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I connected Codex to IntelliJ's MCP server, then used a one-route Play 3 app to verify the connection with a real breakpoint and a live variable. The exercise also exposed Play's sbt layout and what Action[AnyContent] means.
One button turns my open Scala file into a focused lesson. How I built a native IntelliJ panel with Codex, connected DeepSeek, and used an unfinished class as the first real example.
A real IntelliJ development instance, a Scala-focused plugin, and my own graphite theme and hoodie mascot. The architecture, desktop screenshots, and tests behind the first working milestone.