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Power agent hubs or custom harnesses with the Antigravity SDK in one toolkit
Google released the Antigravity SDK, a toolkit enabling developers to build custom multi-agent control planes with integrated safety policies, telemetry, and persistence.
Why it matters
Developers can create custom AI agent environments that are easier to monitor and more secure than using fragmented logs, providing better oversight of autonomous agent behavior.
The big picture
The SDK provides the runtime engine used in the Antigravity CLI, which has previously been used for automating Cloud Spanner migrations.
The details
- Lifecycle hooks enable real-time streaming of agent transitions over WebSockets to dashboards. - Session trajectories and tool receipts are preserved in a root save_dir for auditability. - The runtime exposes three concurrent async iterators for visible text, internal thoughts, and tool calls. - Built-in tools for file and workspace operations are confined to authorized directories.
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In this article
Key connections
Antigravity SDK is related to Antigravity 2.0
The Antigravity SDK gives you the exact runtime engine used in Antigravity 2.0
Antigravity SDK is related to Antigravity CLI
The Antigravity SDK gives you the exact runtime engine used in Antigravity 2.0 and the Antigravity CLI
Antigravity SDK uses Gemini 3.1 Pro
The runtime that manages model interactions (like Gemini 3.1 Pro and Gemini 3.8 Flash)
Antigravity SDK uses Gemini 3.8 Flash
The runtime that manages model interactions (like Gemini 3.1 Pro and Gemini 3.8 Flash)
Antigravity SDK is related to Observability
Observability and telemetry middleware: An event-driven layer powered by Antigravity SDK Lifecycle Hooks
Antigravity SDK uses WebSockets
streams telemetry over WebSockets to your dashboard
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