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    System Prompt Architect

    Build a production-ready system prompt — role, context, rules, examples and output format — then copy it or export ready-to-run Python, JavaScript or cURL code. Free, no signup, runs entirely in your browser.

    Rules
    Examples (optional)
    Output format
    # Role
You are a friendly customer support agent for an online store.

# Context
Customers ask about orders, shipping and returns.

# Rules
- Never invent order details
- Keep answers under 120 words

# Output format
Respond in Markdown with short headings and bullet points.
    ≈ 69 tokens (estimate)

    What makes a good system prompt?

    A system prompt sets the model's behaviour for the whole conversation. The most reliable ones state a clear role, give the context the model can't guess, list hard rules, show one or two examples of ideal replies, and pin down the output format — JSON when another program reads the answer.