Pour one out for Gemini CLI. Google announced this week that on June 18, 2026, it will pull the plug on its open-source development agent for most users, replacing it with a shiny new tool called Antigravity CLI โ€” and here's the kicker: it's not open source. The search giant unveiled Antigravity at Google I/O as part of an effort to unify its command line interface strategy for AI agents. But the transition comes with strings attached that have the developer community fired up.

What's Getting Axed

Starting June 18, Gemini CLI and Gemini Code Assist IDE extensions will stop serving requests for Google AI Pro, Ultra, and free tier users. The same cutoff applies to Gemini Code Assist for GitHub โ€” no new installations after that date, with existing setups going dark in the following weeks. Enterprises aren't sweating this change, though. Users holding Gemini Code Assist Standard or Enterprise licenses can keep chugging along without interruption, as can those accessing tools through enterprise Google Cloud accounts.

The Open-Source Bait-and-Switch

Here's where it gets ugly. Gemini CLI was an Apache 2.0 licensed project โ€” you could crack open the repo and see every line of code powering your AI coding assistant. Head over to the Antigravity CLI GitHub page today and you'll find a changelog, a readme, and a GIF demo. That's it. No source code. Google hasn't published the underlying codebase, which means developers are being pushed toward a black box they can't audit, fork, or self-host. The community noticed immediately, and the backlash on GitHub has been swift and pointed.

Feature Parity? Don't Count On It

Google was upfront that there won't be '1:1 feature parity right out of the gate' between Gemini CLI and Antigravity CLI. Agent skills, hooks, subagents, and extensions are all supported at launch โ€” but plenty of other functionality may arrive late or never. Usage limits are another flashpoint. Multiple developers reported hitting their weekly quota with just a couple of requests, and the issues page for Antigravity is littered with posts begging Google to address throttling. This is a rough look for a tool positioning itself as the future of AI-assisted development.

You Can Still Have Gemini CLI โ€” For A Price

Gemini CLI Lead Product Manager Dmitry Lyalin took to GitHub to explain the transition, and he left the door cracked open for paying customers: 'The project remains available to the community as an Apache 2.0 licensed repository with no changes. You will continue to see us work on GitHub as we keep Gemini CLI updated with latest model releases, bugs and security fixes for our enterprise customers.' Translation: the code's still there if you've got paid API keys or enterprise contracts. Everyone else? Antigravity or nothing.

Key Takeaways

  • June 18, 2026 is your cutoff date unless you're on an enterprise plan or paying for API access
  • Gemini CLI was Apache 2.0 licensed; Antigravity CLI source code hasn't been published
  • Feature gaps are expected at launch โ€” don't assume a smooth migration
  • Developers are already reporting aggressive usage limits with the new tool

The Bottom Line

Google just pulled a classic move: let the community build something useful on an open license, then yank it behind a paywall and replace it with closed-source infrastructure. If you're depending on Google's AI dev tooling, start hedging now โ€” because 'don't be evil' has clearly become 'don't be surprised when we alter the deal.' The open-source community built Gemini CLI into something real, and Google's return gift is a black box with rate limits.