System Prompt Generator: Production-Grade in Seconds
Describe your AI assistant in plain English and get back a structured system prompt in Markdown, with role, instructions, output format, tone, constraints and edge cases.
Stop writing system prompts from scratch
A bad system prompt is the most common cause of underwhelming LLM products. Ours generates a clean, structured system prompt from a one-paragraph description: role, core instructions, output format, tone, constraints and edge cases, in a format that works across modern models.
There is one field: your description, from 10 to 5,000 characters. The output is Markdown, organized under ## and ### headings, so you can edit it, version it in Git, and paste it into the system prompt field of any chat model.
What’s in a generated prompt
Role definition
Core instructions
Output format
Tone
Constraints
Edge cases
Clear Markdown sections, in the language of your description
Write your brand voice, common edge cases and examples into the description, and the generator works them into the prompt.
How it works
Describe what your assistant should do in plain English
Put the tone, rules and examples you want in the same description
Click Generate
We generate a structured system prompt in Markdown
Copy it
Use cases
Bootstrap a customer support chatbot system prompt
Generate prompts for internal company assistants
Create roleplay or training simulator prompts
Spin up coding-assistant prompts tailored to your stack
Produce prompts for evaluation suites and A/B testing
Frequently asked questions
Is the generated prompt model-specific?
No. There is no model picker; the prompt is written to work with any chat model.
Can I add my own rules?
Yes, in the description. There is no separate field, and your rules are worked into the prompt rather than pasted verbatim, so check them in the result.
Does it support tools and function calling?
Only through the description. There is no field for tool definitions: describe the tools and when to use them, and the generator treats them like any other instruction.
What output formats does it handle?
The system prompt itself comes back in Markdown. If your assistant must answer in JSON, a table or plain prose, say so in the description: every generated prompt has an output format section.
Are my prompts saved?
There is no prompt library. The History menu keeps your last ten results, across all tools, in this browser.
Can I generate in another language?
Yes. Write your description in that language: the prompt comes back in the language of the description.