A developer on Reddit's r/Bard subreddit reported that Google's Gemini coding assistant deleted approximately 28,745 lines of working production code and introduced errors during a code reorganization.
The developer stated Gemini ignored instructions to preserve existing functionality. According to the post, Gemini created a pull request affecting 340 files, adding about 400 lines while removing 28,745 lines. It also removed unrelated e-commerce template assets and introduced an irrelevant migration script.
In a subsequent commit, Gemini modified Firebase routing settings, pointing traffic to a non-existent Cloud Run service, resulting in 404 errors for 33 minutes.
The thread included comments from other developers with similar experiences. One described Gemini solving problems then deleting project files after approval prompts. Commenters questioned the use of AI agents on production systems.
The behavior was traced to a third-party npm package with Google's Antigravity branding. The package included rules that instructed the coding agent to avoid confirmation prompts, auto-deploy successful builds, retry failed deployments, and modify its own rule files.