A system prompt is a high-priority instruction layer that sets role, style, and constraints for a conversational model session.
AI Glossary
System Prompt
Coverage in development
A system prompt is a high-priority instruction layer that sets role, style, and constraints for a conversational model session.
Definition
Plain English explanation
It is the behind-the-scenes brief that tells the assistant how to behave before the user starts chatting.
Related glossary terms
Last reviewed
Sources
- NIST AI Risk Management Framework — risk vocabulary context for AI systems
- Brel Digital company and technology profiles — applied usage evidence where tagged
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