You'll notice
Useful3 Signal1
Copying to the clipboard now works when you reach tmux over a socket rather than $TMUX.
What's wrong with this entry?
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TMUX
What
The tmux clipboard path used to give up unless the TMUX environment variable was set. It now also looks for an explicit attacher socket and passes it to tmux load-buffer, so copy works when Claude Code reaches tmux through a socket instead. If neither is found, there is still no clipboard support.
Evidence
attacher socket
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
Related
Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.