Role Prompting

Definition

Assigning Claude a role in the system prompt focuses its behavior and tone; even a single sentence measurably shifts responses.

Key points

• Set the role in the system prompt, not the user turn (e.g. system: "You are a helpful coding assistant specializing in Python.").
• A single sentence is enough to make a difference — role prompting is low-cost.
• Complements Prompt Clarity And Motivation: role sets persona/tone; explicit instructions + motivation set the task.

Why it matters for the exam

• Tested as the correct lever for tone/behavior focus, and specifically that the role belongs in the system prompt.

Common gotchas

• Putting the role in the user message instead of the system prompt is weaker / the wrong answer.
• Over-relying on role alone for correctness — pair it with clear instructions and examples.

See also

• Prompt Clarity And Motivation
• XML Structuring
• Few-Shot Prompting

Sources

• docs-prompting
• netlight-study-guide