Two built-in master agents are background processes operating on each Process Commander node. They are not defined by agents rules. (Technically, these are daemons, rather than full agents.)
The Master-for-Requestors master agent monitors idle requestor sessions to enforce automatic timeouts. By default, this occurs every 60 seconds. Your site can establish another value in the prconfig.xml file setting:
<env name="agents/requestortimeoutwakeup" value="NNN" />
The Master-for-Agents master agent starts and
 monitors agents defined through agents rules and agent schedule
 data instances. By default, the
 Master-for-Agents master agent awakes every ten minutes. Your
 site can establish another value in the
    prconfig.xml file setting:
<env name="agents/newqueuewakeup" value="NNN" />
where NNN is in seconds.
                
Through
    prconfig.xml settings, the second master agent can
 detect long-running requestors, and add a line to the Alert log
 when one is detected. See How to
 detect long-running requestors.
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                    agent, Alert log, daemon, prconfig.xml file, Queue Manager, timeout | 
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                    About Agent Schedule data instances |