MCP is shiny and new. Formulize is a 20 year old, open source, data management system. We added an MCP server to this old school PHP code. Let me show you how, and the lessons learned, from crafting tools that AI can understand, to super robust error reporting. But the real secret sauce was giving AI access to the business logic. The end result: a free, open source, AI-enabled data management platform, where any app you make is AI-enabled too!