The hook reads staged .cs file names from git diff --cached --name-only and appends them to INCLUDE_ARGS. While each filename is passed as a separate array element (avoiding shell word-splitting), filenames containing spaces, glob characters, or leading dashes are forwarded directly to dotnet format --include. A maliciously crafted filename (e.g., starting with --) staged in a feature branch could be interpreted as an option to dotnet format, potentially altering behavior. There is no -- separator before the file list to disambiguate.

The script uses set -e at the top, but the dotnet format ... || { ... } construct disables errexit for that command, and the surrounding $(...) capture also suppresses errors from the pipeline inside the process substitution. If git diff --cached or grep fails, the trailing || true masks it, which could lead to silently running dotnet format with zero include args (handled) but also masks genuine git failures. Low-severity hardening concern.