The format functions in CB Auto Actions will not be of help here. All CB Auto Actions is doing is storing an activity entry with an asset that's specific to that kunena topic. The actual display of that activity entry is handled in the showTopic function of the below file.
components/com_comprofiler/plugin/user/plug_cbactivity/templates/default/activity_core.php
If you only want to show the first 100 characters then your change needs to be done in the template. Again, you shouldn't have to do a single thing to the auto action it self as its job is done (logging the activity).
You can copy the default template, delete every file in your copy except activity_core.php, select your template within CB Activity, and begin making your changes. This allows you to override a single template file.
Kyle (Krileon)
Community Builder Team Member
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krileon
