CopilotKit

CopilotKit is an open-source frontend and runtime layer for bringing AI agents into real applications. It gives React and Angular apps hooks, chat/sidebar/popup UI, frontend tools, shared app-agent state, human-in-the-loop interactions, and an app-server runtime that talks to agent backends through AG-UI. The important distinction: CopilotKit is not primarily your backend planner. It is the layer that lets a Mastra, LangGraph, CrewAI, Pydantic AI, Microsoft Agent Framework, or custom AG-UI agent operate inside your product UI with state awareness and user approval. Use it when a dashboard, editor, research canvas, support console, or workflow app needs an agent that can see and act on the live interface instead of sitting in a disconnected chat box.