DENSE distills agent traces into reusable feedback with no outcome labels.

This method compresses redundant attempts into nested shortcut trees, reconciles issues across levels using recovery evidence, and summarizes completed branches while expanding unresolved ones, with no post-hoc outcome labels or expert annotation. Under a source-paired protocol that resets environments and contexts for fresh attempts, it gets the highest strict pass rate among non-privileged feedback methods across four recipient models on Terminal-Bench 2.1, improving 7.12 to 15.64 percentage points while the reruns consume 19.0% to 43.6% fewer tokens.