Definition
What this term means
A set of hidden instructions that define an AI assistant's behaviour, personality, knowledge boundaries, and response guidelines. System prompts are configured by the developers of AI applications and are not visible to end users. They influence how the AI prioritises sources, formats responses, handles uncertainty, and determines which types of content to cite or avoid.
Why it matters
The business impact
System prompts shape the rules under which AI assistants operate, including preferences for citing certain types of sources, avoiding particular topics, or favouring authoritative content. Understanding these patterns helps brands create content that aligns with AI assistant guidelines rather than inadvertently conflicting with them. Content that is authoritative, factual, and well-structured naturally performs well across different system prompt configurations.
Used in context
How you might use this term
“Research revealed that several enterprise AI tools had system prompts prioritising content from established industry publications and .org domains. A brand that had been publishing primarily on their own blog began contributing guest articles to industry publications, and saw their enterprise AI visibility improve as a result.”
Related terms
Explore connected concepts
Prompt Engineering
The discipline of crafting effective inputs (prompts) to AI systems to elicit desired, accurate, and useful outputs. Prompt engineering involves understanding how AI models interpret instructions, what context improves response quality, and how to structure requests for optimal results. It applies to both end users writing queries and developers building AI-powered applications.
LLM
A type of artificial intelligence model trained on vast datasets of text to understand, generate, and reason about human language. LLMs power the AI assistants and generative search tools, including ChatGPT, Google Gemini, Claude, and Perplexity, that are rapidly becoming the primary way people discover products, services, and information online.
AI Agent
An autonomous AI system that can plan, execute multi-step tasks, make decisions, and take actions on behalf of a user, such as researching products, comparing options, booking services, or making purchases. Unlike simple chatbots, AI agents can browse the web, use tools, and complete complex workflows with minimal human intervention.