Supported Gemini subscription access for a third-party VS Code extension?

Google Antigravity
2

Hi @Saksham_Chauhan,

Thank you for reaching out.

To give you an explicit confirmation so you can plan your architecture accordingly: there is no officially supported way for a third-party VS Code extension or application to use a user’s consumer Google AI subscription (such as Google AI Plus, Google AI Pro, or Google AI Ultra) or Antigravity login.

Here are the direct answers to each of your four questions:

  1. Consumer-Plan AI Access in Third-Party Extensions:

    • Not supported. Consumer Google AI plans and Antigravity logins are licensed exclusively for direct use within official first-party surfaces (Antigravity App, Antigravity CLI, Antigravity IDE, and official Antigravity IDE extensions).
    • Using third-party software, tools, or extensions to authenticate against Antigravity endpoints (FAQ: Third-party software with Antigravity login)—or wrapping agy headless mode (agy -p) inside a third-party application (FAQ: Headless mode in third-party tools)—violates the Antigravity Terms of Service and can result in account suspension or termination.

  2. Supported Interfaces & Authentication Methods for Third-Party Extensions:

    • Because consumer subscription pass-through is not offered (and there is no partner OAuth program for consumer Google One AI plans), third-party extensions should integrate via our developer platforms:
      • Gemini API via Google AI Studio: Allow users to configure their own Gemini API key (BYOK) from Google AI Studio, or route requests through your own backend using the Gemini API.
      • Google Cloud / Vertex AI: Support enterprise and cloud users via Google Cloud authentication and Vertex AI endpoints.

  3. Public Distribution & Commercial Licensing (Free Trial / Paid Closed-Source Extension):

    • You are welcome to publicly distribute a closed-source, free-trial or paid VS Code extension when built on top of the Gemini API (Gemini API Terms of Service) or Google Cloud Vertex AI (Google Cloud Terms). However, distributing a tool that uses consumer Antigravity OAuth tokens or wraps the agy binary is not permitted.

  4. Applicable Tiers, Models, and Usage Limits:

    • When using the Gemini API (either via user-supplied API keys or your own backend billing), model availability and rate limits follow the Gemini API Rate Limits and Pricing tiers rather than consumer Google One AI plans.

We hope this clear confirmation helps you design Code Review Workbench on a stable, officially supported foundation.