LLM 吐出了 JSON，程序就能放心接了吗

import json
import math

ALLOWED = {"技术", "汽车", "摄影", "待定"}

def unique_object(pairs):
    result = {}
    for key, value in pairs:
        if key in result:
            raise ValueError("重复字段: " + key)
        result[key] = value
    return result

def validate(raw):
    if len(raw) > 10000:
        raise ValueError("输出过长")
    item = json.loads(raw, object_pairs_hook=unique_object)
    if not isinstance(item, dict):
        raise ValueError("顶层必须是对象")
    if set(item) != {"category", "confidence", "needs_review"}:
        raise ValueError("字段不完整或存在多余字段")
    if not isinstance(item["category"], str):
        raise ValueError("分类必须是字符串")
    if item["category"] not in ALLOWED:
        raise ValueError("未知分类")
    score = item["confidence"]
    if type(score) not in (int, float):
        raise ValueError("置信度必须是数值")
    if not 0 <= score <= 1 or not math.isfinite(score):
        raise ValueError("置信度超出范围")
    if type(item["needs_review"]) is not bool:
        raise ValueError("复核标记必须是布尔值")
    if item["category"] == "待定" and not item["needs_review"]:
        raise ValueError("待定分类需要复核")
    return item

print(validate(
    '{"category":"摄影","confidence":0.8,"needs_review":false}'
))