libtmux:set-hook

Install tmux COMMAND-SOURCE for one registered hook and return an outcome. SCOPE/TARGET follow SET-OPTION. COMMAND-SOURCE is explicit tmux command language, not Lisp code; this function neither reads nor executes it locally. KEY selects one hook-array entry. APPEND applies to an unkeyed hook assignment; tmux does not append command source within a keyed hook entry. The ordinary install path never uses set-hook -R, but tmux may still run a registered native after-hook such as after-set-hook as a consequence of this set-hook command. Dynamic @ event sources require a live catalog that supports them. SET-OPTION rejects registered hooks; use UNSET-HOOK to remove this state. Never retries.