CopilotKit

From the README

• Chat UI – A fully customizable 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.
• Self-Learning (early access) – Agents that continuously improve from user feedback via in-context reinforcement learning (CLHF).

Excerpts from the project README on GitHub. Copyright and licensing remain with the respective authors.