Structured Output (JSON Mode)

const agent = new Agent({
  name: 'Data Extractor',
  instructions: 'Extract structured data from text.',
  model: openai('gpt-4o'),
  modelConfig: {
    responseFormat: { type: 'json_object' }
  }
});

const agent = new Agent({
  name: 'Profile Extractor',
  instructions: 'Extract person profile from text.',
  model: openai('gpt-4o'),
  modelConfig: {
    responseFormat: {
      type: 'json_schema',
      json_schema: {
        type: 'object',
        properties: {
          name: { type: 'string' },
          age: { type: 'integer' },
          email: { type: 'string' },
        },
        required: ['name', 'age', 'email'],
        additionalProperties: false,
      }
    }
  }
});

const result = await agent.process({ message: 'John Smith, 34, john@example.com' });
const profile = JSON.parse(result.message);
// { name: 'John Smith', age: 34, email: 'john@example.com' }

const extractor = LLM.openai('gpt-4o', {
  responseFormat: { type: 'json_object' }
});

const result = await extractor.generate('List 3 colors with hex codes', {
  system: 'Respond with valid JSON only.'
});
const data = JSON.parse(result.text);

const agent = new Agent({
  name: 'Extractor',
  model: anthropic('claude-sonnet-4-6'),
  modelConfig: {
    responseFormat: {
      type: 'json_schema',
      json_schema: {
        type: 'object',
        properties: {
          name: { type: 'string' },
          age: { type: 'integer' },
        },
        required: ['name', 'age'],
        additionalProperties: false,
      }
    }
  }
});