Conversational AI and agent platform combining LLM reasoning with deterministic business logic
Full evaluationGlossary · Updated Sep 2, 2026
System prompt
Hidden instructions set by a product or developer that define an assistant's role, rules, tone, and constraints.
Definition
A system prompt sits above user messages and shapes every response: what the assistant can discuss, how it formats answers, which tools it may use, and how it should refuse. Products expose parts of this through custom instructions, personas, or agent settings. Well-designed system prompts are a major part of product quality.
Why it matters when choosing a tool
When a tool lets you set custom instructions or build agents, you are effectively editing the system prompt, which is where consistency and safety live.
Where you will meet it
AI Agent & Chatbot Builders, AI Customer Support, AI Assistants
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