You'll notice
Serving a folder that's already served elsewhere on the device now gives a clear error instead of a generic one
What
When registering a folder to be served (shared for remote access) fails because that same folder is already being served by another instance of Claude Code on the same device, the error is now recognized specifically and shown as a clear message telling the user to stop the other instance first, instead of falling through to a generic registration-failure message.
Why
This makes it obvious what actually went wrong and what to do about it, instead of leaving the user to guess at a generic error.