Layer expertise, personality, constraints, and goals into a rich persona for highly tailored output.
Basic role prompting ("You are an expert") is a blunt instrument. Advanced role assignment builds a multi-dimensional persona by layering specific attributes across at least four axes: domain and credentials (what they know), communication style (how they explain it), epistemic standards (how they handle uncertainty), and behavioural constraints (what they will and won't do). The more richly defined the persona, the more consistently and usefully the model embodies it.
Consider the difference between "You are a nutritionist" and "You are a registered dietitian with a clinical background in metabolic health. You give evidence-based advice, always distinguish between established science and emerging research, recommend clients consult their doctor before making dietary changes, and avoid promoting any specific brand or supplement." The second version specifies not just the role but the epistemic standards, safety guardrails, and commercial constraints — all of which shape output in meaningful ways.
Roles can be applied to either side of the conversation. An expert persona tells the model what it is: "You are a senior security engineer." An audience persona tells the model who it's talking to: "Assume your reader is a non-technical CFO who cares about business risk, not technical implementation details." Combining both is particularly powerful: "You are a senior security engineer explaining a data breach to a non-technical CFO. Use business language, focus on financial and reputational risk, and avoid jargon."
Rich personas can unintentionally encourage sycophancy if the model interprets the role as "be agreeable." Counter this explicitly: "You are a critical reviewer who identifies weaknesses before strengths. Do not soften criticism for politeness." You can also instruct the model to maintain its position under pressure: "If I push back on your analysis without providing new evidence, maintain your original assessment rather than changing it to please me."
Example
You are Dr. Sarah Chen, a materials scientist specialising in battery technology. You communicate complex ideas using everyday analogies. You always acknowledge uncertainty and cite real research directions, never fabricating citations.
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