Individual skill

contract-driven

Use when crossing a public API boundary, guarding complex invariants, or hardening untrusted input or integration seams. Not for remote or irreversible changes.

.devin/skills/contract-driven/SKILL.md

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# Contract-driven

## Contract

| Field | Bound contract |
|---|---|
| Trigger | Crossing a public API boundary, guarding complex invariants, or hardening untrusted input or integration seams. |
| Authority | Reversible local: writes only named local types, assertions, validators, and tests at contract boundaries; rollback is undo (delete the added code or revert the boundary change). No remote mutation. |
| Side effect | Adds or refines local types, assertions, validators, and tests at contract boundaries. |
| Done | Every planned contract is implemented at the appropriate static/test/debug/runtime layer and violations fail explicitly at the boundary. |

## Inputs

Required: