[Bug] Antigravity Agent crash — HTTP 400 Invalid project resource name (projects/)

Google Antigravity
1

Hello,

I’m experiencing a critical issue with Google Antigravity IDE where
the agent terminates immediately with HTTP 400 Bad Request error.

Error message:
Invalid project resource name projects/

Details:

  • Trajectory ID: 753115b5-a7c9-4682-b279-…
  • TraceID: 0x6ec16ec95…
  • X-Cloudaicompanion-Trace-Id: 6ec16ec95f9abcd4
  • Date of error: Sat, 28 Feb 2026 08:34:54 GMT
  • Status: INVALID_ARGUMENT (HTTP 400)

What happens:
The agent sends requests to the Google Cloud AI Companion API
with an empty project ID (projects/ instead of projects/).
The agent crashes immediately on every attempt.

What I’ve tried:

  • Restarting Antigravity IDE
  • Signing out and back in
  • Starting a new chat session

Request:
Please re-provision the Antigravity project mapping for my account.
It appears the Cloud Project ID is not being correctly linked
to my account on the backend.

Thank you.

2

Hi @Gau_Hau ,

Thank you for bringing this to our attention. We have escalated the issue to our internal teams for a thorough investigation. Please follow for the updates in main thread.