Validates a Brazilian CNPJ (Cadastro Nacional da Pessoa Jurídica) — the 14-digit company registration number issued by the Receita Federal. Applies the official two-pass weighted checksum algorithm. Returns { valid: boolean, cnpj: string } for valid CNPJs, or { valid: false, reason: string } for ...
AI agents call validate_cnpj to retrieve information from Mcp Latam Business without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and validates information (the validity status of a CNPJ) with no capability to create, modify, delete, execute code, or move money. It is a pure read/query operation on a static input. Blast radius is minimal: misuse would only return incorrect validation results, not compromise data or systems. Low severity and high confidence reflect its benign nature as a compliance data-retrieval utility.
From the tool's definition Tool description states 'Validates' and 'Returns { valid: boolean, cnpj: string }' — it checks a number against a checksum algorithm without modifying data or triggering side effects.
Attacks that exploit this kind of access
Validates a Brazilian CNPJ (Cadastro Nacional da Pessoa Jurídica) — the 14-digit company registration number issued by the Receita Federal. Applies the official two-pass weighted checksum algorithm. Returns { valid: boolean, cnpj: string } for valid CNPJs, or { valid: false, reason: string } for invalid format or failed checksum. Use when processing Brazilian B2B invoices (Notas Fiscais), supplier onboarding, or any compliance workflow requiring a verified Brazilian company tax ID. Offline validation only. It is categorised as a Read tool in the Mcp Latam Business MCP Server, which means it retrieves data without modifying state.
Register the Mcp Latam Business 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 Latam Business. Nothing to install.
validate_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 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.
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.
validate_cnpj is provided by the Mcp Latam Business MCP server (josemvelez78/mcp-latam-business). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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