Finalize naming conventions and method signatures for all interfaces

This issue has no description.

The issue body names no files, tests, or entry points, so there is no concrete place to begin in this Python library and command-line application. First inspect the repository's interface definitions and existing method signatures, then identify the maintainers' agreed naming conventions. Done criteria are not specified; the final conventions and signatures would need to be documented before implementation can start.

Written by the indexing model from the issue text.