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Sweep 25 Sep 2026 · 19:33Z Build v2.1.283 504 read Stable v2.1.274 Latest v2.1.283 Next v2.1.283 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Tool description

WebSearch tool description

SDK-CLI Agent SDK, print mode, v2.1.282. The text the model is given for this tool, line by line, with each line marked against the previous capture taken the same way. 17 model strings share this prompt, byte for byte.

Lines271,322 characters
Moved+0−0 against v2.1.281
Sent to17model strings get this description
Copies2distinct descriptions under this name
Parameters31 of them required Every tool→every description on this arm
2 genuinely different descriptions of this tool
Haiku, Sonnet and Opus, 17 model strings Fable, Mythos and Opus, 10 model strings
Raw Reading
Plain text · sha256 74921e4371b5

The description, rendered

This renders the markdown inside the description, so it isn’t quite the description itself.

The raw view and the plain text are the bytes as they were sent.

  • 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:

  • After answering the user's question, you MUST include a "Sources:" section at the end of your response

  • In the Sources section, list all relevant URLs from the search results as markdown hyperlinks: Title

  • This is MANDATORY - never skip including sources in your response

  • 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 September 2026. 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

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" }
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