The JVM has bytecode and .NET has IL. Over the last couple of weeks Screenplay became that for the business: one .play model that people, AI assistants, Studio and your C# code all write, and that VS Code, your MCP host, your running Arc application and the Cratis CLI all draw as the same event model board.
A shared board and canvas where people and AI agents work on the same event model, Screenplay text you can diff, and opt-in code for one slice in your own repository. What Cratis Studio does at each step, and where each step stops.
Prologue stands beside a running system, records the metadata of what it does, and proposes a Screenplay model for a person to correct. What it watches, what it never records, how it groups what it sees, and what a language model may and may not change.
Stage renders a narrow slice of a Screenplay model into C# on Arc and Chronicle, boots a throwaway sandbox and runs the model's examples, and refuses with a code whatever it can't express. Scene is the UI model between a screen in the model and React.
The .play language for writing an event model down next to the code, a compiler whose diagnostic codes don't change, personal data declared once on a value, and an MCP server that lets an assistant propose changes a person applies.
An event records something that happened, and no event is taken out of the log afterwards. How to name and shape events that still read in five years, and what Chronicle stores with each one: a sequence number, its source, the operation it belonged to, who caused it and why.
