By default, Reclaim's Slack integration will send or update messages anytime:
A Habit is about to start
A Task is about to start
Travel Time has been blocked out for an event
You are invited to a new synced event
A synced event you're invited to has a time change
A synced event you're invited to is deleted or canceled
Here are what your notification preferences look like by default:

Modifying notification preferences
You can manage your notification preferences by
Type
/reclaim settings
from the Messages page of Reclaim within Slack, orClick the Settings button from the Home page of the Reclaim app in Slack.