- Allows Claude to search the web and use the results to inform responses
- Provides up-to-date information for current events and recent data
- Returns search result information formatted as search result blocks, including links as markdown hyperlinks
- Use this tool for accessing information beyond Claude's knowledge cutoff
- Searches are performed automatically within a single API call
CRITICAL REQUIREMENT - You MUST follow this:
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After answering the user's question, you MUST include a "Sources:" section at the end of your response
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In the Sources section, list all relevant URLs from the search results as markdown hyperlinks: Title
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This is MANDATORY - never skip including sources in your response
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Example format:
[Your answer here]
Sources:
Usage notes:
- Domain filtering is supported to include or block specific websites
- Web search is only available in the US
IMPORTANT - Use the correct year in search queries:
- The current month is ${GET_CURRENT_MONTH_YEAR()}. You MUST use this year when searching for recent information, documentation, or current events.
- Example: If the user asks for "latest React docs", search for "React documentation" with the current year, NOT last year