What Are System Prompts?
A system prompt is the invisible instruction set that defines who Claude is and how it behaves for a given conversation. It's like hiring an expert and briefing them before they start work. A great system prompt has five key components: Identity, Constraints, Format, Tone, and Examples.
Build Your System Prompt
Click blocks from the palette to add them to your prompt. Arrange the components to create the perfect system prompt.
Available Blocks
Identity
Senior Software Engineer
Identity
Writing Tutor
Constraints
Safety Guardrails
Constraints
Concise Responses
Format
Structured Response
Format
Markdown Output
Tone
Warm & Encouraging
Tone
Direct & Technical
Examples
Code Q&A Example
Examples
Writing Review Example
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