SG-015: Unusual Metadata

Severity: LOW

YAML fields not in the standard schema

Fires when

• A skill file's metadata contains top-level YAML fields that are not in the standard skill-schema allowlist.
• Fires only on skill files - general settings.json / manifest configs with arbitrary keys are excluded.

Remediation

No safe remediation: a file that triggers this rule should be rejected, not patched. Read the flagged lines in the source before deciding.