I am experiencing persistent "503 / High traffic" and "Agent terminated" errors when trying to use Gemini models (3.1 Pro and Flash) in Antigravity IDE

Google Antigravity
,
1

1. Issue Description

I am experiencing persistent “503 / High traffic” and “Agent terminated” errors when trying to use Gemini models (3.1 Pro and Flash) in Antigravity IDE.

2. Key Observations

  • Claude works: Claude 3.5 Sonnet operates perfectly fine in the exact same workspace. The issue is isolated to Gemini models.
  • Quotas are intact: As you can see in the attached screenshot, my baseline quotas are almost full (Gemini Pro: 80%, Gemini Flash: 100%). This is clearly a server-side capacity/routing issue, not a personal quota limit.
  • Feedback Form is dead: I tried to submit a bug report via Settings -> Provide Feedback with server logs attached, but the form is stuck on “Submitting” infinitely. The internal telemetry seems to be down as well.

3. Proof

Please refer to the attached screenshot showing the exact 503 error alongside my available quotas. I could not extract the exact debug info because the internal UI became unresponsive. Please check the Gemini node capacity and routing for Antigravity.

image
image620×669 45.9 KB

2

i have the exact same issue since this morning ( 3h downtime )

Trajectory ID: 074a4ebf-9b1d-42e0-84c0-a51cf13b6
Error: HTTP 503 Service Unavailable
Sherlog:
TraceID: 0x5730a2df4953f7
…
…

{
“error”: {
“code”: 503,
“details”: [
{
“@type”: “type.googleapis.com/google.rpc.ErrorInfo”,
“domain”: “cloudcode-pa.googleapis.com”,
“metadata”: {
“model”: “gemini-3-flash-agent”
},
“reason”: “MODEL_CAPACITY_EXHAUSTED”
}
],
“message”: “No capacity available for model gemini-3-flash-agent on the server”,
“status”: “UNAVAILABLE”
}
}

3

Same error for me:
Trajectory ID: 59093e30-7143-4289-8906-
Error: HTTP 503 Service Unavailable
Sherlog:
TraceID: 0xfecd73b
Headers: {“Alt-Svc”:[“h3=“:443”; ma=2592000,h3-29=“:443”; ma=2592000”],“Content-Length”:[“419”],“Content-Type”:[“text/event-stream”],“Date”:[“Wed, 15 Apr 2026 17:24:40 GMT”],“Server”:[“ESF”],“Server-Timing”:[“gfet4t7; dur=352”],“Vary”:[“Origin”,“X-Origin”,“Referer”],“X-Cloudaicompanion-Trace-Id”:[“fecd73b7c49f0a5d”],“X-Content-Type-Options”:[“nosniff”],“X-Frame-Options”:[“SAMEORIGIN”],“X-Xss-Protection”:[“0”]}

{
“error”: {
“code”: 503,
“details”: [
{
“@type”: “type.googleapis.com/google.rpc.ErrorInfo”,
“domain”: “cloudcode-pa.googleapis.com”,
“metadata”: {
“model”: “gemini-3.1-pro-high”
},
“reason”: “MODEL_CAPACITY_EXHAUSTED”
}
],
“message”: “No capacity available for model gemini-3.1-pro-high on the server”,
“status”: “UNAVAILABLE”
}
}

4

Same error to me

Trajectory ID: 34355670-495b-4184-8850-
Error: HTTP 503 Service Unavailable
Sherlog:
TraceID: 0xf80b0062d7
Headers: {"Alt-Svc":["h3=\":443\"; ma=2592000,h3-29=\":443\"; ma=2592000"],"Content-Length":["525"],"Content-Type":["text/event-stream"],"Date":["Fri, 17 Apr 2026 01:55:07 GMT"],"Server":["ESF"],"Server-Timing":["gfet4t7; dur=707"],"Vary":["Origin","X-Origin","Referer"],"X-Cloudaicompanion-Trace-Id":["f80b0062d712bbb7"],"X-Content-Type-Options":["nosniff"],"X-Frame-Options":["SAMEORIGIN"],"X-Xss-Protection":["0"]}

{
  "error": {
    "code": 503,
    "details": [
      {
        "@type": "type.googleapis.com/google.rpc.ErrorInfo",
        "domain": "cloudcode-pa.googleapis.com",
        "metadata": {
          "model": "gemini-3.1-pro-high"
        },
        "reason": "MODEL_CAPACITY_EXHAUSTED"
      },
      {
        "@type": "type.googleapis.com/google.rpc.RetryInfo",
        "retryDelay": "53s"
      }
    ],
    "message": "No capacity available for model gemini-3.1-pro-high on the server",
    "status": "UNAVAILABLE"
  }
}