> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mutagent.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Monitor

> The agent watches a long-running command in the background and reacts as output arrives, line by line.

`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.

```
watch the dev server logs and fix the first exception that appears
```

```
● Monitor(tick loop)
  ⎿  Monitor started — id mon-1 · "tick loop"
```

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.