DeepAgent extends ReactAgent with additional subagent type information.
This type wraps ReactAgent but includes the DeepAgentTypeConfig which contains subagent types for type-safe streaming and delegation.
DeepAgent: ReactAgent<TTypes> __typeconst agent: DeepAgent<DeepAgentTypeConfig<...>> = createDeepAgent({ ... });
// Access subagent types for streaming
type Subagents = InferDeepAgentSubagents<typeof agent>;