windows: console window flashes on every subprocess spawn (v2 next build)

Summary

On Windows, every time the agent runs a shell command (git, node, PowerShell, etc.), a console window briefly flashes open and then disappears. This happens for every command execution during a session.

Environment

opencode version: 0.0.0-next-17428
OS: Windows 11 Home 25H2, build 10.0.26200.8875 (win32 x64)
Terminal: TERM=xterm-256color, COLORTERM=truecolor (opencode TUI)
Shell: C:\WINDOWS\system32\cmd.exe
Install/channel: next (@opencode-ai/cli@0.0.0-next-17428)
Active plugins: herdr-agent-state.js, rtk.ts

Reproduction

Run opencode2 on Windows.
Ask the agent to perform any task that runs a shell command (e.g. git status, ls, or any command).
Observe a console window flash on screen each time a command runs.

Expected Behavior

Subprocesses spawned for shell command execution run silently with no visible console window.

Actual Behavior

A black console window briefly appears and closes for every subprocess spawn. This is caused by subprocess spawning on Windows not setting the CREATE_NO_WINDOW creation flag (windowsHide: true in Node.js, HideWindow: true in Go's syscall.SysProcAttr).

Additional Context

Service is healthy: opencode2 service status returns http://127.0.0.1:49374, /api/health returns {"healthy":true,"version":"0.0.0-next-17428"}.
Reproducible consistently.
Root cause is the same as the known v1 issues (Desktop app: Console window flashes repeatedly even while idle (CREATE_NO_WINDOW missing) #22414, Windows: subprocess spawn (git, codegraph, etc.) flashes console window #31629): missing CREATE_NO_WINDOW flag on Windows subprocess spawns. This report is for the v2 next build, where the flashing is still present.

This issue might be a duplicate of existing issues. Please check:

Windows: Console window flash on subprocess spawn — root cause analysis and solutions (CREATE_NO_WINDOW, S4U, conhost --headless) #38715: Windows console window flash — same root cause analysis (CREATE_NO_WINDOW / windowsHide / Go SysProcAttr), closed
Windows: subprocess spawn (git, codegraph, etc.) flashes console window #31629: Windows subprocess spawn flashes console window — same symptom, closed
Windows: bash tool spawns visible cmd.exe window on v1.15.12 (regression) #30315: bash tool spawns visible cmd.exe window on Windows — same symptom, closed
[FEATURE]:bash 工具支持 -WindowStyle Hidden 参数，让 PowerShell 窗口在后台静默执行 #38402: Related feature request for hiding PowerShell windows

If these prior reports cover your case, consider adding any new v2-specific details there or confirming the issue is still unresolved in the v2 next build (which your report does — thank you for the explicit version callout).

For Windows users, workaround for the tab focus-stealing: Windows Terminal → Settings → Startup → Default terminal application → Windows Console Host. The spawn then flashes as a detached window instead of hijacking your active terminal

@Egzza

@Egzza Is your main terminal Powershell 7? (pwsh.exe)

#45259

I can't reproduce that, can u do a video showcasing this?

Or which models are you using etc

No plugins. I replicated in other variables, but here my current setup for replication:

On windows 11
Open terminal, go to settings
Set Powershell 7 as the default profile (not microsoft powershell 5.x)
Set Microsoft Console Host as the default new terminal application
pwsh.exe (powershell 7+)
opencode2
Ask any claude or gpt model to grep "hello world" in the sub folders
Minimize to desktop to be sure it doesnt spawn under your window

I will screen record it later today if you still cant replicate it. Seen this issue in multiple discussions. No time right now

@neriousy

@neriousy I am chasing you across issues. I have been able to record these blinks. Sometimes they blink; sometimes they spawn and stay for 5-10 seconds. It's random, but I am pretty sure that there is some kind of logic behind it.

https://github.com/user-attachments/assets/1ba88a02-58fb-4bb0-9f51-d05b50b924c0
https://github.com/user-attachments/assets/a988d5ea-da93-4ba9-ad12-e7a601b012ce
https://github.com/user-attachments/assets/5921d069-7fac-431f-aec9-b4b6c13cae1e

@PVLPM

Heey - do you have any old plugins? Like did you use omo? @PVLPM

Try to clean up your .opencode/plugins folder

@neriousy

@neriousy
My ".config\opencode\plugins" is empty except that I had bun-preload.ts, which was a workaround when OpenCode moved from Tauri to Electron, and I couldn't use the desktop because of the "bun is not defined" issue (I also reported that at that time). Here is a brief description of bun-preload.ts file:

 * Bun API polyfill for OpenCode Desktop (Electron/Node.js).
 *
 * OpenCode Desktop runs its server inside Electron's bundled Node.js,
 * NOT Bun. Plugins that reference Bun.* globals (Bun.env, Bun.write,
 * Bun.file, $, etc.) crash with "Bun is not defined".
 *
 * This preload plugin defines those globals with Node.js equivalents
 * before any other plugin code runs. Place it FIRST in the plugin array.

I removed it, restarted OpenCode, and got bombarded by those blinks, like 20-30 in 2-3 seconds, lol.
Plugins list:

  "plugin": [
    "oh-my-opencode-slim",
    "C:\\Users\\User\\.hindsight\\coding-agents",
    "superpowers@git+https://github.com/obra/superpowers.git"
  ],

All plugins updated to comply with v2.

I am still using the v1 config. Is that a thing?

UPD: And yes, the videos were recorded on 2.0.21.

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windows: console window flashes on every subprocess spawn (v2 next build) #42440

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windows: console window flashes on every subprocess spawn (v2 next build) #42440

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github-actions commented on Aug 13, 2026

gabparrot commented on Aug 24, 2026

gabparrot commented on Aug 25, 2026

gabparrot commented on Aug 26, 2026

neriousy commented on Aug 26, 2026

neriousy commented on Aug 26, 2026

gabparrot commented on Aug 26, 2026

gabparrot commented on Aug 26, 2026

PVLPM commented on Oct 1, 2026

neriousy commented on Oct 1, 2026

neriousy commented on Oct 1, 2026

PVLPM commented on Oct 1, 2026

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