Use when a ticket adds or changes shell scripts — bash automation, CI steps, install or release scripts, git hooks, Makefile recipes — and they must follow the Google Shell Style Guide, be safe under set -euo pipefail (knowing its caveats), quote every expansion, clean up temp files and locks, stay portable across GNU and BSD/macOS tools, and be clean under shellcheck. Invoke for "write a script that…", "fix the bash", "this only works on Linux", or as the language pack for any .sh change or shell review.
