Usage Tracking

final agent = Agent('openai');
final result = await agent.send('Explain AI briefly');

// Access usage
print('Input tokens: ${result.usage.promptTokens}');
print('Output tokens: ${result.usage.responseTokens}');
print('Total tokens: ${result.usage.totalTokens}');

final agent = Agent('openai');
final result = await agent.embedDocuments([
  'Text 1',
  'Text 2',
  'Text 3',
]);

print('Tokens used: ${result.usage.totalTokens}');