PRODUCTION SCENARIO
A support assistant's prompt, written for an older model, says "CRITICAL: You MUST use the lookup tool whenever in doubt." After the team moves the assistant to Claude Opus 4.6, it calls the tool on nearly every greeting.
What prompt change should the team make?
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Show answer and explanation
Answer: Soften the wording to "Use this tool when..." and drop the when-in-doubt rule
Claude Opus 4.5 and Claude Opus 4.6 are more responsive to the system prompt, so wording written to fix undertriggering now overtriggers. The documented fix is to dial back aggressive language, and the guide names when-in-doubt instructions as a direct cause of overtriggering.