Prompt Engineering for AI Agents — What Actually Works in Production (2026)

Most AI agents give inconsistent answers because of a small set of repeatable prompt mistakes. This video shows exactly what they are and how to fix them — using real before/after diffs from production agents. Why prohibitions without a positive instruction backfire with modern models The minimal prompt: four elements and nothing else The both-sides rule: why one-sided instructions always fail Defensive patches: how they accumulate and how to audit them The four most common failure patterns with exact fixes