The Day the Knowledge Cutoff Moved Forward, the Stale Part Was My System Instruction
When a model's knowledge cutoff advances, the thing that goes stale is not the model — it is the dated assertions in your system instruction. Here is why only the lines written between the two cutoffs flip from helpful to contradictory, plus a working audit script and its measured results.
What language should your system instruction be in? Measuring three approaches when most prompts arrive in the user's language
Keep the system instruction in English, or translate it into the user's language? I measured input tokens per language with countTokens, then lined up output-language match and schema compliance to find where nine tokens is enough.
Gemini 3.x Prompt Engineering Complete Masterclass — System Instructions, Few-shot, CoT, ReAct & Self-Evaluation Loops with Working Code
A deep-dive masterclass on prompt engineering optimized for Gemini 3.x models. Learn System Instructions design, Few-shot selection strategies, CoT + Thinking Budget integration, ReAct patterns, and Critic-Refiner loops — all with production-ready Python code and before/after comparisons.