What Is Google’s Antigravity CLI — and How Developers Should Migrate from Gemini CLI

# What Is Google’s Antigravity CLI — and How Developers Should Migrate from Gemini CLI?

Google’s Antigravity CLI is Google’s new, lightweight, keyboard-first Terminal User Interface (TUI) for Antigravity 2.0, designed to bring the platform’s core “agentic” capabilities—multi-step reasoning, multi-file edits, tool calling, and plugin-driven workflows—directly into a fast terminal experience. In practical terms, it’s the supported path forward for developers who previously relied on Gemini CLI, especially in SSH sessions and low-resource environments where a GUI isn’t ideal.

What the Antigravity CLI actually is

Antigravity CLI is positioned as the terminal-facing surface of the broader Antigravity 2.0 platform. Google’s framing is explicit: it’s a “lightweight Terminal User Interface (TUI)” that’s “optimized for speed, keyboard efficiency, and low overhead.” That focus shapes both the product design and the implementation.

Under the hood, Antigravity CLI is implemented in Go, and the goal is not just a nicer command prompt—it’s a snappy UI that can support asynchronous background workflows. The CLI surfaces the same core capabilities associated with Antigravity 2.0’s agent experience, including:

• Multi-step reasoning and iterative task execution
• Multi-file editing (important for real repo work, not just single-file snippets)
• Tool calling, including integrated tools and external hooks
• Conversation history and interaction management
• Support for Agent Skills, Hooks, Subagents, and Extensions, which are now rebranded as Antigravity plugins

If you’ve been tracking agent tooling shifts more broadly, this is part of the same “AI engineer workflow” push happening across platforms—see also our related context on evolving guardrails and workflows: Forge guardrails, Gemini 3.5 Flash, and the new AI engineer workflow.

How Antigravity CLI differs from the old Gemini CLI

A key point that prevents confusion: Google’s positioning is that both products run on the same core agent engine (the shared Agent Harness/Engine), meaning improvements in reasoning or tool use can apply across surfaces. The difference is the “front door” and what’s officially supported going forward.

Here’s what changes (and what doesn’t):

• Official terminal surface for Antigravity 2.0: Antigravity CLI is the terminal UI designed for the Antigravity 2.0 era, while Gemini CLI is being replaced.
• Rewrite in Go: Antigravity CLI is a new Go-based implementation, described as “snappier,” and aimed at higher performance plus async workflows.
• Shared settings and permissions: Antigravity CLI and Antigravity 2.0 sync settings and permissions, so you’re not managing separate policies in two places.
• Conversations are separate by default: CLI conversations don’t automatically appear in the desktop app—but they can be exported into Antigravity 2.0 when you want to continue in the richer desktop experience.
• Not 1:1 feature parity at launch: Google and community guidance is blunt here: it “retains our most critical features,” but “it’s not 1:1 feature parity at launch.” Core concepts (Skills, Hooks, Subagents, plugins) carry over, while edge-case workflows may require manual adjustment.

That last point is the practical difference that matters most for teams: migration is real work, even if the underlying agent engine is shared.

Key capabilities and architecture to understand

Antigravity 2.0 is described as a three-component architecture: Desktop App + Go-based CLI + SDK. Antigravity CLI is the terminal-facing piece, but it isn’t a toy client; it’s part of the same platform design where the agent layer and permissions model are consistent.

On performance, coverage around Antigravity 2.0 notes that the platform’s agent execution runs on Gemini 3.5 Flash, a model variant optimized for orchestration and advertised at about 289 tokens/second for agent execution (a platform-level metric referenced in the Antigravity 2.0 context). The practical takeaway: Antigravity CLI is built to take advantage of high-throughput agent execution for longer, multi-step workflows—particularly when you’re juggling tool calls or multi-file changes.

The platform also emphasizes managed execution: Antigravity agents run in managed Linux sandboxes at the platform level, which affects how tool access, remote workflows, and file I/O permissions behave when you move from older setups.

For a broader look at the infrastructure and operational considerations that tend to surface when teams operationalize agentic CLIs, see: AI infra & supply-chain: what to fix now (RDMA, repos, GCP, sovereign payments).

Practical migration steps from Gemini CLI

Because the CLI is changing and deprecation timelines matter, migration should be treated as a small project, not a casual upgrade. Based on the published guidance and community migration framing, a pragmatic sequence looks like this:

1. Back up your Gemini CLI state

Export or otherwise preserve conversations, configuration, and any custom extensions or integrations you depend on.

1. Inventory critical workflows before cutover

Since parity isn’t 1:1, list the features you must not lose (CI hooks, remote tool calls, specific extension behavior, etc.). This becomes your test checklist.

1. Use Google’s one-time import tool

Google provides a one-time import to migrate Gemini CLI extensions, Agent Skills, Hooks, Subagents, and settings into Antigravity CLI where supported.

1. Install Antigravity CLI and authenticate

Antigravity CLI is documented as cross-platform (macOS, Linux, Windows) with a one-liner install and documented authentication and onboarding steps.

1. Validate imported plugins and hooks

Because Extensions are now Antigravity plugins, confirm plugin configs and any managed connector/plugin (MCP) configurations behave as expected after import.

1. Run end-to-end tests for “agentic” workflows

Pay special attention to the things that tend to break in migrations: async background tasks, remote tool calls, and any CI-triggered flows.

1. For paid/enterprise usage, verify cloud and connector continuity

If your workflow depends on specific keys, Google Cloud integration patterns, or managed connectors, confirm those configurations continue to function ahead of any deprecation deadlines.

Common migration pitfalls (and how to mitigate them)

Two issues dominate most CLI platform transitions:

• Assuming parity: Because Antigravity CLI is not 1:1 at launch, teams should expect to adjust certain edge-case workflows. Mitigation is straightforward: create a short “must work” checklist and test in a staging environment.
• Plugin/connector mismatches: Custom plugins or connectors may need code changes to match Antigravity’s plugin APIs and security model. Mitigation: validate plugin behavior after import, and plan time for small refactors.

Also note the platform-level sandboxing and permissions model: tool access and sandboxed file I/O should be explicitly validated in a staging setup, particularly for remote workflows.

Why It Matters Now

This isn’t a theoretical upgrade cycle. Google has announced Gemini CLI deprecation for consumer users effective June 18, 2026, and Antigravity CLI is presented as the supported terminal path forward. For developers and teams, the “now” is about risk management: if you rely on Gemini CLI for daily development, remote SSH work, or CI integrations, waiting too long compresses the time you have to address the known non-parity gaps.

Separately, Antigravity 2.0’s agent execution running on Gemini 3.5 Flash (with the platform-level throughput figure cited at ~289 tokens/sec) underscores why Google is pushing the new surface: it’s built for higher-throughput orchestration workflows that don’t fit as cleanly into older CLI assumptions.

What to Watch

• Feature parity releases: Follow Google’s rollout cadence as Antigravity CLI closes gaps with legacy Gemini CLI workflows.
• Plugin API and MCP evolution: Watch for changes to plugin interfaces and security constraints that may affect custom integrations.
• Model variant updates: Changes to Gemini 3.5 Flash (and related variants like Pro) can shift throughput, latency, and cost characteristics for CLI-driven agent workflows.
• Deprecation policy changes: Monitor whether June 18, 2026 timelines shift, and whether any enterprise exceptions or extended support paths appear in official guidance.

Sources:

https://antigravity.google/docs/cli-overview

https://github.com/google-gemini/gemini-cli/discussions/27274

https://www.aimadetools.com/blog/antigravity-2-complete-guide/

https://deepwiki.com/google-antigravity/antigravity-cli/2-getting-started

https://byteiota.com/google-antigravity-2-0-what-developers-need-to-know/

https://www.aimadetools.com/blog/migrate-gemini-cli-to-antigravity-cli/