[Bug] Eligibility check failed in Antigravity CLI v1.1.5 and IDE despite active Google AI Pro subscription and successful OAuth

Google Antigravity
1

Summary

I am unable to use the Antigravity CLI or the Antigravity IDE with my personal @gmail.com account, despite having an active Google AI Pro subscription.

When authenticating via the browser link provided by the CLI/IDE, the OAuth flow completes successfully and displays:
"The authentication was successful, and the following products are now authorized to access your account: Gemini Code Assist, Cloud Code with Gemini Code Assist, Gemini CLI, Antigravity..."

However, the moment I send a prompt in either the CLI or the IDE, the session drops and throws an eligibility check failure. Because this happens across both the standalone terminal and the full IDE, it appears to be a backend desync where the developer endpoint is failing to read my Google AI Pro entitlement.

Environment

  • Account Type: Personal Google Account (@gmail.com) with active Google AI Pro plan
  • Operating System: Arch Linux (Rolling Release)
  • Kernel: 6.18.38-1-lts (because why not)
  • Antigravity CLI Version: 1.1.5
  • Antigravity IDE Version: antigravity-ide 2.1.1-1 (installed from AUR via yay)
  • Model Selected: Gemini 3.6 Flash (High)

Steps to Reproduce

  1. Launch Antigravity CLI (agy) or open the antigravity-ide desktop environment using an active Google AI Pro personal account.
  2. Follow the generated OAuth authentication link (https://accounts.google.com/signin/continue?``...).
  3. Complete any required verification in the browser. Receive the “Authentication successful” confirmation page.
  4. Return to the terminal or IDE and submit any prompt (e.g., > hello).

Expected Behavior

The CLI and IDE should initialize the agent session and respond to the prompt using my Pro subscription quota and selected model (Gemini 3.6 Flash).

Actual Behavior

The prompt is blocked immediately with the following error output:

> hello

⚠ Eligibility Check
⎿  Eligibility check failed: Your current account is not eligible for Antigravity. Verify your account to continue.

Alternatively, try signing in with another personal Google account.

Please verify your account in your browser to continue:
[https://accounts.google.com/signin/continue](https://accounts.google.com/signin/continue)?...