I open-sourced a tool that reads code diffs and tests affected UI flows automatically

I've been working on an open-source project called Canary. It reads your code diffs, understands which UI flows are likely affected, and lets Claude Code tests those flows in a real browser. Under the hood, Canary ships with a QuickJS WASM sandbox that exposes the full Playwright API, allowing Claude to perform long-running browser workflows such as authentication, onboarding flows, form submissions, and navigation across complex applications. Each run captures: Screen recordings Playwright traces HAR files Network requests Console logs Screenshots Unlike most agent runs, every Canary session also generates a reusable Playwright script that can be cleaned up and replayed locally or in CI with zero inference cost. Canary UI submitted by /u/wixenheimer [link] [留言]