CI/CD Integration

Horn is built for automated pipelines. Use any of the output formats to integrate accessibility checks into your CI/CD workflow.

GitHub Actions

Using the Horn Action

The simplest way to add Horn to GitHub Actions:

steps:
  - uses: actions/checkout@v4
  - uses: focusring/horn@v0
    with:
      path: ./output/
      format: sarif
      fail-on: error

When format: sarif, the action automatically uploads results to GitHub Code Scanning. Accessibility findings appear directly in pull request reviews.

See GitHub Action Reference for all options.

Manual setup

If you need more control:

steps:
  - uses: actions/checkout@v4
  - name: Install Horn
    run: |
      curl -sL https://github.com/focusring/horn/releases/latest/download/horn-linux-x86_64 \
        -o /usr/local/bin/horn && chmod +x /usr/local/bin/horn
  - name: Validate PDFs
    run: horn validate ./docs/ --recurse --format sarif -o results.sarif
  - uses: github/codeql-action/upload-sarif@v3
    if: always()
    with:
      sarif_file: results.sarif

GitLab CI

pdf-accessibility:
  image: rust:latest
  script:
    - cargo install --git https://github.com/focusring/horn.git
    - horn validate ./docs/ --recurse --format junit -o results.xml
  artifacts:
    reports:
      junit: results.xml

JUnit results appear in GitLab's merge request test report widget.

Docker

For environments where installing a binary is not possible:

steps:
  - name: Validate PDFs
    run: |
      docker run --rm -v $(pwd):/data horn \
        validate /data/output/ --recurse --format json

Gradual adoption

Use --fail-on to introduce accessibility checks without blocking existing pipelines:

1. Start with --fail-on error — only block on critical failures
2. Move to --fail-on warning — catch more issues as your team fixes existing ones
3. End with --fail-on info — enforce full compliance