Google Optimizes Agent Development Kit's 200K-line Python Codebase Overnight with Gemini 4 Argon

Google ran an AI agent unattended for eleven hours to optimize its 200,000-line Python codebase. The agent produced two accepted pull requests that cut session overhead by 40 percent and cold package import times by 21 percent. Software engineers must still spend time testing and auditing these contributions, as reviewers rejected four other modifications submitted by the model.

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