Windows desktop: external-agent import becomes unstable and imported skills cannot be deleted

Summary

After importing setup and recent work from Claude Code and Claude Cowork into the ChatGPT/Codex Windows desktop app, the app became unstable and imported personal skills could not be removed.

Observed behavior

• The desktop app hangs or closes after sending a message and may return to the authorization screen.
• Resetting and reinstalling the app does not resolve the behavior after signing back in.
• Automatic import synchronization is disabled.
• All imported personal skills are disabled.
• Deleting an imported skill through Settings → Plugins → Skills → Delete returns "Failed to delete skill".
• Sending feedback from the desktop app also returns "Failed to send feedback. Please try again later."
• The imported skills are not present under %USERPROFILE%\.codex\skills; only the system skill directory is present.
• Windows Reliability Monitor records the desktop app as hanging / not responding rather than identifying a crashing module.

Expected behavior

1. Imported skills should be removable.
2. External-agent import should provide a complete undo action covering imported skills, sessions, settings, plugins, memories, and the import registry.
3. Disabling automatic synchronization should prevent removed imported items from being recreated.
4. Imported state should not destabilize the Windows app or invalidate its session.

Environment

• Windows desktop app installed from Microsoft Store
• Version shown in Windows reliability information: 151.0.7922.170
• Import sources: Claude Code and Claude Cowork

Troubleshooting attempted

• Reset the Windows app
• Uninstall/reinstall from Microsoft Store
• Sign out/sign back in
• Disable automatic import synchronization
• Disable all imported personal skills
• Restart the app
• Inspect %USERPROFILE%\.codex\skills
• Attempt deletion through the UI

Related reports

• #20662 — Windows settings crash while rendering external-agent import
• #21376 — imported external-agent sessions pollute/reindex desktop history
• #19372 — Claude plugin marketplaces are auto-discovered and can affect Codex

A supported account-level cleanup or complete undo-import action is needed because the imported skills cannot be removed locally or through the UI.

Start by reproducing the failure through Settings → Plugins → Skills → Delete, then inspect the imported-state location under %USERPROFILE%.codex\skills and the Microsoft Store app behavior after sign-in. Done means imported skills can be deleted, disabling synchronization does not recreate them, and the app remains stable after import cleanup.