CopilotKit

CopilotKitSince 2024-03

CopilotKit is an open-source framework designed to help frontend developers build and embed contextual AI copilots and autonomous agents directly inside React and Next.js applications. Instead of building isolated chatbot sidebars that have no awareness of your application's state, CopilotKit connects the LLM directly to your frontend components, state stores, and backend APIs. With CopilotKit, applications gain two-way interaction with AI: users can ask questions in natural language, and the AI agent can read current component state, trigger actions across the UI (such as updating tables, filtering views, or submitting forms), and stream live generative UI widgets directly into the workspace. It natively supports popular LLMs, LangChain, and LangGraph multi-agent backends.

CopilotKit architecture consists of frontend React hooks and UI components (`useCopilotAction`, `useCopilotReadable`, `<CopilotSidebar />`) paired with an extensible runtime backend. The frontend hooks serialize active component state into dynamic LLM prompts and register client-side actions that can be triggered deterministically via function calling. The backend runtime acts as an orchestration proxy that can route execution to OpenAI, Anthropic, Ollama, or self-hosted LangGraph agent workflows. It handles streaming responses, structured schema validation, error recovery, and permission boundaries so that user-authorized actions cannot inadvertently alter unintended data. CopilotKit also provides built-in text-editing copilots and auto-suggest inputs for rich document manipulation.

CursorSince 2023-03

An AI-first code editor built on VS Code that understands your entire codebase for smarter completions and chat.

Supports GPT-4 and Claude models. Features codebase-aware chat, inline edits, and auto-debug.