Error: spawn EINVAL

[kaiwenshen-vibing]

env: windows + vs code + codex setup properly and run properly

so i clicked understand project, and this happened.

is it because I only have codex? this error is very confusing, and based on your UI layout I guess 1 model works?

[kaiwenshen-vibing]

also tried gemini, this just takes forever

[BahaAbuNojaim]

Thank you @kaiwenshen-vibing, seems like it is not seeing the other agents, are any beside codex installed and working through the CLI?

Will investigate the issue

[kaiwenshen-vibing]

Hi @BahaAbuNojaim, yes, later on I installed gemini, gemini takes forever to answer through mysti.

it is basically jammed.

[BahaAbuNojaim]

@kaiwenshen-vibing will do our best to solve this asap

[kaiwenshen-vibing]

@kaiwenshen-vibing will do our best to solve this asap

let me know if theres anything i can help!

[nsxdavid]

Yeah I get the same thing. I have Claude Code, Gemini and CoPilot (all prior to this, all authenticated with plans).

UI seems to think they are avaialble, but none work.

First two were me trying Claude Code and Gemini. Then I tried Brainstorm and it just never does anything.

One other issue, the docs give incorrect information about how to authenticate Claude Code. It says to do:

claude auth login

But that isn't right. :)

[kaiwenshen-vibing]

Yeah I get the same thing. I have Claude Code, Gemini and CoPilot (all prior to this, all authenticated with plans).

UI seems to think they are avaialble, but none work.

First two were me trying Claude Code and Gemini. Then I tried Brainstorm and it just never does anything.

One other issue, the docs give incorrect information about how to authenticate Claude Code. It says to do:

claude auth login

But that isn't right. :)

good to know I wasn't the only one getting this error! hope it fixes soon.

[TerryFYL]

我的也是同样的情况，windows11，安装了Claude code，codex和gemini，然后Error: spawn EINVAL，Gemini 回答确实慢的流黄汤，vpn使用的台湾节点，规则模式，正常使用三个cli都没问题

[BahaAbuNojaim]

Thanks for reporting this! This is the same root cause as #10 — Windows .cmd wrappers cause spawn EINVAL errors.

Fix: Add this to your VSCode settings:

"mysti.useShellForCli": true

This tells Mysti to spawn CLI processes with shell: true, which correctly handles .cmd wrappers on Windows. The fix also includes Windows-specific path resolution for AppData\Roaming\npm and enriched PATH environment variables.

See #10 for full details. Thanks for helping us improve Windows support!

[ToXinE]

still not working despite adding the "mysti.useShellForCli": true to settings :(

[BahaAbuNojaim]

@ToXinE I will reopen the issue and will work on fixing it

[BahaAbuNojaim]

Fixed in v0.4.0: Auto-enable shell: true on Windows for all CLI spawns, which resolves the spawn EINVAL error with .cmd wrappers. Also added mysti.useShellForCli setting for manual control on other platforms. Shell argument safety validation is included to prevent injection.