Gemini CLI: Rapid Rise and Fall

When Google launched Gemini CLI in 2025, a tool for working with Gemini models directly from the terminal, it had no idea how quickly it would win over the community. Within a few months, it collected over 100,000 stars on GitHub, developers made more than 6,000 merged pull requests, and hundreds of volunteers contributed to its development. Gemini CLI became the standard for developers who wanted an AI assistant right in the command line — whether for quick answers, code generation, or cloud infrastructure management.

But developer needs have shifted, according to Google. While Gemini CLI was designed for one person collaborating with one model, today's projects require multiple agents communicating with each other, task splitting, and asynchronous processing. And that's exactly where Antigravity is headed.

Antigravity CLI: A Successor That Does More

The new Antigravity CLI is written in Go, which gives it significantly higher speed compared to the original Gemini CLI. The main difference, however, is the architecture: Antigravity CLI shares the same agent harness with the Antigravity 2.0 desktop application, meaning that all future improvements will automatically apply to both platforms.

What's new in Antigravity CLI:

• Asynchronous workflows: The tool can orchestrate multiple agents in the background while you do something else. You can kick off a large-scale code refactoring or search through multiple topics at once without blocking your terminal.
• Faster execution: Thanks to the Go rewrite, Antigravity CLI is snappier and more responsive even under demanding tasks.
• Unified architecture: The same settings, same permissions, and same agents work in both the CLI and the Antigravity 2.0 desktop application.
• Backward compatibility: The most important Gemini CLI features — Agent Skills, Hooks, Subagents, and Extensions — are available in Antigravity CLI as well (now as plugins).

What Changes for Developers — and When

Google has set June 18, 2026 as the key date. From that day on, Gemini CLI and the Gemini Code Assist IDE extension will stop serving requests for:

• Google AI Pro and Ultra users
• Free tier users (Gemini Code Assist for individuals)
• Gemini Code Assist for GitHub users (new installations on GitHub organizations)

For enterprise customers with a Gemini Code Assist Standard or Enterprise license, nothing changes — Google will continue to support Gemini CLI and the IDE extension with access to the latest Gemini models. They can try out Antigravity CLI right now with their Google Cloud projects.

How the Migration Will Work

Google promises the migration process will be as smooth as possible. Developers will find technical migration documentation on the official Antigravity website, and video tutorials will be released in the coming weeks. Most existing skills, MCP servers, and custom modifications from Gemini CLI can be transferred to Antigravity CLI using the provided tools.

Interestingly, conversations don't live separate lives between the CLI and the desktop app — they can be easily imported from the terminal into Antigravity 2.0 using the @conversation dropdown menu.

Bigger Picture: Unification Under Antigravity

The end of Gemini CLI is not an isolated decision. At I/O 2026, Google made it clear that Antigravity is becoming the unified platform for all developer tools around Gemini. From Antigravity 2.0 to the CLI to Antigravity in the cloud — they all share the same agent harness optimized directly for Gemini models. This also makes sense from a maintenance standpoint: instead of developing several parallel tools, Google focuses its efforts on a single ecosystem.

For Czech developers, this primarily means time to prepare. If you actively use Gemini CLI, you have about a month to migrate. Antigravity CLI is available for download right now and supports the same Gemini 3.5 Flash models that Google introduced at I/O — including agent capabilities and speeds up to 4× faster than competing models.

Availability for Czech Developers

Antigravity CLI is available immediately and for free to download from the official website. It is not regionally restricted in any way — Czech developers can use it just like anyone else in the world. The only limitation is that access to the latest Gemini 3.5 Pro models (arriving next month) will likely require a Google AI Pro or Ultra subscription, or an enterprise license.

For development teams at Czech companies, the key takeaway is that enterprise customers with a Gemini Code Assist license don't need to do anything — their existing setup remains valid even after June 18. However, if they want to take advantage of the new multi-agent workflow capabilities, it's worth trying out Antigravity CLI now.