Anthropic Web Search

final agent = Agent(
  'anthropic',
  chatModelOptions: const AnthropicChatOptions(
    serverSideTools: {AnthropicServerSideTool.webSearch},
  ),
);

await for (final chunk in agent.sendStream(
  'Search the web for the three most recent announcements '
  'about the Dart programming language and summarize them.',
)) {
  stdout.write(chunk.output);
}

await for (final chunk in agent.sendStream(prompt)) {
  stdout.write(chunk.output);

  final events = chunk.metadata['web_search'] as List?;
  if (events != null) {
    for (final event in events) {
      stdout.writeln('[search] ${event['type']}');
    }
  }
}