{"name":"TMUX_PANE","slug":"tmux-pane","family":"env","title":"Environment variables","noun":"environment variable","description":"The tmux pane Claude Code runs in. When `TMUX` is also set, Claude Code asks `tmux display-message` for this pane's `session:window.pane` address and stores it as `tmux` in its session pid file. The tmux teammate backend uses it as the current pane id and as the target when looking up the leader window, and falls back to asking tmux when it is unset.","description_source":"code","described_by":{"bundle":"2.1.286","author":"claude-opus-5-5"},"presence":{"first_seen":"2.1.138","removed_in":null,"in_current_build":true,"newest_mined":"2.1.308","builds":149,"mined_builds":149,"first_cited":null},"aliases":[],"entries":[],"entries_total":0,"docs":[],"docs_total":0,"gates":[],"related":[{"name":"TMUX","slug":"tmux","description":"More environment variables go through the central registry that handles allowlisting and scrubbing."}],"url":"https:\/\/changelogs.core-directive.com\/reference\/env\/tmux-pane","family_url":"https:\/\/changelogs.core-directive.com\/reference\/env.json"}