The article outlines the process of creating a custom in-app activity feed similar to Notion's using the Knock JavaScript client in a Next.js application. It details steps for setting up the client, configuring the feed, fetching and rendering feed items, as well as managing message engagement statuses. The tutorial also provides insights into utilizing workflows and real-time updates for an interactive user experience.

This article explains how JavaScript directives, specifically "use workflow" and "use step," are integral to the Workflow DevKit's execution model, enabling workflows to suspend, resume, and maintain deterministic behavior. It highlights the importance of these directives in establishing semantic boundaries for code execution and ensuring consistent behavior across replays while allowing for durable and resilient workflows.