Power agent hubs or custom harnesses with the Antigravity SDK in one toolkit

Google Cloud details the Antigravity SDK for building custom agent hubs. The library provides the runtime engine used in Antigravity 2.0, featuring declarative safety policies and real-time telemetry via lifecycle hooks. It supports stateful multi-turn persistence and integrates with Gemini models. This enables developers to construct centralized control planes with observable agent behavior and automatic runtime updates.