2 genuinely different descriptions of this tool
Plain text · sha256 da2fa36a5eab
The description, line by line
5 lines Line numbers are v2.1.278 on the left and this capture on the right.
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Search the web. Returns result blocks with titles and URLs. US-only.
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- Allows Claude to search the web and use the results to inform responses
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- Provides up-to-date information for current events and recent data
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- Returns search result information formatted as search result blocks, including links as markdown hyperlinks
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- Use this tool for accessing information beyond Claude's knowledge cutoff
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- Searches are performed automatically within a single API call
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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](URL)
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- This is MANDATORY - never skip including sources in your response
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- Example format:
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[Your answer here]
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Sources:
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- [Source Title 1](https://example.com/1)
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- [Source Title 2](https://example.com/2)
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Usage notes:
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- Domain filtering is supported to include or block specific websites
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- Web search is only available in the US
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IMPORTANT - Use the correct year in search queries:
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- The current month is September 2026. You MUST use this year when searching for recent information, documentation, or current events.
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- Example: If the user asks for "latest React docs", search for "React documentation" with the current year, NOT last year
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- The current month is September 2026 — use this when searching for recent information.
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- `allowed_domains` / `blocked_domains` filter results.
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- After answering from results, end with a "Sources:" list of the URLs you used as markdown links.
What it accepts
3 parameters The JSON parameter schema sent beside this description, 577 characters of it. Name, type, then whether the client marked it required.allowed_domains
string[]
optional
Only include search results from these domains
blocked_domains
string[]
optional
Never include search results from these domains
query
string
required
The search query to use
sha256 78ab127603dd · the schema as the client sent it:
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"additionalProperties": false,
"properties": {
"allowed_domains": {
"description": "Only include search results from these domains",
"items": {
"type": "string"
},
"type": "array"
},
"blocked_domains": {
"description": "Never include search results from these domains",
"items": {
"type": "string"
},
"type": "array"
},
"query": {
"description": "The search query to use",
"minLength": 2,
"type": "string"
}
},
"required": [
"query"
],
"type": "object"
}