How do you know if your coding agent's instructions are getting better?

A common way to improve a coding agent is to change its instructions. You add a rule to AGENTS.md. You write a skill for a recurring task. You tell the agent to check something before editing code. Then the next run looks better. But was the instruction responsible? That's a harder question than it first appears. The problem with judging one... Weiterlesen: How do you know if your coding agent's instructions are getting better?