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 The real unlock is getting agent setup down to ~15 lines. Once the runtime gets this thin, people stop demoing agents and actually start shipping them.

@xiaoyvLiu exactly !