> ## Documentation Index
> Fetch the complete documentation index at: https://docs.dartantic.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Anthropic Web Search

> Search the web using Anthropic's server-side search tool.

Anthropic's web search tool allows Claude to search the web and incorporate
real-time information into responses.

## Enable Web Search

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

## Usage

```dart theme={null}
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);
}
```

The model automatically decides when to search based on the query. Search
results are incorporated directly into the response with citations.

## Streaming Metadata

Web search events stream through `metadata['web_search']`:

```dart theme={null}
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']}');
    }
  }
}
```

## Example

* [Anthropic Web Search
  demo](https://github.com/csells/dartantic_ai/blob/main/packages/dartantic_ai/example/bin/server_side_tools_anthropic/server_side_web_search.dart)

## Related Topics

* [Server-Side Tools](/server-side-tools)
* [Web Fetch](/server-side-tools/anthropic-web-fetch)
* [Code Interpreter](/server-side-tools/anthropic-code-interpreter)