Google Antigravity 2.0: CLI, SDK, and Managed Agents Guide

Google launched Antigravity 2.0 at I/O 2026, a new developer tool that replaces the Gemini CLI, which stopped working on June 18. The update introduces five new surfaces, including a CLI, SDK, and managed agents, marking a significant shift in Google's developer tooling.

Google didn’t just update its developer tooling at I/O 2026 — it shipped five products simultaneously, killed Gemini CLI on a hard deadline, and handed developers a new binary that does things its predecessor never could. If you haven’t migrated yet, your Gemini CLI stopped working on June 18. But the migration drama is a distraction. The bigger story is that Antigravity 2.0 is a genuinely different class of tool, and most developers haven’t noticed because they’re focused on the binary rename. What Google Actually Shipped Antigravity 2.0 is not a renamed Gemini CLI. Google launched five surfaces at once: … The post