Private helpers with docstrings were invisible to agents because export-functions.py unconditionally skipped any function starting with _. This meant reusable utilities like _get_current_python_version() were absent from docs/functions.txt and therefore from the Function Reference in AGENTS.md.

Changes

• hooks/export-functions.py: Adds --skip-private flag (default: off). Without the flag, all functions with docstrings — public and private — are exported. --strict only enforces docstrings on public functions; private functions without docstrings are silently omitted.
• docs/functions.txt: Regenerated — ~37 additional private helpers now included.
• AGENTS.md: Sync block updated with the new entries.
• src/usethis/_file/yaml/update.py: Fixed __eq__ → `__eq__` in docstring to prevent a prettier ↔ fix-doc-sync formatting cycle.
• tests/hooks/test_export_functions.py: 20 new tests covering the public/private inclusion logic, --skip-private, --strict behaviour, and edge cases.

Example

# Default: export everything with a docstring
uv run hooks/export-functions.py --source-root=src/usethis --output-file=docs/functions.txt

# Old behaviour: skip private functions
uv run hooks/export-functions.py --source-root=src/usethis --output-file=docs/functions.txt --skip-private