tox-uv-bare
Integration of uv with tox (bare package, bring your own uv).
Decision gist · record as of 2026-08-14
Yes, if you already have uv installed and want faster tox test runs. The bare package is the right choice for containerized environments. No friction on install, active maintenance, no known vulnerabilities, and permissive MIT license. The main trade-off is that you inherit both uv's performance gains and any bugs—verify uv compatibility with your project first.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires uv to be installed separately in your system or container; tox-uv-bare does not bundle it.
- Low install friction; pure Python wheel with four runtime dependencies (packaging, tomli, tox, typing-extensions).
- Active maintenance with a release 24 days ago and 351 repository stars.
License · maintenance · safety
MIT (permissive) — MIT license permits commercial and private use with minimal restrictions—suitable for most projects.
last release 2026-07-21 (24 days) · last repo commit 2026-08-10 · 351 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 5,677,061 downloads/mo, #2,055 on PyPI
Alternatives
Verify before relying
pip install tox tox-uv-bare
# In tox.ini:
# [testenv]
# runner = uv-venv-runner
# commands = pytest
tox r -e py312- Whether performance gains from uv over virtualenv+pip are measurable for typical test suites.
- Compatibility matrix with specific uv versions and whether version mismatches cause silent failures.
What it is and what it does
tox-uv-bare is a plugin that integrates the uv package manager into tox's test environment lifecycle. Instead of using virtualenv to create isolated environments and pip to install dependencies, tox-uv-bare delegates both tasks to uv, which is significantly faster. The plugin provides new runner types (uv-venv-runner, uv-venv-lock-runner, uv-venv-pep-723) that you specify in your tox configuration to opt into uv-based environments.
This bare variant assumes you already have uv installed in your system or container—it does not bundle a uv binary. It's designed for containerized deployments (Docker, Kubernetes) where uv is pre-installed, avoiding duplicate binary downloads. You configure it by setting runner = uv-venv-runner (or the lock-file variant) in your tox.ini, and tox discovers uv via TOX_UV_PATH environment variable, bundled binary (if using the non-bare package), or system PATH.
Use it for
- Speed up CI/CD pipelines by replacing pip with uv's faster resolver in tox test environments.
- Use uv.lock files in tox to pin exact dependency versions across test runs for reproducibility.
- Deploy tox in Docker containers where uv is already installed, avoiding redundant binary bundling.
- Run PEP 723 inline script metadata through tox with uv as the backend instead of virtualenv.
- Manage multiple Python versions and dependency groups in tox using uv's dependency group support.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you already have uv installed and want faster tox test runs.
The bare package is the right choice for containerized environments. No friction on install, active maintenance, no known vulnerabilities, and permissive MIT license. The main trade-off is that you inherit both uv's performance gains and any bugs—verify uv compatibility with your project first.
Install
tox-uv-bare on PyPI
Before you install
Low install friction; pure Python wheel with four runtime dependencies (packaging, tomli, tox, typing-extensions). Active maintenance with a release 24 days ago and 351 repository stars.
Requires uv to be installed separately in your system or container; tox-uv-bare does not bundle it.
License in practice
MIT license permits commercial and private use with minimal restrictions—suitable for most projects.
Quickstart
pip install tox tox-uv-bare
# In tox.ini:
# [testenv]
# runner = uv-venv-runner
# commands = pytest
tox r -e py312Verify before relying
- Whether performance gains from uv over virtualenv+pip are measurable for typical test suites.
- Compatibility matrix with specific uv versions and whether version mismatches cause silent failures.
Package facts
| License | MIT permissive |
| Python support | Supports the current Python release >=3.10 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 4 packagespackagingtomlitoxtyping-extensions |
| Maintenance | Actively maintained 24 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 5,677,061 / month, #2,055 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 5 - Production/StableIntended Audience :: DevelopersOperating System :: OS IndependentProgramming Language :: PythonProgramming Language :: Python :: 3 :: OnlyProgramming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.14Programming Language :: Python :: 3.15Topic :: InternetTopic :: Software Development :: LibrariesTopic :: System |
Evidence: tox_uv_bare-1.36.0-py3-none-any.whl
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See also tox-uv · tox · nox-uv · tox-docker · tox-gh-actions · tox-gh · hadolint-coatl · virtualenv · ansible-dev-environment · pytest-env