Prompting & Config
Idea Fencing Guide
Fence your ideas in prompts so Claude builds exactly what you scoped and nothing extra.
Published April 2026
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Idea fencing means defining what something is NOT before defining what it IS. MIT researchers found that ideas fail when they get confused with adjacent, similar ideas, and Claude does the same thing: it defaults to the nearest familiar pattern when your instructions are ambiguous. The fix is drawing a fence.
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