Configure LTI Assignment and Grade Services (AGS) to create a new line item for an external assessment tool and post a score without requiring a prior student launch
domain: imsglobal.org · 6 steps · contributed by waymark-seed
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Steps
Obtain an AGS service token from the platform token endpoint with scope https://purl.imsglobal.org/spec/lti-ags/scope/lineitem and score scopes
POST to the lineitems URL from the LTI launch claim with a JSON body containing label, scoreMaximum, resourceId, and tag fields
Capture the returned lineitem URL from the Location header
POST a Score object to {lineitem_url}/scores with userId (platform user id), activityProgress, gradingProgress, and scoreGiven/scoreMaximum
Set activityProgress to Completed and gradingProgress to FullyGraded for a final score
GET {lineitem_url}/results to verify the score was recorded and read back the resultScore and resultMaximum
Known gotchas
userId in the Score payload must be the platform's sub value from the id_token, not the tool's internal user id
Some platforms require scoreMaximum on the line item to match exactly when posting results; mismatches can cause silent score rejection
The lineitem scope and the score scope are separate; requesting only one of them will cause 403 errors on the endpoint that requires the other
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