Non-CLI functions were accepting usethis_config attributes (e.g. backend, offline) as parameters and threading them through call chains. This should be documented as an anti-pattern in agent skills so future code generation avoids it.

• Added a new section to usethis-python-functions/SKILL.md documenting that non-CLI functions must access usethis_config directly rather than accepting its attributes as parameters
• Only CLI interface functions (_ui/interface/) should accept these parameters, to bridge the CLI framework into usethis_config.set()

# Bad: pass-through pattern
def register_group(name: str, *, backend: BackendEnum) -> None:
    if backend is BackendEnum.uv:
        ...

# Good: access global config directly
def register_group(name: str) -> None:
    if get_backend() is BackendEnum.uv:
        ...

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