CopilotKit (MIT): Open-source building blocks for agent apps and generative UI

CopilotKit (MIT) - Open-Source Building Blocks for Agent Apps and Generative UI

CopilotKit offers MIT-licensed React components and claims 30k GitHub stars. It covers chat, streaming, tool calls, HITL, and generative UI, with AG-UI support for LangGraph, CrewAI, LlamaIndex, and other backends. The key point is decoupling the UI layer from agent frameworks.

Why it matters: HKR-H/K/R all pass: MIT open source, 30k stars, and AG-UI links to major agent backends. Kept in 72–77 because the post lacks a new version, benchmark, or named production adopter.