All developers can now release apps and bots for Microsoft Teams. At Build 2017 today, Microsoft is announcing new set of updates coming to Teams.
In addition to this, Microsoft is also introducing two new capabilities for apps in preview: Compose extensions and third-party notifications in the activity feed. Compose extensions are essentially small flyouts that open when you click on an app under the compose editor in a conversation — from there, you can get information from the app or interact with whatever feature the developer decides to integrate into the flyout.
Microsoft is also bringing Actionable Messages into Microsoft Teams. Actionable Messages in Microsoft Teams and other Office 365 services essentially allows users to interact with a message. Microsoft is teaming up with Salesforce, Freshdesk, Wrike and other companies to bring Actionable Messages into Microsoft Teams as well as some other Office 365 apps. The company is also bringing Microsoft Teams APIs to Microsoft Graph as a preview which will allow developers to access information about a certain team or channel using the integration.