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Edit the class, hit Apply (or Ctrl+Enter) and the terminal rebinds to your code: Roslyn compiles it in the browser, your /// comments become the -h help text, and method names become commands. Hover a symbol for its signature and docs; completion opens as you type (Ctrl+Space forces it); clean code applies itself after a moment. Try greet --name world, add numbers -h, Tab completion, ↑ history. The first Apply takes a few seconds.