$ cd /tmp/agentskills/skills-ref && python3 -m venv .venv && pip install -e . 2>&1 | tail -3
(A "pyproject.toml" file was found, but editable mode currently requires a setuptools-based build.)
WARNING: You are using pip version 21.2.4; however, version 26.0.1 is available.
You should consider upgrading via the '/private/tmp/agentskills/skills-ref/.venv/bin/python3 -m pip install --upgrade pip' command.