{
  "task_id": "easy-2",
  "description": "Fix the sum function with off-by-one error",
  "buggy_code": "def sum_list(nums):\n    total = 0\n    for i in range(len(nums) - 1):\n        total += nums[i]\n    return total\n",
  "correct_code": "def sum_list(nums):\n    total = 0\n    for i in range(len(nums)):\n        total += nums[i]\n    return total\n",
  "tests": [
    {"input": [[1, 2, 3]], "expected": 6},
    {"input": [[10, 20, 30]], "expected": 60},
    {"input": [[0, 0, 0]], "expected": 0},
    {"input": [[5]], "expected": 5}
  ]
}