Google Antigravity SDK just dropped. 15 lines of Python → working AI agent. Same runtime as Antigravity 2.0. Apache 2.0 licensed. MCP server support built in. Gemini 3.5 Flash as default model. the runtime improvement flywheel is the real story: Google improves the platform → your SDK agents improve automatically. Claude Code, Codex, now this. which one are you actually building on?

@BuildFastWithAI 15 lines to a working agent is a great demo, the honest line count once you add auth, error handling, and observability is closer to 500. The SDK pattern is right but the runtime story matters more than the LOC.

@saen_dev true