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Compass Engineering Docs

DL-323

The SessionError trace frame rides the FrameSink never-drop PRIORITY lane (not the bounded drop-oldest trace queue), via an isSessionError classifier extending the frame-sink.ts priority predicate — matching the SessionInjection never-drop carve-out, so surfaced failure content is as durable-on-the-spine as the lifecycle transition it reports

Status: Active (Matt, 2026-09-02)

Record: ../../agent/compass-agent-error-abort-surfacing/design.md