[BUG] Antigravity IDE: HTTP 400 INVALID_ARGUMENT – Agent Manager sends empty GCP project name (projects/) on account load

Google Antigravity
1

Summary

The Antigravity IDE fails to start due to an HTTP 400 INVALID_ARGUMENT error. The backend Agent Manager is sending an empty GCP project string (projects/ instead of projects/<project-id>) to the Cloud AI Companion API, meaning the IDE cannot bind my Google account entitlement to the underlying automated GCP project. The IDE is completely unusable as a result.

Environment

  • Product: Antigravity IDE
  • OS: macOS (client)
  • Account type: Google AI Pro/Ultra subscriber
  • Date first observed: 24 February 2026

Observed Behavior

On IDE startup, the following HTTP 400 error is returned immediately from the Cloud AI Companion API:

HTTP 400 Bad Request
Message: Invalid project resource name projects/
Status: INVALID_ARGUMENT

Full error payload:

{
  "error": {
    "code": 400,
    "message": "Invalid project resource name projects/",
    "status": "INVALID_ARGUMENT",
    "details": [
      {
        "@type": "type.googleapis.com/google.rpc.BadRequest",
        "fieldViolations": [
          {
            "field": "name",
            "description": "Invalid project resource name"
          }
        ]
      }
    ]
  }
}

Diagnostic IDs (for backend lookup)

  • Trajectory ID: `0095b19c-c9b5-4b76-aebe-…
  • TraceID: `0xadc51569…
  • X-Cloudaicompanion-Trace-Id: adc51569bbce2eae
  • Server-Timing: gfet4t7; dur=682
  • Error timestamp: Tue, 24 Feb 2026 07:03:39 GMT

Steps to Reproduce

  1. Open Antigravity IDE
  2. Sign in with Google account
  3. IDE attempts to initialize the Cloud AI Companion API connection
  4. HTTP 400 error is returned immediately — IDE cannot load

Expected Behavior

The IDE should successfully resolve the GCP project associated with my account and load normally.

What I’ve Tried

This appears to be a server-side provisioning failure — the following local steps had no effect:

  • Setting GOOGLE_CLOUD_PROJECT and related environment variables
  • Re-running gcloud auth login
  • Clearing the IDE cache
  • Full reinstall of Antigravity IDE
  • Creating new workspaces
  • Signing in with a different Google account (unaffected account works fine)

Request

Could a Google engineer please manually reset and re-provision the Antigravity project mapping for my account? The Trajectory ID and TraceID above should be sufficient to locate the specific account instance on the backend. Thank you.