WebSearch

A built-in definition supplied to the request when the tools option was omitted.

Captured description

Search the web. Returns result blocks with titles and URLs. US-only.

The current month is June 2026 — use this when searching for recent information.
allowed_domains / blocked_domains filter results.
After answering from results, end with a “Sources:” list of the URLs you used as markdown links.

Input schema

JSON

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "query": {
      "description": "The search query to use",
      "type": "string",
      "minLength": 2
    },
    "allowed_domains": {
      "description": "Only include search results from these domains",
      "type": "array",
      "items": {
        "type": "string"
      }
    },
    "blocked_domains": {
      "description": "Never include search results from these domains",
      "type": "array",
      "items": {
        "type": "string"
      }
    }
  },
  "required": [
    "query"
  ],
  "additionalProperties": false
}

Independent estimate

~292 tokens

The captured tool object was counted against the common baseline. This value supports comparison and is not additive.