Configuration files should follow official standards, have up-to-date tool settings, and appropriate dependency constraints. This ensures consistent behavior across environments and compatibility with the project's requirements. For pyproject.toml: 1. Organize sections according to packaging specifications (e.g., place dependency-groups under the project section) 2. Keep tool configuration versions aligned with project requirements: ```toml [tool.ruff] target-version = 'py39' # Should match minimum supported Python version ``` 3. Manage dependency constraints carefully, considering Python version compatibility: ```toml # Option 1: Version constraints with conditions "sqlalchemy>=2.0,<3.0; python_version < '3.13'" # Option 2: Simpler constraints when appropriate "sqlalchemy>=2.0,<3.0" ``` Regular audits of configuration files should be performed when upgrading dependencies or changing supported Python versions to ensure configurations remain correct and optimal.