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Gemini CLI will stop working from June 18, 2026

developers.googleblog.com

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Re: Gemini CLI will stop working from June 18, 2026

#221

Anyone ever understand how the Gemini cli could be so bad even though Gemini 3 was so good?

Because the harness was bare bones. It takes a lot of under the surface work to make a really good harness to make a really good agent, independent of the LLM running.

The quality of the agent is 50% model quality and 50% harness quality.

Gemini CLI is a bare bones harness, whereas Claude Code and Antigravity are "batteries included" harnesses

Re: Gemini CLI will stop working from June 18, 2026

#222

agy cli is a disaster and half baked product. It wont even resize itself when i maximize terminal.

That's almost certainly an issue with your terminal than agy.

Though I do hate how most agents have standardized on terminal TUIs (despite being incorrectly called CLIs) precisely because terminals are a complete mess

Re: Gemini CLI will stop working from June 18, 2026

#223

> Gemini CLI is an open-source AI agent This is not good for open-source. Claude is not open-source, copilot-cli is not and antigravity-cli isn't either. Apparently the major players decide to keep the secret agent source, well, secret.

Because a lot of the value and development cost of an agent comes from the harness. So it makes sense to keep the harness code private, at least for now.

If/when everything stabilizes, we will probably see more open source. Agents are still very new and people are still figuring out the best way to make a harness

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