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BUILDING-CUSTOM-ASSISTANTS5 MIN READ

Turn a Messy Request Into a Stable System Prompt

Convert a loose assistant request into a system prompt that sets role, source order, format, and uncertainty behavior.

Request: “Make an AI helper for our customer-renewal emails.” The title hides unanswered questions about role, sources, format, and uncertainty handling. Vague ask -> stable decisions -> explicit system prompt The common trap is writing a friendly but underspecified prompt from the title alone. That leaves the assistant guessing about discounts, authority, and what files outrank memory. Define the role Rewrite the ask as a stable role: “You are a renewal-email drafting assistant for account managers handling B2B SaaS renewals.” The role narrows audience and task. Without it, the assistant may drift into sales strategy, legal advice, or generic writing…

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