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Claude Code now detects the Zellij terminal multiplexer environment and reports it alongside TMUX and TERM_PROGRAM in diagnostic output. Some terminal features are gated to avoid conflicts with Zellij's own input handling.
New check process.env.ZELLIJ (search for "ZELLIJ") — qk_ at line ~199074
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.