Beyond Autocomplete: Building My Portfolio with Google Antigravity
I remember the first time I used an autocomplete tool; it felt like magic. But as we move deeper into 2026, that "magic" has started to feel like a chore. I was tired of being the middleman between my editor, my terminal, and my browser. Then I found Google Antigravity.
Announced in November 2025 alongside the release of Gemini 3, Antigravity isn't just another code editor — it's an AI-powered IDE where AI agents do the work while I simply act as the architect. In fact, if you've been following my recent updates, some parts of this website you are currently on are also refined and tested using this tool.
The Problem I Was Trying to Solve
Before Antigravity, I used traditional AI coding tools like GitHub Copilot. They were helpful, but they only autocompleted lines. I still did the heavy lifting — switching between my editor to write code, the terminal to run migrations, and the browser to check the UI.
Antigravity allows me to offload these end-to-end tasks. The agent handles the full "write → run → test → fix" loop autonomously. It's a total shift from writing every line to managing an autonomous crew.
Inside My "Mission Control"
What makes Antigravity stand out is the Agent Manager. I can assign high-level tasks and monitor agents working in parallel.
Here are the key features that transformed my recent portfolio updates:
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Two Work Modes: I use Plan mode for complex structural changes to generate a roadmap first, and Fast mode for instant execution of quick fixes.
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Browser Agent: This agent doesn't just "see" the web; it interacts with it — clicking, scrolling, typing, and even recording videos of bugs.
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Artifacts: These are tangible deliverables like task lists, implementation plans, or screenshots. I can leave feedback directly on an Artifact, and the agent incorporates it without stopping.
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Skills: These are specialized knowledge packages that stay dormant until the agent needs them for a specific request.
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Multi-Model Support: I'm not locked in. I can switch between Gemini 3.1 Pro, Claude Opus 4.6, or GPT-OSS-120B depending on the complexity of the task.
A Complete Real-World Example: The Coupon Feature
To see all these agents in action, I tasked Antigravity with adding a coupon code feature to a checkout page.
Phase 1: Planning (Claude Opus 4.6)
I gave a single prompt. The Agent Manager broke the task into a detailed Plan Artifact. It identified that I needed a new database table, a validation endpoint, and a specific UI placement for the input field.
Phase 2: Execution (Gemini 3.1 Pro & Sonnet 4.6)
The Coding Agent switched to Gemini Pro for speed to create the SQL migrations. A Skill triggered automatically to ensure the migration file was placed in the correct /db/migrations folder.
The Terminal Agent then ran the migration and seeded the database. For the UI, the model switched to Claude Sonnet 4.6 to match my design requirements exactly.
Phase 3: QA Testing (Browser Agent)
Once the Terminal Agent confirmed the server was live, the Browser Agent opened a real Chrome window. It tested a valid coupon (checking if the total dropped), an invalid coupon, and an expired coupon. It even captured screenshots of each state as "proof" in the Artifacts window.
My Honest Review: Pros & Cons
Antigravity is currently in public preview, and while it's revolutionary, it has its quirks.
The Strengths:
- It is completely free during the preview phase.
- The agents learn from my feedback and past work, improving over time.
- The Artifacts provide full transparency into exactly what the agent did.
The Limitations:
- Performance: It is a heavy app. I've found online that Antigravity drains battery and there's occasional input lag while the agent is generating. However, this is still based on early reports — it may or may not have been resolved since.
Final Recommendation
If you're a beginner, this is the best way to learn agentic AI concepts with zero cost. For intermediate and advanced developers, it lets you build faster by offloading the "grunt work."
My Action Steps for You:
- Download the installer from antigravity.google.
- Configure the Agent Manager to "Agent-assisted development" to stay in control while the AI automates safe tasks.
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