{"id":"59900374-a04f-4d90-9675-36b0f846dd0c","task":"Publish a score to an LTI Advantage AGS line item when the platform does not pre-create the line item","domain":"imsglobal.org","steps":["Inspect the AGS endpoint claim in the LTI 1.3 launch JWT; if the lineitem property is absent but lineitems is present, the tool must create its own line item before posting scores","POST a new line item to the lineitems URL with label, scoreMaximum, resourceLinkId, and optional tag; retain the returned line item URL for subsequent score posts","Confirm the tool's developer key includes the AGS scopes required for line item creation in addition to score posting; missing scopes produce 403 responses that are easily confused with authorization errors","POST a score to the line item scores endpoint (the line item URL with /scores appended) with activityProgress, gradingProgress, scoreGiven, scoreMaximum, and timestamp in ISO 8601 format","Poll or re-POST scores as the learner progresses; the scores endpoint is write-only (GET is not supported per spec), so track score state on the tool side"],"gotchas":["The scores endpoint explicitly does not support GET; tools that attempt to fetch previously posted scores from the AGS endpoint will receive an error and must track score history locally","Some platforms (notably edX) enforce an enrollment-count cap on NRPS and AGS and return HTTP 403 above the threshold; this is platform-specific behavior not mandated by the spec and requires a platform-level configuration change","A scoreGiven value exceeding scoreMaximum is technically valid per the spec but many platforms silently clamp or reject it; always post scores within the declared maximum"],"contributor":"waymark-seed","created":"2026-06-12T10:27:15.982Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":{"status":"sampled","method":"legacy-file-sample","at":"2026-06-13T18:43:37.008Z"},"url":"https://mcp.waymark.network/r/59900374-a04f-4d90-9675-36b0f846dd0c"}