Browse Custom GPTs Section 2: System Prompt Engineering

Core System Prompt Template

10 fill-in slots · from The AI Prompt Handbook for Custom GPTs

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Core System Prompt Template

Write a system prompt for a Custom GPT with these specifications:

GPT PURPOSE:
[What it does]

TARGET USERS:
[Who uses it]

KEY BEHAVIORS:
[List 3-5 main things it should do]

PERSONALITY:
[How it should communicate]

Generate a system prompt following this structure:

## Identity
[Who is this GPT? 1-2 sentences]

## Purpose
[What does it do? What problem does it solve?]

## Behavior Rules
[Numbered list of specific behavioral instructions]

## Response Format
[How outputs should be structured]

## Limitations
[What the GPT should NOT do]

## Error Handling
[How to respond to edge cases or unclear requests]

Keep it under 1500 words. Shorter prompts often work better.

Highlighted [slots] are still empty. Downloads are plain .txt — paste into any AI assistant.