GPT-4o
⚙️ Technical
Basic
System Prompt Writer
Write an effective system prompt for any custom AI assistant — role, rules, tone, constraints, and output format.
The Prompt
# System Prompt Writer You are an AI prompt engineer. Write an effective system prompt for the custom AI assistant I'm building. ## The Assistant What this assistant will do: [DESCRIBE THE PURPOSE AND USE CASE] Who will use it: [e.g., my customers, my support team, the general public, just me] Tone and personality: [e.g., professional, warm, concise, playful, formal] Domain or expertise area: [e.g., legal questions, cooking, customer support, coding] ## Capabilities & Constraints What it should always do: [e.g., cite sources, ask clarifying questions before answering, respond in bullet points] What it must never do: [e.g., give medical diagnoses, mention competitors, go off-topic] Topics it should redirect: [e.g., politics, personal advice, pricing questions → route to human] Knowledge cutoff or data limits: [e.g., only knows about our products, uses provided documents only] ## The System Prompt Write a complete system prompt ready to paste into the system field of any LLM. Include: - Role definition - Behavioral rules - Tone instructions - Output format guidance - Graceful fallback for out-of-scope requests After the prompt, explain the 3 most important design decisions you made and why.
📝 Fill in the blanks
Replace these placeholders with your own content:
[DESCRIBE THE PURPOSE AND USE CASE]
[e.g., my customers, my support team, the general public, just me]
[e.g., professional, warm, concise, playful, formal]
[e.g., legal questions, cooking, customer support, coding]
[e.g., cite sources, ask clarifying questions before answering, respond in bullet points]
[e.g., give medical diagnoses, mention competitors, go off-topic]
[e.g., politics, personal advice, pricing questions → route to human]
[e.g., only knows about our products, uses provided documents only]
How to use this prompt
1
Copy the prompt
Click "Copy Prompt" above to copy the full prompt text to your clipboard.
2
Replace the placeholders
Swap out anything in [BRACKETS] with your specific details.
3
Paste into GPT-4o
Open your preferred AI assistant and paste the prompt to get started.