[BUG] Claude Code Desktop always shows Powershell tool calls as "Using Powershell" instead of showing provided description

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?

When Claude (regardless of model used) makes a tool call involving Powershell, the Claude Code Desktop app on Windows always shows the tool's headline/summary as "Using Powershell" or "Used Powershell":
<img width="1476" height="421" alt="Image" src="https://github.com/user-attachments/assets/3c60f3f7-fabc-40d4-aea9-6d6350ec30e1" />

This is always the case, regardless of the description field that Claude has provided in the tool call:
<img width="1489" height="375" alt="Image" src="https://github.com/user-attachments/assets/56690800-9e0e-4778-a589-23373f810a08" />

What Should Happen?

Tool headlines should show the Claude-provided headline, like when Claude uses Bash:
<img width="1471" height="167" alt="Image" src="https://github.com/user-attachments/assets/185276ed-e6d7-42a7-8afd-293b686163e9" />

Error Messages/Logs

Steps to Reproduce

1. Launch the Claude Code Desktop app on Windows
2. Open a New session in a project which allows the Powershell tool
3. Ask Claude to use Powershell and run Get-Date with a description "Frobnicating thingamajigs"
4. Observe how tool call headline says "Using Powershell" instead of "Frobnicating thingamajigs": <img width="839" height="457" alt="Image" src="https://github.com/user-attachments/assets/16d982bf-e5b5-430a-9532-12e0e877e26c" />

To verify the Bash claim, ask Claude to do the same (except run date instead of Get-Date) in a project allowing the Bash tool and observe how the title is "Ran Frobnicating thingamajigs":
<img width="816" height="460" alt="Image" src="https://github.com/user-attachments/assets/99cbbb69-8d49-4bb5-9dbb-79e0ad319cf5" />

Claude Model

Not sure / Multiple models

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

Claude Code version: 2.1.197 (commit c8fd8048f30950a21d28734718275aa7e97f5143, built 2026-06-29); Desktop app package: 1.18286.0.0 (Windows MSIX)

Platform

Other

Operating System

Windows

Terminal/Shell

Other

Additional Information

In case it's relevant:

• I am running Claude Code Desktop on Windows 11, build 26200
• The Powershell tool is using pwsh.exe with Powershell version 7.6.0, PSEdition Core - it's not using the built-in Powershell
• I have not confirmed whether this also happens in the Claude Code CLI - this report is only about the Desktop app
• I have not confirmed whether this also happens on the recently released Linux version of the Desktop app - this report is only about the Windows version of Claude Code Desktop