git:20260523.24bd6eb to git:20260729.45c66fd
1 added, 1 removed. Audit A to A.
---
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.
+ **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