Harness Engineering Exposes the Brittleness of AI Safety, Evaluation, and Agents

AI Sentinel: Frontier Daily · Oct 10, 2026 · 21m · transcript

- Optimizing agent harnesses—tool routing, context curation, and failure attribution—can deliver capability gains, with the right lever depending on failure composition, while introducing new failure modes at the seams between model and scaffold. ⏱️ Chapters 00:00 Intro 00:16 Harness Engineering Exposes the Brittleness of AI Safety, Evaluation, and Agents 00:21 Highlights 02:28 The Harness Frontier: Runtime Scaffolding Outpaces Weight Training for Agent Improvement 05:38 Deterministic Safety Gates: Moving from Probabilistic Refusal to Compiled Policy Enforcement 08:30 The Evaluation Crisis…