name: Validate Skills

on:
  push:
    branches: [main]
    paths: ['skills/**']
  pull_request:
    paths: ['skills/**']

permissions:
  contents: read

concurrency:
  group: skills-${{ github.ref }}
  cancel-in-progress: true

jobs:
  validate:
    name: Validate SKILL.md
    runs-on: ubuntu-24.04
    timeout-minutes: 5
    steps:
      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
        with:
          persist-credentials: false

      - name: Lint Markdown
        uses: DavidAnson/markdownlint-cli2-action@ce4853d43830c74c1753b39f3cf40f71c2031eb9 # v23.0.0
        with:
          globs: 'skills/**/*.md'

      - name: Validate frontmatter and size
        run: |
          for skill_dir in skills/*/; do
            skill_file="${skill_dir}SKILL.md"
            if [ ! -f "$skill_file" ]; then
              echo "::error::Missing SKILL.md in ${skill_dir}"
              exit 1
            fi
            if ! head -20 "$skill_file" | grep -q '^name:'; then
              echo "::error::${skill_file} missing 'name' in frontmatter"
              exit 1
            fi
            if ! head -20 "$skill_file" | grep -q '^description:'; then
              echo "::error::${skill_file} missing 'description' in frontmatter"
              exit 1
            fi
            lines=$(wc -l < "$skill_file")
            echo "${skill_file}: ${lines} lines"
            if [ "$lines" -gt 500 ]; then
              echo "::error::${skill_file} exceeds 500 lines (${lines})"
              exit 1
            fi
          done