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Upgrade Regression

🟡 MEDIUM structural proven AVE-2025-0016

· aka: Model Update Drift, Silent Capability Loss

Summary

Model upgrades introduce silent behavioural regressions. Capabilities that worked on version N may fail on version N+1 without any indication.

Blast Radius

Silent production failures after routine model upgrades.

Prerequisites

Model version change in production.

Environment

  • Frameworks: LangGraph
  • Models tested: [Available in NAIL SDK]
  • Multi-agent: No
  • Tools required: No
  • Memory required: No

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