How to Test Code Written by Antigravity CLI (and Gemini CLI Before It)

AI coding agents such as Antigravity CLI and Gemini CLI can run headlessly in CI, produce JSON or NDJSON output, and edit code successfully without guaranteeing that the resulting application works in a browser. The text explains their differing modes, timeouts, permissions, and exit-code conventions, emphasizing that scripts should retain structured event streams and interpret tool-specific status information rather than treating all nonzero exits alike. It argues that builds, type checks, and unit tests may miss rendering, navigation, interaction, and third-party integration failures, so a browser-based verification step should follow agent-generated changes. Kane CLI from TestMu AI is presented as a command-line browser-testing tool that accepts natural-language objectives, runs them in Chrome, distinguishes assertion failures from environment and timeout errors, and saves screenshots, network logs, and console output as evidence. The proposed workflow is to have an agent modify code, build and locally serve the updated application, run a user-visible browser assertion against that fresh build, preserve artifacts, and return failures plus evidence to the agent for another repair attempt; a reusable Gemini skill can automate this verification behavior in interactive sessions.

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