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- /shell [cmd]: launch user's $SHELL via tea.ExecProcess (PTY handoff) hands terminal to the shell and restores TUI on exit. /shell <cmd> runs that command in the shell directly. Detects $SHELL > $COMSPEC > /bin/sh|powershell.exe in order. - bash tool: detect interactive commands before execution Prefix-interactive: sudo, ssh, passwd, vim/vi/nano, less/more, htop/top, mysql/psql, ftp/sftp, git push. Exact-interactive (REPL): python3/python/node/irb/iex/ghci/julia. Returns a tool result with interactive=true metadata and a hint to use /shell instead of hanging or erroring. - completions: add /shell to builtin command list - help: document /shell [cmd]