
The correct answer is instructions because an agent’s persona—such as being warm, friendly, formal, or analytical—is defined through its behavioral and communication guidance. In Microsoft 365 Copilot, the Instructions field controls how the agent responds, including tone, style, personality, response structure, and interaction patterns.
The description typically explains what the agent does, not how it communicates. Capabilities define what tasks the agent can perform, such as summarizing documents or analyzing data. Suggested prompts provide example user queries but do not control the agent’s personality or communication style.
To establish a warm and friendly persona, the instructions should explicitly state guidance such as: “Respond in a supportive, conversational tone. Use clear and positive language. Be encouraging and approachable.” This ensures consistent tone across all interactions.
Defining persona through instructions reflects prompt engineering best practices in generative AI, enabling predictable behavior, improved user experience, and alignment with organizational communication standards within Microsoft 365 Copilot environments.