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CopilotKit is a best-in-class SDK for building full-stack agentic applications, Generative UI, and chat applications.

We are the company behind the AG-UI Protocol, adopted by Google, LangChain, AWS, Microsoft, Mastra, PydanticAI, and more!

Features:

• Chat UI – A React-based chat interface that supports message streaming, tool calls, and agent responses.
• Backend Tool Rendering – Enables agents to call backend tools that return UI components rendered directly in the client.
• Generative UI – Allows agents to generate and update UI components dynamically at runtime based on user intent and agent state.
• Shared State – A synchronized state layer that both agents and UI components can read from and write to in real time.
• Human-in-the-Loop – Lets agents pause execution to request user input, confirmation, or edits before continuing.

npx copilotkit@latest create -f <framework>

npx copilotkit@latest init

What this gives you:

• CopilotKit installed – Core packages are fully set up in your app
• Provider configured – Context, state, and hooks ready to use
• Agent <> UI connected – Agents can stream actions and render UI immediately
• Deployment-ready – Your app is ready to deploy

Complete getting started guide →

CopilotKit connects your UI, agents, and tools into a single interaction loop.

This enables:

• Agents that ask users for input
• Tools that render UI
• Stateful workflows across steps and sessions

The useAgent hook is a proper superset of useCoAgent and sits directly on AG-UI, giving more control over the agent connection.

// Programmatically access and control your agents
const { agent } = useAgent({ agentId: "my_agent" });

// Render and update your agent's state
return <div>
  <h1>{agent.state.city}</h1>
  <button onClick={() => agent.setState({ city: "NYC" })}>
    Set City
  </button>
</div>

Check out the useAgent docs to learn more.

Generative UI is a core CopilotKit pattern that allows agents to dynamically render UI as part of their workflow.

• Static (AG-UI Protocol)
• Declarative (A2UI)
• Open-Ended (MCP Apps & Open JSON)

Generative UI educational repo →

Connect agent workflow to user-facing apps, with deep partnerships and 1st-party integrations across the agentic stack—including LangGraph, CrewAI, and more.

npx create-ag-ui-app my-agent-app

• What's New

Thanks for your interest in contributing to CopilotKit! 💜

We value all contributions, whether it's through code, documentation, creating demo apps, or just spreading the word.

Here are a few useful resources to help you get started:

• For code contributions, CONTRIBUTING.md.

• For documentation-related contributions, check out the documentation contributions guide.

• Want to contribute but not sure how? Join our Discord and we'll help you out!

This repository's source code is available under the MIT License.