How I Built a 55-Tool MCP Server That Runs an Entire Business
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Every ERP has a REST API. Ours has one too. But what made everything click was building an MCP server on top of it — 55 tools that let any AI agent manage invoices, expenses, clients, taxes, and accounting through natural language. This is the story of how I built it, what I learned, and why MCP might be the most underrated protocol in business software right now. Why MCP, not just REST I had a perfectly good REST API. Cursor pagination, field selection, 6 filter types, OpenAPI spec