Google Antigravity: Migrating from VS Code to the Agentic AI Coding Fork

Google's Antigravity has arrived as a bold reimagining of Visual Studio Code, forked specifically to supercharge agentic AI coding. For developers accustomed to VS Code's ecosystem, the shift introduces both excitement and friction. This VS Code derivative aims to embed AI agents deeper into the coding process, potentially accelerating workflows in .NET, web development, and beyond. But as early adopters discover, the migration path reveals the trade-offs of diverging from Microsoft's flagship IDE.

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The Migration Challenge: No Seamless Sync

VS Code users cannot rely on Microsoft's official GitHub sign-in sync to port settings and extensions to Antigravity. Profile exports also fall short, forcing manual intervention. Instead, Antigravity provides built-in commands for importing configurations, a workaround that maintains continuity but underscores the fork's independence. *Source: [AppSoftware blog on Antigravity setup](https://www.appsoftware.com/blog/setting-up-google-antigravity-coming-from-vscode), published November 19, 2025.* This friction matters because VS Code's sync features have become table stakes for multi-machine workflows. Antigravity's approach signals a deliberate break, prioritizing AI-centric customization over backward compatibility. Developers must weigh whether the agentic AI gains justify the setup overhead.

Marketplace Switch: Trading Speed for Familiarity

By default, Antigravity points to the Open VSX marketplace (`https://open-vsx.org/vscode/gallery`), an open-source alternative to Microsoft's ecosystem. Early reports highlight performance lag, prompting users to pivot to the Visual Studio Marketplace:

  • Marketplace Item URL: https://marketplace.visualstudio.com/items
  • Marketplace Gallery URL: https://marketplace.visualstudio.com/_apis/public/gallery

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Access these via Ctrl + , (or platform equivalent), under the 'Editor' settings. This tweak restores access to a vast extension library, critical for polyglot developers. However, it doesn't solve every compatibility issue.

Extension Roadblocks: C# Dev Kit Locked Out

Even with the marketplace rerouted, Microsoft's C# Dev Kit remains unavailable. Antigravity, like rival AI IDE Cursor from Anysphere, is classified as a third-party fork—outside the licensing boundary for this powerful .NET toolchain.

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{
  "message": "C# Dev Kit is only supported in official VS Code instances"
}

.NET and C# developers, in particular, face a pivot. The post's author plans to test ReSharper for Visual Studio Code as an alternative, highlighting a broader trend: AI IDEs are forcing toolchain rethinking. Will Google address these gaps, or will developers cobble together open-source substitutes?

Why Antigravity Matters for AI-Driven Development

Antigravity isn't just another VS Code skin—it's a bet on agentic AI, where autonomous agents handle code generation, refactoring, and debugging. For .NET/web devs, the fork could streamline complex workflows, but only if setup hurdles don't erode productivity. As Google refines this tool, expect iterative improvements: faster marketplaces, broader extension support, and tighter AI integration.

The real test lies in adoption. If Antigravity delivers on its AI promise without alienating VS Code loyalists, it could fragment the IDE market further, giving developers unprecedented choice in an AI-accelerated era. Early movers like .NET teams will shape its trajectory, one settings import at a time.