# Message composer

Messages can contain up to 120,000 characters. If a draft is longer, T3 Code keeps it in the
composer and shows how many characters need to be removed. Shorten the draft or split it into
multiple messages, then send again in the same thread.

On desktop, press `Cmd+Enter` on macOS or `Ctrl+Enter` on Windows and Linux from a new thread to
start it in the background. T3 Code opens another new thread and shows an **Open** action for the
thread that started. The new thread keeps the selected workspace mode and base branch. If **New
worktree** is selected, each background thread creates its own worktree.