects.
Attacks that exploit this kind of access
Get information about a company given a CNPJ. It is categorised as a Read tool in the BrasilAPI MCP Server MCP Server, which means it retrieves data without modifying state.
get_cnpj accepts 1 parameter: CNPJ. The full parameter table on this page comes from the server's own tool schema.
Register the BrasilAPI MCP Server MCP server in PolicyLayer and add a rule for get_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 BrasilAPI MCP Server. Nothing to install.
get_cnpj is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the get_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.
Set action: deny in the PolicyLayer policy for get_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.
get_cnpj is provided by the BrasilAPI MCP Server MCP server (mauricio-cantu/brasil-api-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
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