Ask the Masses: Grading for Embedded Classes and One-Shots

This week's AtM question relates to something I've been spending a lot of time doing lately: grading/assessment.

My question is:

At what level are you involved with grading and formally assessing student assignments/projects in the classes you work with? Do you provide feedback, but leave grading up to the course instructor? Do you grade library assignments? Do the course instructors count library assignments or activities for course credit? Let's have a conversation about assessment and grading!