The default reaction when an agentic pipeline misbehaves is to open the system prompt and start rewriting it. The instinct makes sense — the prompt is visible, editable, and feels like the thing you control. The problem is that the prompt is almost never where the bug is.
Source: [Dev.to](https://dev.to/hannune/instrument-first-then-prompt-finding-real-agentic-pipeline-bugs-if9)