human-in-the-loop-setup.mdx

### Install the LangGraph Python SDK

<InstallPythonSDK />

### 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.

<DemoCode file="src/agents/frontend_tools.py" region="middleware" />

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.