Agent Context Setup - Copilotkit

<Steps> <Step> ### Install the ADK + AG-UI bridge

```bash
pip install ag-ui-adk
```

</Step> <Step> ### Read CopilotKit context before each model call

`useAgentContext` entries arrive in ADK session state under
`state["copilotkit"]["context"]`. Add `AGUIToolset()` to the agent and
use a `before_model_callback` to inject those read-only values into the
system instruction.

<DemoCode file="src/agents/readonly_state_agent_context_agent.py" region="agent-context-setup" />

</Step> </Steps>