Expert instruction design focuses on crafting system prompts that define how an AI agent behaves, what it can and cannot do, and how it responds across interactions. Unlike general prompt engineering (which optimizes individual queries), this skill covers the persistent behavioral layer that shapes an agent's identity, capabilities, and constraints.
When to use: Writing system prompts for AI products, defining agent personas for customer-facing tools, specifying behavioral guardrails, crafting tool-use guidance, or designing multi-step agent workflows.
When NOT to use: One-off prompt optimization (use the prompt skill), fine-tuning or training-time configuration, infrastructure-level safety (use model provider safety features), or tasks that do not involve LLM agent behavior.
System prompt design and instruction crafting for AI agents. Covers persona definition, constraint specification, output formatting, tool use instructions, multi-turn behavior, and guardrail design. Use when writing system prompts for AI products, designing agent personas, specifying behavioral constraints, crafting tool-use instructions, or building multi-step agent workflows. Source: oakoss/agent-skills.