Master System Prompt
A single coherent prompt that encodes a business's identity, voice, products, and constraints.
The master system prompt is the brain of an AI Operating System. It gets pasted ONCE into Claude Projects / ChatGPT Custom Instructions / Gemini Workspace, and every subsequent conversation reads it as context. Well-engineered master prompts are 800-2,500 tokens long and explicitly cover identity, audience, products, voice, constraints, and forbidden patterns.
Related terms
- AI Operating System — A complete strategy + prompt library that turns a generic AI model into a custom business operator.
- Claude Project File — A pinned context file in Anthropic Claude Projects that every chat in the project references.
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