[Bug]: Antigravity CLI (agy) not detected on Windows despite working local quota API

[WayPointStack]

Existing issues

• I searched existing issues and did not find a duplicate.

What happened?

Ceiling 1.5.36 does not detect the standalone Antigravity CLI (agy.exe) on Windows, even though Antigravity is running, signed in, and its local quota API is working correctly.

Ceiling shows:

Antigravity needs sign-in
Provider not installed: Antigravity language server not running. Start Google Antigravity or run agy, sign in, then retry.

Environment:

• Windows 11
• Ceiling 1.5.36
• Antigravity CLI 1.1.25
• Google AI Pro personal account

I verified that agy.exe is running and listening on localhost.

I also called the Antigravity quota endpoint directly:

POST /exa.language_server_pb.LanguageServerService/RetrieveUserQuotaSummary

and received HTTP 200 OK with valid quota data for:

• Gemini weekly
• Gemini 5-hour
• Claude/GPT weekly
• Claude/GPT 5-hour

So authentication, the local Antigravity server, and the quota API are all working. Ceiling appears to be failing to discover or probe the running agy.exe process.

This looks related to #153 / #156, but in this case the issue is with the standalone Antigravity CLI on Ceiling 1.5.36.

Affected area

• Tray panel
• Settings UI
• Config file / settings persistence
• CLI
• Provider-specific behavior
• Installer / release packaging
• Startup / background behavior
• Other

Steps to reproduce

1. Install Antigravity CLI on Windows and sign in with a Google AI Pro account.
2. Start the CLI with:
   agy
3. Leave agy running.
4. Start or restart Ceiling 1.5.36.
5. Open Settings → Providers → Antigravity.
6. Ceiling reports:
   Provider not installed: Antigravity language server not running.
7. Verify separately that agy.exe is running and listening on localhost.
8. Send a POST request to:
   /exa.language_server_pb.LanguageServerService/RetrieveUserQuotaSummary
9. Observe that the request returns HTTP 200 OK with valid quota data, while Ceiling still does not detect Antigravity.

Logs, screenshots, or recordings

1. Start Antigravity CLI:
   
   agy

App version

1.5.36

Windows version

Windows 11 Pro 25H2

Additional context

No response

[btsouth]

Thanks for the detailed report. Ceiling does try to match a running agy.exe by image name, so CLI 1.1.25 probably renames the process or launches it differently than we expect. Could you run this in PowerShell with agy still running and paste the output?

Get-CimInstance Win32_Process | Where-Object { $_.Name -like '*antigravity*' -or $_.Name -like 'agy*' -or $_.Name -like '*language_server*' } | ForEach-Object { "$($_.ProcessId)`t$($_.Name)`t$($_.CommandLine)" }

That shows the exact image name and command line our detector needs to match. One more thing that would help: did you launch agy from a regular terminal or from WSL? A WSL-hosted agy.exe would look different to Windows.

[WayPointStack]

Thanks. I launched agy from a regular Windows PowerShell terminal, not WSL.

Requested process output:

45516   agy.exe   "C:\Users\<username>\AppData\Local\agy\bin\agy.exe"

[btsouth]

Thanks, that listing matches exactly what our detector looks for (agy.exe by image name, quoted path and all), so the failure is one specific step inside our detection chain rather than the match itself.

Could you run the built-in diagnostic with agy still running and paste the output? It's built to be safe to share, no tokens or emails in it:

& "$env:LOCALAPPDATA\Programs\Ceiling\codexbar-cli.exe" diagnose -p antigravity --pretty

That pinpoints which step reports the failure (process detection vs port discovery vs the quota fetch), and we'll fix that step directly.

[WayPointStack]

Thanks — here is the built-in diagnostic output with agy still running:

2026-09-07T21:41:33.454009Z  WARN codexbar::providers::antigravity: Antigravity probe failed: Provider not installed: Antigravity language server not running. Start Google Antigravity or run `agy`, sign in, then retry.
{
  "schema_version": 1,
  "timestamp": "2026-09-07T21:41:33.454501700Z",
  "diagnostics": [
    {
      "schema_version": 1,
      "timestamp": "2026-09-07T21:41:33.454499600Z",
      "provider": "antigravity",
      "display_name": "Antigravity",
      "source": null,
      "source_mode": "auto",
      "auth": {
        "configured": false,
        "modes": [
          "cli_supported"
        ]
      },
      "usage": null,
      "fetch_attempts": [
        {
          "kind": "auto",
          "was_available": false,
          "error_category": "config"
        }
      ],
      "error": {
        "category": "config",
        "message": "The provider's required local CLI or credentials were not found."
      },
      "settings": {
        "enabled": true,
        "source_mode": "auto",
        "cookie_source": "manual",
        "api_region": "",
        "supported_sources": [
          "auto",
          "cli"
        ]
      }
    }
  ]
}