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Write custom instructions that actually change the output

Most people put a bio in their custom instructions. Better: tell the assistant how you want answers shaped. That includes length, format and what to skip.

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Issue
Level
Beginner
Time to apply
5 min

Custom instructions (or a project or system prompt) apply to every chat. "I'm a marketing manager" helps a little. Rules about the shape of answers help a lot more.

Instructions worth adding

  • "Lead with the answer. Put explanation after."
  • "Skip disclaimers and generic advice unless I ask."
  • "When there's a tradeoff, give me your recommendation, not just the options."
  • "Use tables when comparing three or more things."
  • "If my request is ambiguous, ask one clarifying question first."

Test them

Ask the same question with and without your instructions. If you can't see a difference, rewrite the rule more concretely.

Copy-ready prompt

Starter custom instructions
Lead with the answer, then the reasoning. Be concise; skip disclaimers and generic advice unless I ask. When there's a tradeoff, recommend one option and say why. Use tables to compare 3+ items. If my request is ambiguous, ask one clarifying question before answering.
Open inChatGPTClaude

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