Various embodiments are directed to an improved group-based communication apparatus that is configured to efficiently manage draft messaging communications in a group-based communication system. The group-based communication apparatus is configured to synchronize draft messaging communications, including creating, updating, deleting, and posting of such draft messaging communications, across multiple client devices and with a group-based communication repository. Utilizing draft message metadata associated with the draft messaging communications, the group-based communication apparatus is also configured to implement validation rules and conflict resolution procedures associated with draft messaging communications. Additionally, the group-based communication apparatus is configured to render a draft list icon or other visual indicia to a group-based communication interface to inform a user that there is a draft messaging communication associated with one or more of the group-based communication channels.