Macha
AI Support & Agents

System Prompt

Definición

A system prompt is the underlying set of instructions that defines an AI model's role, behavior, tone, and boundaries for a conversation — set by the developer, not the end user, and applied to every interaction.

También conocido como: system messagesystem instruction

How it works

The system prompt is provided to the model before the user's messages and establishes the ground rules: who the agent is, what it should and shouldn't do, how it should sound, and when it should escalate. The model treats it as higher-priority guidance than ordinary user input.

In an AI support platform, the system prompt is where much of the agent's persona, scope, and escalation logic lives — often generated from the plain-English configuration a team sets up.

Why it matters for support

The system prompt is the main lever for keeping an AI agent on-brand, on-policy, and in-scope across every conversation. A well-written one enforces tone, prevents the agent from answering outside its remit, and defines when to hand off to a human.

Preguntas frecuentes

What is the difference between a system prompt and a user prompt?

A system prompt is set by the developer to define the agent's role and rules for the whole conversation; a user prompt is the individual message a person sends. The system prompt is treated as authoritative over user input.

Can users see or change the system prompt?

End users normally can't see or change it — that separation is what keeps the agent's behavior consistent and helps defend against prompt injection.

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