The tools before analysis is a section of the analysis process that will run optional configured tools before any analysis takes place.
There are no specific logs for this process by itself, though the optional configured tools will have logs that can be reviewed.
This is all configured in CAST-MS in the 'Content Enrichment' tab. More information on this can be seen in the documentation here: CMS - Content Enrichment tab
Select the Logs that you are interested in
CAST-MS log file
The section of CAST-MS log file showing the start of the tools before analysis step and ending the tools before analysis task is shown below.
Starting Tools Before Analysis
INF: 2016-08-08 15:40:19: starting Task Tools before analysis
End Tools Before Analysis
INF: 2016-08-08 15:40:19: Task message: No Task message
INF: 2016-08-08 15:40:19: No associated log file
INF: 2016-08-08 15:40:19: ending Task Tools before analysis