[
 {
  "type": "function",
  "function": {
   "name": "request_evidence",
   "description": "Return the exact text of previously unread evidence items by ID. Choose IDs from the case index; the result arrives as a tool message.",
   "parameters": {
    "type": "object",
    "properties": {
     "evidence_ids": {
      "type": "array",
      "minItems": 1,
      "maxItems": 12,
      "uniqueItems": true,
      "items": {
       "type": "string",
       "pattern": "^E[1-9][0-9]*\\.[1-9][0-9]*$"
      }
     },
     "reason": {
      "type": "string",
      "minLength": 10,
      "description": "A concise statement of what this fetch will help decide."
     }
    },
    "required": [
     "evidence_ids",
     "reason"
    ],
    "additionalProperties": false
   }
  }
 }
]