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spec-driven-implementation

Use when a feature begins or specs are checked in: author or update behavioral specs and keep them current with what ships. Not for producing the initial approved spec and plan: use spec-driven.

.devin/skills/spec-driven-implementation/SKILL.md

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# Spec driven implementation

## Contract

| Field | Bound contract |
|---|---|
| Trigger | Starting a significant feature or when specs are checked in. |
| Authority | Reversible local: writes only checked-in spec files and implementation; rollback is version control (if commit is not yet pushed). No remote mutation. |
| Side effect | Creates or updates checked-in spec files within the project. |
| Done | Specs exist, are behavioral, and stay current with what ships. |

## Inputs

- Feature brief (required): natural-language description of the feature to implement.