### Install the LangGraph Python SDK ### Wire CopilotKit middleware into your graph For `useHumanInTheLoop` tool-based HITL, the tool is defined entirely on the frontend and forwarded to the agent. `CopilotKitMiddleware` is what forwards it — drop it into your `create_agent` call. For the `useInterrupt` graph-paused pattern, you'll also use LangGraph's native `interrupt(...)` primitive inside a graph node — no extra CopilotKit setup beyond the middleware above.