Is there a rubric for scoring CommonLit 360 short answer responses?
CommonLit provides this scoring guidance for short response questions in CommonLit 360 Reading Lessons and in CommonLit 360 Unit Skills Assessments. This guidance can also be found on the grading page of these assignments.

Short response questions in CommonLit 360 Reading Lessons and Unit Skills Assessments are tied to reading focus skills. The scoring guidance prioritizes how well students demonstrate the focus skill and comprehend the text. Because these responses are designed as quick, on-demand writing tasks completed in 10–15 minutes, they are not expected to be polished pieces of writing.
These short responses are formative. They are meant to inform instruction and help you identify trends across the class, not to serve as summative evaluations of student performance. You should use response patterns to decide whether to move on or plan a targeted follow-up, rather than treating each score as a final grade.
Each question on a CommonLit assignment is worth the same number of points — including multiple-choice and short-answer questions — for a total score of 100 points. For more information, see: How does the short answer grading scale work?