That's Sum Puzzle

Standard sudoku rules apply: each row, column, and 3x3 box must contain all the digits from 1 to 9.

Clues outside the grid are omni-directional X-sums. In all vertical, horizontal, and diagonal directions which are available, the clue is an X-sum clue. The sum of the first X digits along a direction must sum to the value of the clue; X is the first digit in that direction from the clue.

Digits in cages must sum to the number in the top left corner of the cage.