{
  "type": "object",
  "properties": {
    "sources": {
      "type": "array",
      "description": "one entry per fetched source — each summarized on its own (per-source synthesis). This is the compression step: raw page text must never be copied here, only what the source contributes.",
      "minItems": 1,
      "items": {
        "type": "object",
        "properties": {
          "url": { "type": "string", "description": "the fetched source URL (a citation handle)" },
          "title": { "type": "string" },
          "summary": {
            "type": "string",
            "description": "what this source contributes to the question, in your own words — not a copy of the page"
          },
          "relevance": {
            "type": "string",
            "description": "which sub-question(s) this source bears on, and how strongly"
          }
        },
        "required": ["url", "summary"],
        "additionalProperties": true
      }
    }
  },
  "required": ["sources"],
  "additionalProperties": true
}