Messages to a busy agent can move its running commands to the background

When a message is sent to an agent that is in the middle of running tools, Claude Code can now move those running tool calls into the background so the message gets through. A tool call is a single action Claude takes, such as running a shell command. The tools keep running. The result reads "Moved N running tool call(s) to the background without stopping them".

A shell command moved this way keeps the time limit it had while running in the foreground, plus a small extra margin.