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Causality Cage: Open-Source Tool Pinpoints Minimal Root Cause of Browser Bugs

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A developer has released Causality Cage, an open-source CLI tool that automatically identifies the minimal set of conditions causing a browser bug by replaying failing and passing sessions in Chromium. The tool toggles variables such as API responses, localStorage, cookies, and latency using hierarchical delta debugging to isolate the true cause. It outputs a standalone HTML report with an interactive causal graph, allowing users to neutralize individual factors and observe their effect on the failure. When tested against a known bug in the RealWorld React app, the tool returned a full causal chain in 19 experiments within 25 seconds. The project runs entirely locally with no LLM calls, is available on npm under the MIT license, and its creator is actively seeking feedback on cases where it produces incorrect or unhelpful results.

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Causality Cage: Open-Source Tool Pinpoints Minimal Root Cause of Browser Bugs · ShortSingh