Which OmniStudio tool creates a Chatter post and sends to a Chatter feed?

The OmniStudio tool that creates a Chatter post and sends it to a Chatter feed is Integration Procedure. An Integration Procedure can execute multiple DataRaptor actions, such as Extract, Transform, and Load, and also invoke REST or SOAP services. One of the REST services that an Integration Procedure can invoke is Chatter API, which allows creating and sending Chatter posts to users or groups