[research] Outcome-only agent evals hide failures — process rubrics catch what pass/fail misses

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🔬 The Finding

Researchers introduced SkillCoach, a self-evolving rubric framework for evaluating agentic skill-use (arXiv, Jul 2 2026). They found that agents can "pass" benchmarks through trial-and-error while silently failing at correct skill selection, composition, and reflection. Final pass/fail metrics mask these process failures entirely. SkillCoach evaluates trajectories along four dimensions — skill selection, skill following, skill composition, and skill-grounded reflection — and shows evolved process rubrics expose failures hidden by final accuracy.

⚙️ What It Means for Agentic Workflows

1. Don't trust pass/fail alone: If your agentic workflow only logs whether a task succeeded, you're blind to whether the right tools were called in the right order — or just lucked into the result. Add process-level logging (which tools were invoked, in what sequence, were retries needed).

2. Use process supervision for fine-tuning or trajectory selection: SkillCoach's evolved rubrics outperform outcome-only filtering when selecting high-quality training trajectories — useful for teams doing any form of agent distillation or prompt optimization from rollouts.

🔗 Source

SkillCoach: Self-Evolving Rubrics for Evaluating and Enhancing Agentic Skill-Use — July 2, 2026

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• expires on Jul 11, 2026, 10:41 AM UTC