I am getting persistent HTTP 503 errors using gemini-3-flash-agent in Antigravity.
Error:
MODEL_CAPACITY_EXHAUSTED
No capacity available for model gemini-3-flash-agent
Trajectory ID: 119bd8a9-6407-40a3-8778-
TraceID: f52088e76
Important context:
- Happens only on my Ultra account
- Works with a free account
- Not related to project or billing
- Blocks agent workflows completely
Is this a backend routing or capacity pool issue for this account?