A system prompt provides the foundational personality, behavioral constraints, and grounding rules that govern how an AI assistant interacts with users.
A system prompt is a high-priority directive passed to an LLM before conversation turns, establishing the assistant’s persona, boundary rules, and grounding constraints.
The system prompt establishes the non-negotiable rules of the assistant: e.g., “You are a customer support assistant for Acme Corp. Answer ONLY using provided context. Never invent prices.”
Structuring system prompts with XML delimiters prevents adversarial user messages from overriding core instructions.
SiteMind uses a battle-tested system prompt architecture that enforces strict factual grounding, citation formatting, and safe refusal behavior across every chat session.
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Related Technical Concepts
Prompt Injection & Jailbreaking
Prompt injection is an adversarial attack where malicious user inputs attempt to override system instructions and hijack the AI’s behavior.
LLM Output Guardrails & Validation
Guardrails are programmable security rules that validate, filter, and sanitize both incoming prompts and outgoing AI responses before they reach the user.
Source Grounding & Citations
Source grounding ensures every AI claim is directly supported by retrieved website text and includes clickable citations for instant human verification.
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