try {
  await agent.send('What is the meaning of life?');
} catch (e) {
  if (e.toString().contains('429')) {
    print('Whoa there, speedster! Rate limited. Time for coffee ☕');
  } else if (e.toString().contains('401')) {
    print('Nice try, but that API key is faker than a $3 bill');
  }
}

try {
  final agent = Agent('openai');
  await agent.send('Hello, HAL');
} catch (e) {
  if (e.toString().contains('OPENAI_API_KEY')) {
    print('I'm afraid I can't do that, Dave. Set your OPENAI_API_KEY first.');
  }
}

final flakeyTool = Tool(
  name: 'weather_api',
  description: 'Get weather (when it feels like working)',
  onCall: (args) async {
    // Murphy's Law strikes again
    throw Exception('Weather service is having a Monday');
  },
);

// The AI gracefully handles tool failures
final agent = Agent('openai', tools: [flakeyTool]);
await agent.send('What's the weather?'); 
// AI: "I tried to check the weather, but the service seems to be down..."

Future<ChatResult> sendWithRetry(
  Agent agent,
  String prompt, {
  int maxRetries = 3,
}) async {
  for (var i = 0; i < maxRetries; i++) {
    try {
      return await agent.send(prompt);
    } catch (e) {
      if (i == maxRetries - 1) rethrow;
      await Future.delayed(Duration(seconds: 1 << i));
    }
  }
  throw Exception('Max retries exceeded');
}

Future<ChatResult> sendWithFallback(String prompt) async {
  final providers = ['openai', 'anthropic', 'google'];
  
  for (final provider in providers) {
    try {
      final agent = Agent(provider);
      return await agent.send(prompt);
    } catch (e) {
      print('$provider failed: $e');
      if (provider == providers.last) rethrow;
    }
  }
  
  throw Exception('All providers failed');
}

// Automatic retry with exponential backoff
final agent = Agent('openai');
await agent.send('Hello'); // Retries on 429