Your AI roadmap does not die from a bad model. It dies from integration glue code — the hand-written adapter that wires agent number four to backend number nine, times every agent and every backend you will ever build. Model Context Protocol (MCP) is the thing that stops that multiplication. This is Part 1 of a 15-part deep dive. Every part uses the same running example: Mattrx , our multi-tenant marketing-analytics SaaS (.NET 9 / Azure), and every metric here is from that real system. ...