**AI Agent Regression Testing After a Prompt or Model Change** > An agent'

**AI Agent Regression Testing After a Prompt or Model Change**

> An agent's behavior can change when you edit a prompt, swap a model, change a tool schema, or change what retrieval returns. This guide covers the locked case set, the per-case behavioral contract, and how to run the same suite against two concrete model slugs through OpenRouter so the diff shows what the change did.

**来源信息**
- **来源**：OpenRouter：Announcements（RSS）
- **分类**：ai-products
- **发布时间**：2026-09-30 08:00（北京时间）
- **原文**：[打开原文](https://openrouter.ai/blog/tutorials/ai-agent-regression-testing-after-a-prompt-or-model-change)