{
  "name": "Query",
  "description": "query function",
  "parameters": {
    "type": "object",
    "properties": {
      "query": {
        "type": "string",
        "description": "query, required"
      },
      "k": {
        "type": "integer",
        "description": "top k, optional, default value is 3"
      },
      "thresold": {
        "type": "number",
        "description": "thresold, optional, default value is 0.5"
      }
    },
    "required": [
      "query"
    ]
  }
}