OpenAI File Search

final agent = Agent(
  'openai-responses',
  chatModelOptions: OpenAIResponsesChatModelOptions(
    serverSideTools: const {OpenAIServerSideTool.fileSearch},
    fileSearchConfig: const FileSearchConfig(
      maxResults: 5,
      vectorStoreIds: ['vs_123'],
    ),
  ),
);

await for (final chunk in agent.sendStream(prompt)) {
  final events = chunk.metadata['file_search'] as List?;
  if (events == null) continue;

  for (final event in events) {
    switch (event['type']) {
      case 'response.file_search_call.started':
        stdout.writeln('🔍 searching ${event['query']}');
      case 'response.file_search_call.result':
        stdout.writeln('- ${event['document']['filename']}');
    }
  }
}

final vectorStoreId = await setupVectorStore([
  '../../../wiki/Server-Side-Tools-Tech-Design.md',
  '../../../wiki/Message-Handling-Architecture.md',
]);