Junie /demo: Turn code changes into video demos

Junie /demo is a Junie CLI mode designed to automate interactive application checks after code changes by building and launching an app, navigating its interface, executing requested scenarios, and producing inspectable HTML reports, screenshots, and videos. Users can provide specific actions and expected outcomes, such as updating issue statuses and confirming persistence after a page reload, with clearer prompts improving the reliability of the demonstration. Generated videos include model-created introductory, scenario, and results slides, optional subtitles, and accompanying reports that show completed, failed, or incomplete checks. Junie /demo can also be integrated with GitHub Actions to attach demonstrations to pull requests or run repeatable release smoke tests, although workflows should require an explicit PASS verdict rather than treating process completion as success. It runs in a Debian-based Docker environment using Chromium, virtual desktop tools, and a Computer Use-capable model, with configurable templates for complex repositories and monorepos. Internal JetBrains use has produced thousands of PR demonstration videos and smoke tests, while reported model cost and speed comparisons are described as workload-specific rather than general guarantees.

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