I built a toy news-summarizing agent with Gemma 4, and it was so frustrating, actually, because of the cut-off date.

The model wasted over half the token budget, each time, on internal debates over the current date.

When generating a World Cup summary, for example, it refused to believe qualification rounds were over and refused to even call the web searching tool to collect the data.

I injected the current datetime at the very beginning of the system prompt, but Gemma refused to believe it!

The m-effer insisted the timestamp was fake and hypothesized it was being evaluated in a synthetic lab test with simulated future dates!

No amount of system prompting could convince it to trust the clock.

That was the most frustrating and bizarre "bug" I ever faced!