Gemini CLI Discontinuation & Migration
Gemini CLI is being discontinued
Google is retiring account login for Gemini CLI (Pro / Ultra / free tiers) on June 18, 2026. After that date, signing in with your Google account will stop working in Gemini CLI.
According to Google, Gemini CLI stays accessible via a paid Gemini API key, so the reliable way to keep using Gemini in this plugin is a paid API key.
What's changing
On June 18, 2026, Gemini CLI will stop serving requests for account-login tiers. This is part of Google's transition from Gemini CLI to the new Antigravity CLI, announced at Google I/O 2026.
Account login (signing in with your Google account) is what stops — but Google also points to a way to keep using Gemini CLI:
"Gemini CLI will remain accessible via paid Gemini and Gemini Enterprise Agent Platform API keys." — Google Developers Blog
Note that Google's wording specifies a paid API key. The blog does not state whether a free-tier API key will keep working with Gemini CLI after the cutoff, so free-tier continuation is not guaranteed. This plugin drives Gemini CLI with an API key, so a paid API key is the dependable path forward.
Who is affected
| Tier / access | Still usable after June 18, 2026? |
|---|---|
| Free tier (account login) | ❌ No — account login stops |
| Google AI Pro (account login) | ❌ No — account login stops |
| Google AI Ultra (account login) | ❌ No — account login stops |
| Gemini CLI via a paid API key | ✅ Yes — keeps working |
Note
Being on a paid plan (Pro or Ultra) does not exempt you — the cutoff is about the account-login method, not whether you pay. The reliable way to keep going is a paid API key (see below).
How to keep using Gemini in this plugin
Option A — Use a paid Gemini API key (recommended)
- Create an API key in Google AI Studio and enable billing to move it to a paid tier. This is the access Google explicitly says keeps working.
- Configure the key in this plugin by following the Gemini CLI Setup page (Option B: API key, or Option C: Vertex AI).
About the free tier
The Gemini API has a free tier, and as of writing models such as gemini-2.5-pro and gemini-3.5-flash show as free of charge on the pricing page. However, Google's announcement only guarantees access via a paid API key — it does not say a free-tier key will keep working with Gemini CLI after June 18, 2026. A free key may work, but it is not guaranteed; if you need reliability, use a paid key. Rate limits for any tier can be checked in the AI Studio rate-limit dashboard.
Privacy note
A paid API key also helps with privacy. Agent Client can send your note contents to the model as context, and on paid tiers Google does not use that data to improve its products: "When you use Paid Services, Google doesn't use your prompts ... or responses to improve our products." (If you ever fall back to a free-tier key, note that free/unpaid usage can be used for product improvement and human review.) Source: Gemini API Additional Terms of Service.
Option B — Switch to another ACP agent
This plugin works with any agent that speaks the Agent Client Protocol (ACP). If you'd rather move off Gemini entirely:
What about Antigravity CLI?
Google's replacement, Antigravity CLI, does not currently support ACP (there is no --experimental-acp mode), so this plugin cannot connect to it as a built-in agent yet. Antigravity CLI is also not open source.
If Google adds ACP support — or if an adapter built on the Antigravity SDK emerges (similar to how claude-agent-acp is built on the Claude Agent SDK rather than wrapping the CLI) — built-in support will be reconsidered. For Google's own migration steps, see the Antigravity CLI migration guide.
A community ACP bridge, agy-acp, does exist and can be added as a custom agent. It works as a minimal text chat only — streaming, tool calls, and diffs don't come through — so it's an escape hatch rather than a full replacement.
Questions?
If anything is unclear or you run into trouble migrating, join the discussion on GitHub.