Motivation: Color as a “Type System” for Pictures If you have ever looked at a black-and-white cellular automaton that felt like pure static, you are not alone. Many classical diagrams of elementary rules compress rich structure into just two colors. As programmers, we already accept that types expose structure in code that is invisible in raw bytes. In this article, I will argue that well-desig
The previous two posts covered how events flow from the SDK to the UI. This post focuses on visualizing one specific type of event: tool calls. Tool invocations are the most frequent operations in an Agent application. A typical task might call tools twenty or thirty times—reading files, writing files, executing commands, searching code. If every tool call renders as the same gray block, it's hard
Post 1 covered how AgentBridge converts the SDK's AsyncStream<SDKMessage> into [AgentEvent]. This post looks at what [AgentEvent] becomes — how TimelineView renders 18 event types, handles scroll behavior, and stays smooth when the event count gets large. TimelineView is the main body of the workspace, filling all the space between the sidebar and the input box. Its view hierarchy is shallow: Time