Plugin updates fail with Access is denied when other Copilot CLI or VS Code sessions are open

Description

Plugin updates fail when multiple Copilot CLI sessions or VS Code windows are open, even when the plugin is not actively invoked or being used by those sessions. The update appears to be blocked by file locks held by unrelated processes or sessions.

Impact

Updating a plugin currently requires closing and reopening every Copilot CLI shell and VS Code window. This is disruptive and can prevent urgent plugin updates from being applied promptly.

Observed error

Installing plugin "Agentic-Workflows@CalOps-Hub"...
Failed to install plugin: Failed to install plugin: Access is denied. (os error 5)

Expected behavior

Plugin updates should succeed when the plugin is not actively in use. If a file lock makes an immediate update impossible, Copilot CLI should identify the process or session holding the lock and provide targeted remediation, or support a deferred or atomic update without requiring all Copilot CLI and VS Code sessions to be closed.

Actual behavior

The update fails with a generic Access is denied (os error 5) message while other Copilot CLI sessions or VS Code windows are open, without identifying the locking process or offering a recovery mechanism.

Screenshot

No se nombra ningún archivo fuente ni ninguna prueba. Empieza reproduciendo la actualización con varias sesiones de Copilot CLI y ventanas de VS Code abiertas; después, sigue el punto de entrada de la actualización del plugin y el origen del error de Windows “Access is denied”. Se considera terminado cuando las actualizaciones tienen éxito mientras el plugin no se está utilizando, o cuando se informa claramente del proceso que mantiene el bloqueo y de una ruta de recuperación o de actualización diferida.