Include two to five example exchanges in your system prompt that show exactly how you want the agent to sound — a student question followed by the ideal response in your voice — and the model will use those examples as a style template for every answer it gives.
Why Examples Work Better Than Descriptions
You can spend three paragraphs describing your voice: “Warm but direct. Encouraging but no fluff. Casual like a mentor, not formal like a professor.” That’s helpful, but the model is still guessing at what those words mean in practice. Show it an example and the guesswork disappears. This is the same reason teachers use worked examples in the classroom — reading a correct solution teaches students more than reading a list of rules about how to solve problems.
With two or three well-chosen examples in your system prompt, your agent has a concrete reference point for tone, vocabulary, sentence length, and level of warmth. It doesn’t have to interpret vague adjectives; it has something to match.
How to Write the Examples
Format each example as a short dialogue in your system prompt. Label them clearly so the model understands they’re demonstrations, not real history. Something like: “Here are examples of how you should respond: Student: ‘I can’t figure out where to start with the first module.’ You: ‘Start with the welcome video at the top of the course — it’s only 8 minutes and it’ll orient you to everything. Once you’ve watched it, the first real lesson will make a lot more sense.'” That example communicates more about your voice than any description could.
Write examples that cover the situations your agent will encounter most often: a confused student, a frustrated student, a student asking for a recommendation. Three to five examples across different emotional tones gives the model a full picture of how you respond to different situations.
What This Means for Educators
Your voice is part of your brand. When students feel like they’re hearing from you — not a generic AI assistant — trust increases and engagement follows. Examples in your system prompt are the fastest way to close the gap between “AI response” and “James would say this.” Pull real examples from your own emails, community posts, or session transcripts for the most authentic results.
The Simple Rule
Two great examples beat two paragraphs of voice description every time. Write the student question, write your ideal answer, drop it into your system prompt. Repeat two to four times. Your agent’s voice will match yours within the first message.