You can use this parameter to determine the initial number of idle agents that are created in the agent pool when the db2start command is issued.
The database manager always starts the num_initagents idle agents as part of the db2start command, except if the value of this parameter is greater than num_poolagents during start up and num_poolagents is not set to AUTOMATIC. In this case, the database manager only starts the num_poolagents idle agents since there is no reason to start more idle agents than can be pooled.