> ## 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 Fetch

> Fetch and process web pages using Anthropic's server-side tool.

Anthropic's web fetch tool retrieves and processes content from specific URLs.
Unlike web search, this tool fetches a known URL directly.

## Enable Web Fetch

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

## Usage

```dart theme={null}
await for (final chunk in agent.sendStream(
  'Retrieve https://dart.dev and summarize the main features.',
)) {
  stdout.write(chunk.output);
}
```

## Fetched Documents

Fetched content is attached as `DataPart` instances on the message history:

```dart theme={null}
final history = <ChatMessage>[];
await for (final chunk in agent.sendStream(prompt)) {
  stdout.write(chunk.output);
  history.addAll(chunk.messages);
}

// Access fetched documents
for (final msg in history) {
  for (final part in msg.parts) {
    if (part is DataPart) {
      print('Fetched: ${part.name} (${part.mimeType})');
      File('output/${part.name}').writeAsBytesSync(part.bytes);
    }
  }
}
```

## Combined Tools

Combine web fetch with other tools for research workflows:

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

## Example

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

## Related Topics

* [Server-Side Tools](/server-side-tools)
* [Web Search](/server-side-tools/anthropic-web-search)