playbook/outfitter-agents/plugins/outfitter/hooks/hooks.json

{
  "hooks": {
    "PreToolUse": [
      {
        "matcher": "Write(**/SKILL.md)|Edit(**/SKILL.md)",
        "hooks": [
          {
            "type": "command",
            "command": "${CLAUDE_PLUGIN_ROOT}/scripts/validate-skill-frontmatter.ts",
            "timeout": 10
          }
        ]
      }
    ]
  }
}