CopilotKit is an open-source framework for building agent-native applications, AI chat interfaces, and generative user experiences. It provides frontend and backend primitives that let application developers connect agents to interfaces where users can chat, invoke tools, share application state, and collaborate with AI through interactive UI components.

Its core capabilities include customizable chat, backend tool rendering, generative UI, synchronized state between agents and applications, and human-in-the-loop workflows where execution can pause for approval or editing. CopilotKit supports multiple frontend environments including React, Next.js, Angular, Vue, and React Native, and is built around the AG-UI protocol for connecting agent backends to user interfaces.

The framework is aimed at developers who already have or are building agent logic and need a production-oriented interaction layer around it. Instead of forcing teams into one agent framework or model provider, CopilotKit focuses on the application surface, making the same agent capabilities usable across web, mobile, and emerging collaboration-channel integrations.