MVA Architecture: Why Every MCP Framework Has Been Building for the Wrong Consumer

Every framework ever built assumed one thing: a human is reading the output . Rails, Laravel, Express, tRPC — beautiful frameworks. But they all have a blind spot: they were designed for browsers and humans, not for AI agents. In 2025, MCP (Model Context Protocol) changed everything. Now AI agents are the consumers of our APIs. But here's the problem: every MCP framework still builds for humans . What Goes Wrong When Agents Consume Human-Designed APIs Consider this tool response: { "amount" : 45000 , "currency" : "USD" } Is that $45,000 or $450.00 (stored as cents)? A human reads the UI and knows. An AI agent has no idea — and the consequences can be catastrophic. This is not a bug. It's a fundamental architectural mismatch . Introducing MVA: Model-View-Agent MVA is a new architectural pattern for the MCP ecosystem, implemented in mcp-fusion . It adds a Presenter layer — a dedicated perception layer that transforms raw data into agent-readable output: class InvoicePresenter extends Fus