How to Add Automated Testing to Cursor, Copilot, and Codex

AI coding agents may skip browser testing when repositories do not explicitly define verification requirements, and the text argues that shared instruction files can reduce this problem across Cursor, GitHub Copilot, and Codex. It identifies AGENTS.md as a common format supported by all three tools, while noting each also has tool-specific instruction locations and scoping behavior, including Cursor rules and Copilot instruction files. The proposed approach is to place a clear verification contract in AGENTS.md that specifies when browser testing is required, the exact command to run, and how agents must interpret success and failure exit codes. The text recommends using a headless browser command such as TestMu AI’s Kane CLI, which accepts natural-language test objectives, drives Chrome, produces machine-readable results, and saves evidence including screenshots, network logs, and console output. It emphasizes that instruction files are advisory and can be ignored over long sessions, so teams needing guaranteed checks should add lifecycle hooks or required CI enforcement, and should first verify that their chosen instruction file is actually being loaded.

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