most people downloaded Antigravity 2.0 and got confused at the first screen. here's the actual walkthrough and why the agentic mode setup is the most important decision you'll make before touching a prompt. SETUP: WHO'S DRIVING? when you first open Antigravity, the Agent Manager asks you to pick a development mode. this single choice defines the whole experience: → Agent-Driven (Autopilot) agent writes code, creates files, runs commands. no confirmation. use for greenfield projects or throwaway prototypes. → Agent-Assisted (Recommended) you stay in control. agent helps with safe automations. terminal policy: Auto for standard commands, Agent Decides for the rest. this is where most experienced devs should start. → Review-Driven agent asks permission before almost any action. use on production codebases where you need full audit trail. WHAT THE AGENT ACTUALLY DOES one prompt → the agent works across 3 surfaces simultaneously: editor → writes the code terminal → launches the app browser → opens Chrome, clicks through your UI, records video proof this is the part that's genuinely different from Cursor or Claude Code. the agent produces receipts. THE ARTIFACTS SYSTEM every task generates 4 artifacts. Google Docs-style, commentable: Task List — structured plan before any code is written Implementation Plan — technical architecture of what will change Code Diffs — exact lines changing, reviewable inline Walkthrough — summary + screenshots + browser recordings after done you don't have to trust "I fixed it." you get a video of the fix working. MODELS AVAILABLE Gemini 3 Pro, Gemini 3.5 Flash, Claude Sonnet 4.6, Claude Opus 4.6, GPT-OSS-120B. free during preview. Claude models need your own API key. PRO TIP BEFORE YOUR FIRST PROMPT create an initial Git commit and set the agent to commit incrementally. if the agent hallucinates a file structure or breaks a dependency, you revert in seconds. one developer saved 3 hours doing exactly this. this is a different mental model from a coding assistant. it's closer to hiring a contractor who sends you daily deliverables. what are you building first with it?