System prompt generator
Updated July 2026
Describe the assistant or agent you want and PromptDC turns it into a clear, structured system prompt — with a defined role, behavior rules, constraints, and output format. See the example below. Ideal for custom GPTs, agents, and API apps.
Before and after
a support agent for a SaaS that answers billing questions
You are a billing support assistant for a SaaS product. Role: answer questions about plans, invoices, refunds, and payment methods. Rules: only use the billing facts provided in context; never invent prices; if unsure, ask one clarifying question. Tone: concise, friendly, professional. Format: 2–4 sentences, then a bulleted next step. Refuse: legal, tax, or account-security actions — escalate those to a human.
Plans from $9/mo, or Lifetime from $69 with your own API key.
A strong system prompt sets identity, scope, hard rules, tone, and response format — and says what the assistant should refuse. Vague system prompts produce inconsistent agents. PromptDC generates a complete system prompt, which you can refine from selected text anywhere or directly in an editable field.
Frequently asked questions
What makes a good system prompt?
A clear role, explicit rules and constraints, a defined tone, an output format, and refusal boundaries. PromptDC includes all of these so your agent behaves consistently.
Can I use the output for a custom GPT or agent?
Yes. The generated system prompt works for custom GPTs, Claude projects, API system messages, and agent frameworks.
Is it free?
No — PromptDC is a paid tool. This page shows an example and a structure guide. Generating your own system prompts happens in the PromptDC extension — Pro at $9/mo, Enterprise at $15/mo for higher limits, or a one-time Lifetime plan (from $69) with your own API key and unlimited use.
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