[BUG] /agents view on Windows leaks orphan Windows Terminal XAML host on exit (taskbar tile reading "DesktopWindowXamlSource")

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?

## Summary

After using the /agents view in Claude Code on Windows, closing the
Claude Code session leaves an orphan Windows Terminal process. The
orphan registers a separate taskbar tile labeled
"DesktopWindowXamlSource" (the fallback class name shown when the
window's AppUserModelID isn't properly set). The orphan window is
DWM-cloaked (invisible to the user), but visible in the taskbar.
Right-clicking the tile shows a normal Windows Terminal jump list
(PowerShell, Command Prompt, Azure Cloud Shell, Git Bash) plus a
"Close window" entry, confirming it is a real Windows Terminal
process.

## Environment

• OS: Windows 10 Enterprise N LTSC 2021, version 10.0.19044
• Claude Code: 2.1.142
• Windows Terminal: 1.24.11321.0 (MSIX)
• Shell: PowerShell 7.6.1
• Model in use: Opus 4.7 (1M context)

## Reproduction

1. Open Windows Terminal.
2. Run claude to start a Claude Code session.
3. Type /agents to open the agents view at least once during the

session.

1. Exit Claude Code normally.
2. Observe: a new tile labeled "DesktopWindowXamlSource" appears on

the taskbar. Clicking it does nothing visible. Right-click reveals
a Windows Terminal jump list and a "Close window" option.

The orphan reappears every time /agents is used, on every session
close.

## Expected behavior

The XAML host created by /agents view should be disposed when the
view closes (or at the latest when the Claude Code session exits).
No orphan window or taskbar tile should remain.

## Diagnostic notes

• Restarting explorer.exe does NOT clear the tile — the underlying

window is real, not a cache artifact.

• Clearing iconcache*.db / thumbcache*.db does NOT help, same

reason.

• A EnumWindows sweep filtering on IsWindowVisible() == true does

not surface the orphan because it is DWM-cloaked. A broader sweep
(no visibility filter, dumping class + title for all top-level
windows) is the correct way to detect it.

• The jump list and "Close window" option in the tile's context menu

confirm the orphan is a WindowsTerminal.exe process distinct from
the user's active terminal.

• Manual workaround: right-click the tile → "Close window" cleans up

the current orphan but the leak recurs on next session close.

## Suspected cause

The /agents view spawns or hosts a XAML Island in a Windows Terminal
host window without inheriting Windows Terminal's
AppUserModelID, and does not dispose the host on exit. Windows falls
back to the XAML class name "DesktopWindowXamlSource" for the tile
label because no AUMID was set.

## Workaround in use

Avoiding /agents view. Right-click → Close window when the tile
appears.

What Should Happen?

closing claude code should't leave a "DesktopWindowXamlSource" tile on my windows taskbar.

Error Messages/Logs

no error, just a "DesktopWindowXamlSource" tile on my taskbar that doesn't open anything

Steps to Reproduce

closing claude code leaves a "DesktopWindowXamlSource" on my taskbar

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

latest

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

_No response_