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docs: add gemini-cli deprecation notice (June 18, 2026 cutoff) + migration link - #21

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docs: add gemini-cli deprecation notice (June 18, 2026 cutoff) + migration link#21
MarcosNahuel wants to merge 1 commit into
abiswas97:mainfrom
MarcosNahuel:docs/deprecation-notice

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Why this PR

Google announced at I/O 2026 (May 19) that gemini-cli is being replaced by Antigravity CLI (agy), and stops serving requests for AI Pro/Ultra and free-tier users on June 18, 2026 — about 3 weeks from now.

Users hitting that cutoff will find their gemini-plugin-cc installs silently breaking. Right now this README has no signal that the underlying CLI is being deprecated, so users will only discover the issue when their workflows stop working.

This PR adds:

  1. A short factual deprecation notice at the top of the README (dated, with the cutoff and which tiers are affected vs unaffected).
  2. A link to an upstream-compatible Antigravity migration plugin (antigravity-plugin-cc) for users who want to keep their /<provider>:research-style workflow without breakage.

The plugin you maintain is excellent and was the direct inspiration for the migration. antigravity-plugin-cc mirrors its shape (slash-command-per-task, thin forwarder, no companion runtime) on top of agy instead of gemini-cli, with four extras for browser walkthrough recording, structured scraping, multimodal document conversion, and UX design review.

What this PR does NOT do

  • It does NOT remove or weaken any current docs.
  • It does NOT sunset gemini-plugin-cc for existing users — Gemini Code Assist for Enterprise and Vertex AI authenticated users keep working post-cutoff and this plugin remains useful for them.
  • It does NOT rebrand anything.

The notice is purely informational so users who Google "gemini-cli deprecated" land somewhere with guidance instead of being silently broken later.

Diff

One file changed: README.md — adds a > [!IMPORTANT] callout block right after the H1 title, before the existing intro paragraph. 12 lines added, 0 removed.

Sources

Happy to adjust wording, scope, or position of the notice — your call as the maintainer. If you'd prefer a different framing (eg. only call out the cutoff date without naming a specific migration target, or putting the notice at the bottom under a "Future" section), let me know and I'll update.

Thanks for maintaining this plugin — it's been a clean reference implementation.

…ation link

Google announced at I/O 2026 (May 19) that gemini-cli is being replaced by
Antigravity CLI (agy). Free-tier and AI Pro/Ultra users stop receiving
requests on June 18, 2026 — about 3 weeks from now.

Users hitting that cutoff will find their installs silently breaking, with
no signal currently in this README that the underlying CLI is being deprecated.

This adds a short factual notice with:
- The June 18, 2026 date and which user tiers are affected
- Which tiers are NOT affected (Gemini Code Assist Enterprise, Vertex AI)
- A link to antigravity-plugin-cc as an upstream-compatible migration target

No existing docs are removed or weakened. The notice is purely informational
so users who Google "gemini-cli deprecated" find guidance instead of being
silently broken later.

Sources:
- https://developers.googleblog.com/an-important-update-transitioning-gemini-cli-to-antigravity-cli/
- https://www.theregister.com/ai-ml/2026/05/20/bye-bye-gemini-cli-google-nudges-devs-toward-antigravity/
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