[BUG] Claude is blocked from executing sleep commands

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

I'm trying to have Claude launch my web application and interact with it but it takes a while to start up so Claude executes a command to first run Start-Sleep -Seconds 30 and then run Invoke-WebRequest which gets blocked.

What Should Happen?

Claude is able to wait before making the request to give the web application time to start up to prevent Claude falsely reporting issues.

Error Messages/Logs

● PowerShell(Start-Sleep -Seconds 30…)
  ⎿  Error: Blocked: Start-Sleep 30 followed by: try {
         $r1 = Invoke-WebRequest -Uri "https://localhost:44395/" -SkipCertificateCheck -UseBasicParsing
         Write-Host "HTTP OK — $($r1.StatusCode) "
     } catch {
         Write-Host "FAILED — $($_.Exception.Message)"
     }

Steps to Reproduce

Have Claude run powershell code like this:

Start-Sleep -Seconds 30
...

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.162 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

There are these two issues already #46144 #48280 both of which were closed without a real solution. I propose the same solution as in #46144.