How to test model switches for AI agents before shipping to catch silent tool-calling regressions
Fun_Employment6042 · reddit · 2026-10-02
A developer running an AI agent app (tool calling, multi-step) asks how to test model migrations without silent regressions: the new model's output looks fine but drops tool calls, passes slightly different arguments, or picks a different tool.
- Key concerns: lost tool calls, argument drift, changed tool selection — invisible if you only check text output
- Questions: real tools vs homegrown scripts vs ship-and-watch? Did any tooling actually catch issues?
- Specifically about agent/tool-calling setups, not plain chat
Related event: Dev asks how to catch silent regressions before swapping agent models(2 posts)→
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