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behavior-validator

Use when asked to validate a web app, CLI, API, or generated artifact against a source-blind behavior contract. Not for source or remote-system changes.

.devin/skills/behavior-validator/SKILL.md

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Sep 28, 2026
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Apache-2.0

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# Behavior validator

## Contract

| Field | Bound contract |
|---|---|
| Trigger | User needs a code-review-agnostic skill to validate a web app, CLI, API, or generated artifact against a source-blind behavior contract, or as a black-box companion to a code-aware review |
| Authority | Read-only. No file, VCS, credential, paid, published, deployed, or remote mutation. Reads only the runtime output of the target; never reads source code, repository state, or build internals |
| Side effect | Produces a structured behavior validation report. No mutation of the target, source, or workspace beyond emitting the report |
| Done | Every contract clause has an observable result; the report correctly reflects real-time behavior and no implementation evidence contaminated the validation |

## Inputs

- A behavior contract: a list of clauses, each with an identifier, a stimulus, and an expected observable outcome. Must be supplied.