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Monitor is a tool, not a command: the model reaches for it when you ask it to watch something — a dev server, a build, a log file, a flaky test loop. The command runs in the background and each output line arrives as a notification while the model keeps working, so “start the server and tell me when it errors” is one instruction, not a babysitting job.
A watch ends when the process exits, on timeout, when the agent cancels it, or when the output floods. Monitor renders in the transcript like any built-in tool, and sub-agents have it too — the crew’s watcher agents are built on it.