Give your AI agent access to 67M Brazilian companies, free MCP server

Originally posted on the CNPJ Aberto blog (PT-BR) . This post is the English version, kept in sync. If you've ever asked Claude to look up a Brazilian company by its CNPJ (the federal tax ID equivalent to a US EIN), you know how it goes: It guesses, badly. It says "I can't access external data." It fires up web search and lands on a captcha-walled aggregator that returns half a page. There's a fourth option now. You can give Claude — or any Model Context Protocol (MCP) client like Cursor, Cline,