doctor

cyber-mux doctor

Probe the multiplexer, your self pane, and the resolved backend. Prints the detected multiplexer, how it was detected (via), the current pane id, the resolved backend name, and — when a self pane was found — a ready-to-export CYBER_MUX / CYBER_MUX_PANE pair that pins the fast-path and skips detection on the next run:

multiplexer: tmux
detected via: env
pane: %3
backend: tmux

Pin the fast-path to skip detection:
  export CYBER_MUX=tmux CYBER_MUX_PANE=%3

Never fails on “no multiplexer” — outside one, backend reads none rather than erroring.

Accepts --format text|json|agent. See mode for the one-line version.

Examples

cyber-mux doctor

# Pin the fast-path in your shell profile, skipping detection on every future run
eval "$(cyber-mux doctor | grep '^  export')"

# Machine-readable form
cyber-mux doctor --format json
# {"mux":"tmux","via":"env","pane":"%3","backend":"tmux"}