Glossary · AI & Development
System Prompt
The hidden instructions sent to a language model before any user input, defining its role, rules and behaviour.
Browse all definitionsIn detail
The system prompt is the instruction set the developer sends to the model to define its persona, constraints, output format and rules. It runs ahead of any user message, and most models treat it as more authoritative than user input. A typical system prompt for a customer service agent might cover the assistant's name, the tone, the products it knows about, what it must never do (give financial advice, share competitor info) and the structured output schema for handoffs.
Apply the definition
Want to talk through how this applies to your business?
Start with the decision in front of you. We will help map the fit.
Straight answers · no pitch deck · no commitment