Validation

The Validator is the gate every .po9-skin passes before it runs. The same checks run in the CLI and in the app.

What it checks

• Security — no executable code, no network calls, assets stay within declared limits and types.
• Compatibility — the skin’s declared spec version is supported by the target.
• Structure — required files and folders exist and are well-formed (see Folder Structure).
• Version — the manifest version and spec version are present and valid (see Versioning).

Run it

po9 validate ./my-skin

A clean run exits 0. Any failure prints the rule, the file, and a fix hint, and exits non-zero — so it drops straight into CI.

Severity

• Error — the skin is invalid and will not load. Must fix.
• Warning — allowed, but discouraged (e.g. an oversized asset).