Web Page External Link Extractor

{
  "type": "object",
  "required": [
    "url",
    "filter"
  ],
  "properties": {
    "url": {
      "type": "string",
      "minLength": 1,
      "description": "The full address of the web page to read, starting with https:// or http://."
    },
    "filter": {
      "enum": [
        "external"
      ],
      "type": "string",
      "description": "Which links to return. Only external links are offered."
    }
  },
  "additionalProperties": false
}

{
  "type": "object",
  "properties": {
    "links": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "url": {
            "type": "string",
            "description": "The link's address as written in the page; HTML entities such as & are not decoded."
          },
          "anchor_text": {
            "type": [
              "string",
              "null"
            ],
            "description": "The link's visible text, or null when it has none."
          },
          "rel_attributes": {
            "type": "array",
            "items": {
              "type": "string"
            },
            "description": "The link's rel values, such as nofollow or noopener; empty when none."
          }
        }
      },
      "description": "One entry per external link, in page order."
    },
    "source_url": {
      "type": "string",
      "description": "The page address that was fetched."
    },
    "total_links": {
      "type": "number",
      "description": "How many external links were found."
    }
  },
  "description": "The page's external links, as returned after shaping."
}