Streaming

const a = agent({ model: anthropic('claude-sonnet-4-6'), system: '...' });

const { textStream, finalResult } = a.stream('Tell me a story.');
for await (const chunk of textStream) process.stdout.write(chunk);

const { usage } = await finalResult;

Inside a graph, use streamAsNode instead of asNode. The node emits token.delta events as chunks arrive:

graph<State>().node(
  'narrate',
  writer.streamAsNode<State>(
    (s) => s.prompt,
    (r) => ({ output: r.text }),
  ),
);

The trace UI shows streamed outputs as they arrive.