Configure shell scripts with defensive practices to ensure reliability and debuggability. Use appropriate `set` options for error handling and debugging, implement safe defaults that require explicit opt-in for risky operations, and preserve execution state when changing directories. Key practices: - Use `set -ex` instead of just `set -e` to output commands as they execute for better debugging - Default to safe behaviors and require explicit conditions for potentially risky operations (e.g., defaulting to dev releases and opting into stable releases only on exact matches) - Preserve directory state using `pushd`/`popd` instead of `cd` when temporary directory changes are needed - Document supported configuration values and their behaviors clearly Example of defensive directory handling: ```bash # Instead of: cd "${PROJECT_PATH}" pipenv install # Use: pushd "${PROJECT_PATH}" pipenv install popd ``` This approach prevents unintended side effects on subsequent script execution and makes scripts more predictable in different environments.