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By default, a model’s reply is delivered as a single complete message at the end of each turn. With streaming output enabled, the SDK pushes fine-grained incremental chunks as the model generates them — useful for typewriter effects, or for rendering reasoning and tool-invocation progress separately.

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Enable

Set includePartialMessages: true in options: 
import { qodercliAuth, query } from '@qoder-ai/qoder-agent-sdk';

const q = query({
  prompt: 'Write a short analysis report',
  options: {
    auth: qodercliAuth(),
    includePartialMessages: true,
  },
});

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Typewriter effect

The model’s text reply arrives as a sequence of incremental chunks; printing each chunk as it lands gives a typewriter effect: 
for await (const msg of q) {
  if (msg.type === 'stream_event') {
    const delta = msg.event.delta;
    if (delta?.type === 'text_delta') {
      process.stdout.write(delta.text);
    }
  }
}

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Reasoning

Reasoning-capable models emit “thinking” chunks before their final reply: 
if (delta?.type === 'thinking_delta') {
  process.stdout.write(delta.thinking);
}

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Tool invocation arguments

Tool-call arguments are also generated incrementally — for example, you can use this to render the file content the model is writing in real time: 
if (delta?.type === 'input_json_delta') {
  process.stdout.write(delta.partial_json);
}
For the full event structure, see SDK References.