This repository is a lightweight PHP CLI tool that converts ad-blocking filter lists (primarily from AdGuard's CNAME tracker research and EasyPrivacy) into HOSTS-format blocklists. The core script, converter.php, fetches upstream lists from hardcoded URLs, parses domain entries, and outputs files containing '0.0.0.0 <domain>' lines. The generated .txt files (e.g., AdguardMobileAds.txt, EasyPrivacy3rdParty.txt) are committed to the repository and meant to be consumed by HOSTS-file-based ad blockers on mobile devices. The architecture is intentionally minimal: a single PHP script handles conversion, a shell script (.check.sh) automates periodic updates by committing only when the diff is exactly one line, and a GitHub Actions workflow (php.yml) runs the converter on a schedule. The tool is designed for manual or scheduled regeneration, not as a live service. It relies on upstream AdGuard lists, which introduces a maintenance risk if those sources change format or disappear. The repository is a hybrid of application code and generated data artifacts, but the dominant character is a small utility application. The converter is generic enough to accept custom list names and URLs, making it reusable for other filter-list-to-hosts conversions. However, the conversion is lossy—many filter options (e.g., $domain, $third-party, $redirect) are ignored—and there are no tests or CI validation for the converter logic. The project is functional for its niche but shows signs of technical drift and brittle upstream coupling.