Ant Design X is a monorepo housing a comprehensive React component library for building AI-powered conversational interfaces. The core package `@ant-design/x` provides atomic UI components such as Bubble, Sender, Conversations, ThoughtChain, Attachments, and Prompts, all designed around the RICH design paradigm (Role, Intention, Conversation, Hybrid UI). These components are built with streaming support, rich theming via CSS-in-JS, and deep integration with Ant Design's token system. The library includes a full documentation site with interactive demos, live code editing, and performance benchmarks. Complementing the UI library are several companion packages: `@ant-design/x-markdown` offers a streaming-friendly Markdown renderer with custom plugins (LaTeX, component mapping), tail content insertion, and a built-in debug panel. `@ant-design/x-sdk` provides a lightweight SDK for AI model integration, including `XRequest` (a fetch wrapper with SSE/NDJSON streaming, timeouts, and middlewares), `XStream` (a TransformStream-based SSE parser), and React hooks (`useXChat`, `useXConversations`) for managing chat state and conversation history. `@ant-design/x-card` implements an experimental A2UI protocol (v0.8/v0.9) for dynamically rendering agent-driven UI from structured commands, and `@ant-design/x-skill` is a CLI tool for installing AI skill templates into IDEs like Claude and Cursor. The repository is primarily an application-level library, though it contains some research-adjacent elements such as benchmarking scripts for streaming renderers and the A2UI protocol design. The overall architecture is a well-structured monorepo with clear package boundaries, extensive test coverage (unit, snapshot, visual regression, performance), and a strong emphasis on streaming and real-time interaction patterns. It demonstrates high craftsmanship with reusable hooks, composable providers, and a consistent styling system.