switch (tool.id) {
  case 'openai.file_search': {
    const args = fileSearchArgsSchema.parse(tool.args);
    openaiTools.push({
      type: 'file_search',
      vector_store_ids: args.vectorStoreIds,
      max_results: args.maxResults,
      search_type: args.searchType,
    });
    break;
  }
  case 'openai.web_search_preview': {
    const args = webSearchPreviewArgsSchema.parse(tool.args);
    openaiTools.push({
      type: 'web_search_preview',
      search_context_size: args.searchContextSize,
      user_location: args.userLocation,
    });
    break;
  }
  default:
    toolWarnings.push({ type: 'unsupported-tool', tool });
    break;
}

 case 'provider-defined':
  switch (tool.id) {
    case 'openai.web_search_preview':
      openaiTools.push({
        type: 'web_search_preview',
        search_context_size: tool.args.searchContextSize as
          | 'low'
          | 'medium'
          | 'high',
        user_location: tool.args.userLocation as {
          type: 'approximate';
          city: string;
          region: string;
        },
      });
      break;
    default:
      toolWarnings.push({ type: 'unsupported-tool', tool });
      break;
  }