Remote-control tmux sessions for interactive CLIs by sending keystrokes and scraping pane output. Use when: (1) monitoring Claude/Codex sessions running in tmux, (2) sending input to interactive terminal applications, (3) scraping output from long-running processes inside tmux, (4) navigating tmux panes/windows programmatically, or (5) checking on background work in existing sessions. NOT for: one-off shell commands (use exec_command), starting new background processes (use background_process), or non-tmux interactive processes.