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design-it-twice

Use when asked to design a module interface, seam, or testable boundary. Not for UI direction picking: use design. No source or remote-system changes.

.devin/skills/design-it-twice/SKILL.md

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Sep 28, 2026
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# Design it twice

## Contract

| Field | Bound contract |
|---|---|
| Trigger | Design a module interface, seam, or testable boundary. |
| Authority | Read-only. No file, VCS, credential, paid, published, deployed, or remote mutation. Design guidance only. |
| Side effect | None. No artifacts are written; output is a design comparison and recommendation in chat. |
| Done | The design uses explicit deep-module vocabulary and deliberately placed seams. |

## Inputs

- A module, cluster, or boundary to design, named by the user or identified from context. Required.