version: "1.0.1" name: principle-exhaust-the-design-space description: "Apply when facing a novel UI interaction or architectural decision with no precedent in the codebase. Build 2-3 competing prototypes and compare side by side before committing." disable-model-invocation: true

Exhaust the Design Space

When a novel interaction or architectural decision has no established precedent, explore several concrete alternatives before implementation. Building the wrong thing costs more than exploring three options.

The rule. When the right answer is not obvious, build 2-3 competing prototypes or sketches. Compare them side by side. Only then commit. Design it twice is this rule by another name. A second flavor of the first shape does not count.

When it applies:

• Novel UI interactions (no prior art in the codebase)
• Architectural choices with multiple viable approaches
• Product design decisions where user experience depends on feel, not logic

When it doesn't:

• Mechanical implementation where the pattern is established
• Bug fixes or refactors with a clear target state
• Changes where constraints dictate a single viable approach