Human validation vs agent validation: put the burden of proof on the agent
Blog post from Expo
Agent validation shifts responsibility for demonstrating that an app fix works from human reviewers to the agent that made the change, requiring evidence such as before-and-after screenshots, end-to-end recordings, timestamped action logs, and links to runnable simulator builds in each pull request. This approach can accelerate reviews by letting agents reproduce bugs, test multiple user states and screen sizes in parallel, and perform repeatable structural accessibility checks, while human reviewers retain responsibility for judging design intent, implementation quality, user experience, risk, and whether to merge. To reduce the risk of self-confirming tests, the text recommends separating the agent that writes a fix from one that validates it, ideally through agentic CI. Teams are advised to begin with a proof-required policy, measure its effects on review time and returned pull requests, write precise verification requirements, improve accessibility labels, and establish retention rules for recordings. Expo Simulators and EAS are presented as tools for running cloud-based simulator sessions, collecting evidence, and enabling reviewers to interact with builds, though Android support and the limited-beta status may impose constraints.
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