New Tool Detects Silent Agent Regressions After Model Switches

A developer created a behavioral trajectory diff tool to detect silent agent regressions caused by model switches, where normal responses and text evals hide broken tool-calling behaviors.

2026-07-22 ~ 2026-07-22 · 2 related posts

Full story(2 episodes)→

• Episode 1: New Tool Detects Silent Agent Regressions After Model Switches(2026-07-22, 2 posts)
• Episode 2: whatbroke: Catching AI Agent Behavior Regressions(2026-07-25, 2 posts)

• Whatbroke diffs agent traces to catch silent regressions after a model swap — Impossible-Alarm-738 · 2026-07-22
• Model swap silently broke agent cancellations, so a developer built a behavior diff tool — Impossible-Alarm-738 · 2026-07-22