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Web Search (Claude)

The Web Search (Claude) tool (anthropic_web_search) is a native search feature from Anthropic that is directly integrated into Claude models. This tool provides real-time web results with source references.

How It Works​

Like the OpenAI variant, this native tool is built directly into Anthropic's Claude models. The model determines itself when a search query is needed and seamlessly integrates the results into the answer.

Advantages Over Universal Tools​

Native Web SearchUniversal Internet Search
Directly integrated in ClaudeExternal API call
Better context integrationResults processed separately
Optimized for ClaudeWorks with all models
Sources with contextBasic source citation

Settings​

SettingValue
Tool keyanthropic_web_search
Default statusAuto (for Claude models)
Available forClaude 4.0 and newer

Automatic Activation​

When you select a Claude model (such as Claude 4.0), this native tool is automatically activated and replaces the universal internet_search tool. This results in:

  • Seamless integration with Claude's reasoning process
  • Context-aware search queries
  • Higher quality answers

Source Citation​

Claude's web search tool delivers results with clear source citations. The model indicates which information comes from which source, so you can assess reliability.

Usage Examples​

The tool is automatically used when current information is needed:

  • "What are the recent developments in AI legislation?"
  • "How is the Euro doing today?"
  • "What happened at [recent event]?"

Both native tools offer similar functionality but are optimized for their respective models. The choice depends on which model you use - the correct native tool is automatically selected.

Limitations​

  • Only available with Anthropic Claude models
  • Requires the organization to have Claude models enabled
  • Search results may vary by region