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| <html><head><meta charset="utf-8"><title>I Mass-Deployed an AI Coding Agent. Then the Model Updated and Nobody Told Me.</title></head><body><h1>I Mass-Deployed an AI Coding Agent. Then the Model Updated and Nobody Told Me.</h1> | |
| <p>Last month, I woke up to a Slack message from our most senior | |
| engineer: “Did something change? The agent is rewriting entire files | |
| again.”</p> | |
| <p>I checked the logs. Same prompts. Same codebase. Same agent config. | |
| But the model underneath had silently updated — and our carefully-tuned | |
| workflows broke in ways no benchmark would ever catch.</p> | |
| <p>Our CI failure rate doubled in three days. Nobody connected it to the | |
| model update because there was no announcement, no changelog, no version | |
| bump. Just… different behavior.</p> |