Rubric rules
A rubric is graded row by row. A grader reads one answer and marks every criterion true or false. These rules make sure every grader gives the same marks, that a correct answer passes and that a wrong answer is caught. Reviewers check every rule on every task. Aim for a rubric with no issues. Reviewers fix small issues themselves and approve; anything bigger comes back to you with comments.
The one-line version
Every row checks one thing, says it in concrete words, belongs to no other row, agrees with every other row, and comes from what the user actually asked.