State Streaming Setup - Copilotkit

<Steps> <Step> ### Install the LangGraph Python SDK

<InstallPythonSDK />

</Step> <Step> ### Add state streaming middleware

`StateStreamingMiddleware` maps a tool argument to an agent state key and
forwards partial tool-call arguments as state updates while the model is
still generating.

<DemoCode file="src/agents/shared_state_streaming.py" region="state-streaming-middleware" />

</Step> </Steps>