Assignment and Grade Services (AGS) is the LTI Advantage component that standardises how an external tool writes assessment results back into the LMS gradebook, replacing the older and more limited Basic Outcomes service from LTI 1.1. AGS separates two concerns: line items and results. A line item represents a gradebook column — it has a label, a maximum score, and a submission review URL. A result is a score posted to a specific line item for a specific learner. The tool can create multiple line items per LTI link (for example one for a quiz and one for completion), post results when the learner finishes, and optionally provide a URL where the instructor can review the learner's detailed submission. The LMS exposes AGS endpoints in the launch message, and the tool authenticates using the client credentials OAuth 2.0 flow specified by LTI 1.3. For video assessment products the practical design question is granularity: should you post a result immediately on each quiz attempt, or batch results at course completion? Posting incrementally gives the instructor a real-time view but can cause confusion in LMS gradebooks that display every intermediate result. AGS also supports a submission review link, which video platforms can use to deep-link the instructor back to the specific video timestamp where the learner's answer was recorded.
